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  • Semi-Rebonded Magnesia Chrome Brick

    Semi-Rebonded Magnesia Chrome Brick

    Introduction:

    Semi-Rebonded Magnesia Chrome Brick (SRMK) represent a significant innovation in refractory materials, specifically designed for high-demand industrial environments. These bricks are crafted from partially fused magnesia chrome sand, offering a unique blend of durability and performance.

     

    Composition and Structure:

    The core mineral composition of Semi-Rebonded Magnesia Chrome Brick (SRMK) includes periclase, spinel, and a trace amount of silicate. This composition results in an opacified particle structure, with well-developed spinel within the periclase crystals. The matrix features a metasomatic turbidite structure, leading to direct bonding between periclase-periclase or periclase-spinel. The silicate phase remains isolated, enhancing the brick’s overall structural integrity.

     

    Manufacturing Process:


    Semi-Rebonded Magnesia Chrome Brick (SRMK) are produced using a conventional process that incorporates fused magnesia chrome materials as particles. This is supplemented with chrome ore and magnesia or sintered synthetic magnesia chrome materials as a fine powder, ensuring a high-quality final product.

     

    Performance Advantages:

    These bricks are characterized by their density, low porosity, and high-temperature strength. Notably, SRMK bricks offer better thermal shock resistance than both Direct Bonded Magnesia Chrome Bricks (DMK) and Rebounded Magnesia Chrome Bricks (RMK). This makes them highly resistant to slag erosion, a critical factor in many industrial processes.

     

    Applications:

    Semi-Rebonded Magnesia Chrome Brick (SRMK) are ideal for use in vulnerable parts of electric steelmaking furnaces, RH and DH vacuum degassing devices, and secondary refining slag lines such as VOD, LF, ASEA-SKF, and AOD. They are also effective in the tuyere area of copper converters, the burning zone of cement rotary kilns, and regenerators of glass furnaces. Their versatility and resilience make them a preferred choice in these demanding environments.

     

    Cost-Effectiveness:

    An added advantage of Semi-Rebonded Magnesia Chrome Brick (SRMK) is their cost-effectiveness compared to RMK bricks of equivalent composition. Their superior thermal shock resistance allows them to replace RMK bricks in certain applications, offering a more economical solution without compromising on quality or performance.

     

    Conclusion:

    Semi-Rebonded Magnesia Chrome Brick (SRMK) stand out as a cost-effective, high-performance option in the realm of refractory materials. Their unique composition, manufacturing process, and application versatility make them a go-to choice for industries requiring robust and reliable furnace linings.

    Semi-Rebonded Magnesia Chrome Brick

    After Impregnation process treatment, the physical and chemical properties of Semi-Rebonded Magnesia-chrome Brick (SRMK) are greatly improved. The porosity will be reduced by 7%, the bulk density will increase by 0.05g/cm3, and the Cold Crushing Strength will increase by about 30MPa. This is an additional procedure.

    Direct Bonded Magnesia Chrome Brick 08 www.osymen.com 1 Semi-Rebonded Magnesia Chrome Brick impregnation process treatment

    %E4%B8%8B%E8%BD%BD We can produce Harbinson Walker International standard Semi-Rebonded Magnesia Chrome Brick

    rhimagnesita We can produce RHI Magnesita standard Semi-Rebonded Magnesia Chrome Brick

    Refrateknik1 We can produce Refratechnik standard Semi-Rebonded Magnesia Chrome Brick

    More+

    Introduction:

    Semi-Rebonded Magnesia Chrome Brick (SRMK) represent a significant innovation in refractory materials, specifically designed for high-demand industrial environments. These bricks are crafted from partially fused magnesia chrome sand, offering a unique blend of durability and performance.

     

    Composition and Structure:

    The core mineral composition of Semi-Rebonded Magnesia Chrome Brick (SRMK) includes periclase, spinel, and a trace amount of silicate. This composition results in an opacified particle structure, with well-developed spinel within the periclase crystals. The matrix features a metasomatic turbidite structure, leading to direct bonding between periclase-periclase or periclase-spinel. The silicate phase remains isolated, enhancing the brick’s overall structural integrity.

     

    Manufacturing Process:


    Semi-Rebonded Magnesia Chrome Brick (SRMK) are produced using a conventional process that incorporates fused magnesia chrome materials as particles. This is supplemented with chrome ore and magnesia or sintered synthetic magnesia chrome materials as a fine powder, ensuring a high-quality final product.

     

    Performance Advantages:

    These bricks are characterized by their density, low porosity, and high-temperature strength. Notably, SRMK bricks offer better thermal shock resistance than both Direct Bonded Magnesia Chrome Bricks (DMK) and Rebounded Magnesia Chrome Bricks (RMK). This makes them highly resistant to slag erosion, a critical factor in many industrial processes.

     

    Applications:

    Semi-Rebonded Magnesia Chrome Brick (SRMK) are ideal for use in vulnerable parts of electric steelmaking furnaces, RH and DH vacuum degassing devices, and secondary refining slag lines such as VOD, LF, ASEA-SKF, and AOD. They are also effective in the tuyere area of copper converters, the burning zone of cement rotary kilns, and regenerators of glass furnaces. Their versatility and resilience make them a preferred choice in these demanding environments.

     

    Cost-Effectiveness:

    An added advantage of Semi-Rebonded Magnesia Chrome Brick (SRMK) is their cost-effectiveness compared to RMK bricks of equivalent composition. Their superior thermal shock resistance allows them to replace RMK bricks in certain applications, offering a more economical solution without compromising on quality or performance.

     

    Conclusion:

    Semi-Rebonded Magnesia Chrome Brick (SRMK) stand out as a cost-effective, high-performance option in the realm of refractory materials. Their unique composition, manufacturing process, and application versatility make them a go-to choice for industries requiring robust and reliable furnace linings.

    Semi-Rebonded Magnesia Chrome Brick

    After Impregnation process treatment, the physical and chemical properties of Semi-Rebonded Magnesia-chrome Brick (SRMK) are greatly improved. The porosity will be reduced by 7%, the bulk density will increase by 0.05g/cm3, and the Cold Crushing Strength will increase by about 30MPa. This is an additional procedure.

    Direct Bonded Magnesia Chrome Brick 08 www.osymen.com 1 Semi-Rebonded Magnesia Chrome Brick impregnation process treatment

    %E4%B8%8B%E8%BD%BD We can produce Harbinson Walker International standard Semi-Rebonded Magnesia Chrome Brick

    rhimagnesita We can produce RHI Magnesita standard Semi-Rebonded Magnesia Chrome Brick

    Refrateknik1 We can produce Refratechnik standard Semi-Rebonded Magnesia Chrome Brick

    OSYMEN

    MgO

    SiO2

    Cr2O3

    A.P

    B.D

    C.C.S

    R.U.L

    T.S.R

    1100 oC Water

    %

    %

    %

    %

    g/cm3

    MPa

    (Ta)oC

    Cycles

    SRMK-12A-DA

    72.0

    1.2

    12-14

    14.0

    3.20

    80

    >1700

    5

    SRMK-12A

    72.0

    1.2

    12-14

    16.0

    3.15

    50

    >1700

    5

    SRMK-12B

    70.0

    1.7

    12-14

    16.0

    3.10

    45

    >1700

    6

    SRMK-16A-DA

    62.0

    1.2

    16-18

    14.0

    3.20

    80

    >1700

    5

    SRMK-16A

    62.0

    1.2

    16-18

    16.0

    3.15

    50

    >1700

    5

    SRMK-16B

    60.0

    1.7

    16-18

    17.0

    3.12

    45

    >1700

    6

    SRMK-20A-DA

    58.0

    1.2

    20-22

    14.0

    3.25

    75

    >1700

    5

    SRMK-20A

    58.0

    1.2

    20-22

    16.0

    3.18

    45

    >1700

    5

    SRMK-20B

    55.0

    1.7

    20-22

    16.0

    3.15

    40

    >1700

    6

    SRMK-22-DA

    55.0

    1.5

    22-24

    14.0

    3.25

    75

    >1700

    5

    SRMK-22

    55.0

    1.5

    22-24

    16.0

    3.18

    45

    >1700

    5

    SRMK-24-DA

    53.0

    1.5

    24-26

    14.0

    3.25

    75

    >1700

    5

    SRMK-24

    53.0

    1.5

    24-26

    16.0

    3.20

    45

    >1700

    5

    SRMK-26-DA

    50.0

    1.5

    26-28

    14.0

    3.25

    75

    >1700

    5

    SRMK-26

    50.0

    1.5

    26-28

    16.0

    3.20

    45

    >1700

    5

    AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

    Close
  • Rebounded Fused Magnesia Chrome Brick (RMK)

    Rebounded Fused Magnesia Chrome Brick (RMK)

    Rebounded Fused Magnesia Chrome Brick (RMK) has been developed that contain fused magnesia chrome grain to offer improved slag resistance. Fused grain is made by melting dead burned magnesite and chrome ore in an electric arc furnace. The melted material is then poured from the furnace into ingots and allowed to cool. The resulting ingots are crushed and graded into grain for brickmaking.

    Brick made from this grain, are called “rebounded fused magnesia chrome brick”.

    Fused magnesia chrome grain has extremely low porosity and is chemically inert. In addition, brick made from this grain have a tendency to shrink on burning rather than expand, as is characteristic of many Direct-Bonded Magnesite-Chrome Brick.

    As a result of these features, the rebounded fused magnesia chrome brick has lower porosity and superior slag resistance as compared to direct-bonded magnesia chrome brick.

     

    Rebounded Fused Magnesia Chrome Brick (RMK) made of fused mag-chrome, magnesite and chromite; processed by ultra-high temperature firing. With properties of very good thermal shock stability, oxidation-reduction resistance, thermal fatigue resistance, wear resistance and erosion resistance. Especially with ultra-strong resistance to slag attack and vacuum damage. Under vacuum refining condition, or strong oxidation atmosphere, or ultra-high temperature liquid erosion, or high alkaline slag and frequent alkalinity changes slag attacks. They are proved to be the irreplaceable, the longest service life and the most economical furnace lining refractories. There-fore they are widely used in the vacuum refining furnaces (e.g. RH degasser, VOD degassing ladles), Argon Oxygen Refining Furnaces (e.g. AOD Converters), ultra-high power EAF furnace, non-ferrous smelting big furnaces (IC3 Refining Converters, Pierce Smith Converters, Noranda Furnaces, Outokumpu Flash Smelting Furnaces), or used at key parts of refining furnaces under very harsh conditions, e.g. Working linings, hot spots, slag line zone, tuyere zone, erosion zone and easily damaged parts of big furnaces. (DA means Impregnation process)

     

    Introduction:

    Rebounded Fused Magnesia Chrome Brick (RMK) represent a significant advancement in refractory materials, offering unparalleled performance in industrial furnaces. These bricks are engineered with fused magnesia chrome grain, which provides exceptional slag resistance, a critical property for maintaining furnace integrity and efficiency.

     

    Manufacturing Process:

    The Rebounded Fused Magnesia Chrome Bricks (RMK) are crafted using a specialized process that begins with melting dead burned magnesite and chrome ore in an electric arc furnace. This fusion creates a robust material with significantly reduced porosity and high chemical inertness. Once the material is melted, it’s cast into ingots and allowed to cool. These ingots are then crushed and graded, forming the grain essential for RMK brickmaking.

     

    Performance Advantages:

    One of the key features of Rebounded Fused Magnesia Chrome Bricks (RMK) is their extremely low porosity and chemical inertness, making them highly resistant to slag and vacuum damage​​. Compared to direct-bonded magnesite chrome brick (DMK), RMK bricks exhibit superior slag resistance and lower porosity​​. Their uniform microstructure and high degree of direct bonding contribute to excellent erosion and corrosion resistance, crucial under high-temperature conditions​​.

     

    Unique Properties:

    Rebounded Fused Magnesia Chrome Bricks (RMK) demonstrate high strength at elevated temperatures, maintaining good volume stability under extreme heat​​. These bricks are designed to withstand temperatures ranging from 1800 to 1850°C, ensuring high purity and minimal impurities​​. Their thermal shock stability, wear resistance, and erosion resistance are particularly noteworthy, making them ideal for demanding industrial applications.

     

    Applications:

    Rebounded Fused Magnesia Chrome Bricks (RMK) have proven indispensable in various smelting and refining processes. Their robustness makes them suitable for vacuum refining furnaces, Argon Oxygen Refining Furnaces, ultra-high power electric arc furnaces, and non-ferrous smelting furnaces. These bricks excel in critical furnace areas, such as working linings, hot spots, slag line zones, tuyere zones, and erosion zones, where traditional refractories might fail.

     

    Conclusion:

    The advanced properties of Rebounded Fused Magnesia Chrome Bricks (RMK), including their resistance to slag attack, vacuum damage, and thermal shock, make them the most economical and longest-lasting option for furnace lining refractories. With their widespread application in various high-stress furnace environments, RMK bricks have become an irreplaceable component in modern industrial processes.

    Rebounded-Fused-Magnesia-Chrome-Brick

    After Impregnation process treatment, the physical and chemical properties of RMK are greatly improved. The porosity will be reduced by 7%, the bulk density will increase by 0.05g/cm3, and the Cold Crushing Strength will increase by about 30MPa (This is an additional procedure).

    IMG 8553

     

    rhimagnesita We can produce RHI Magnesita standard Rebounded Fused Magnesia Chrome Brick

    Refrateknik1 We can produce Refratechnik standard Rebounded Fused Magnesia Chrome Brick

    We can produce Harbinson Walker International standard Rebounded Fused Magnesia Chrome Brick, such as:

    FG CH
    NARMAG FG
    SUPER NARMAG 145
    SUPER NARMAG FG
    TOMAHAWK

    More+

    Rebounded Fused Magnesia Chrome Brick (RMK) has been developed that contain fused magnesia chrome grain to offer improved slag resistance. Fused grain is made by melting dead burned magnesite and chrome ore in an electric arc furnace. The melted material is then poured from the furnace into ingots and allowed to cool. The resulting ingots are crushed and graded into grain for brickmaking.

    Brick made from this grain, are called “rebounded fused magnesia chrome brick”.

    Fused magnesia chrome grain has extremely low porosity and is chemically inert. In addition, brick made from this grain have a tendency to shrink on burning rather than expand, as is characteristic of many Direct-Bonded Magnesite-Chrome Brick.

    As a result of these features, the rebounded fused magnesia chrome brick has lower porosity and superior slag resistance as compared to direct-bonded magnesia chrome brick.

     

    Rebounded Fused Magnesia Chrome Brick (RMK) made of fused mag-chrome, magnesite and chromite; processed by ultra-high temperature firing. With properties of very good thermal shock stability, oxidation-reduction resistance, thermal fatigue resistance, wear resistance and erosion resistance. Especially with ultra-strong resistance to slag attack and vacuum damage. Under vacuum refining condition, or strong oxidation atmosphere, or ultra-high temperature liquid erosion, or high alkaline slag and frequent alkalinity changes slag attacks. They are proved to be the irreplaceable, the longest service life and the most economical furnace lining refractories. There-fore they are widely used in the vacuum refining furnaces (e.g. RH degasser, VOD degassing ladles), Argon Oxygen Refining Furnaces (e.g. AOD Converters), ultra-high power EAF furnace, non-ferrous smelting big furnaces (IC3 Refining Converters, Pierce Smith Converters, Noranda Furnaces, Outokumpu Flash Smelting Furnaces), or used at key parts of refining furnaces under very harsh conditions, e.g. Working linings, hot spots, slag line zone, tuyere zone, erosion zone and easily damaged parts of big furnaces. (DA means Impregnation process)

     

    Introduction:

    Rebounded Fused Magnesia Chrome Brick (RMK) represent a significant advancement in refractory materials, offering unparalleled performance in industrial furnaces. These bricks are engineered with fused magnesia chrome grain, which provides exceptional slag resistance, a critical property for maintaining furnace integrity and efficiency.

     

    Manufacturing Process:

    The Rebounded Fused Magnesia Chrome Bricks (RMK) are crafted using a specialized process that begins with melting dead burned magnesite and chrome ore in an electric arc furnace. This fusion creates a robust material with significantly reduced porosity and high chemical inertness. Once the material is melted, it’s cast into ingots and allowed to cool. These ingots are then crushed and graded, forming the grain essential for RMK brickmaking.

     

    Performance Advantages:

    One of the key features of Rebounded Fused Magnesia Chrome Bricks (RMK) is their extremely low porosity and chemical inertness, making them highly resistant to slag and vacuum damage​​. Compared to direct-bonded magnesite chrome brick (DMK), RMK bricks exhibit superior slag resistance and lower porosity​​. Their uniform microstructure and high degree of direct bonding contribute to excellent erosion and corrosion resistance, crucial under high-temperature conditions​​.

     

    Unique Properties:

    Rebounded Fused Magnesia Chrome Bricks (RMK) demonstrate high strength at elevated temperatures, maintaining good volume stability under extreme heat​​. These bricks are designed to withstand temperatures ranging from 1800 to 1850°C, ensuring high purity and minimal impurities​​. Their thermal shock stability, wear resistance, and erosion resistance are particularly noteworthy, making them ideal for demanding industrial applications.

     

    Applications:

    Rebounded Fused Magnesia Chrome Bricks (RMK) have proven indispensable in various smelting and refining processes. Their robustness makes them suitable for vacuum refining furnaces, Argon Oxygen Refining Furnaces, ultra-high power electric arc furnaces, and non-ferrous smelting furnaces. These bricks excel in critical furnace areas, such as working linings, hot spots, slag line zones, tuyere zones, and erosion zones, where traditional refractories might fail.

     

    Conclusion:

    The advanced properties of Rebounded Fused Magnesia Chrome Bricks (RMK), including their resistance to slag attack, vacuum damage, and thermal shock, make them the most economical and longest-lasting option for furnace lining refractories. With their widespread application in various high-stress furnace environments, RMK bricks have become an irreplaceable component in modern industrial processes.

    Rebounded-Fused-Magnesia-Chrome-Brick

    After Impregnation process treatment, the physical and chemical properties of RMK are greatly improved. The porosity will be reduced by 7%, the bulk density will increase by 0.05g/cm3, and the Cold Crushing Strength will increase by about 30MPa (This is an additional procedure).

    IMG 8553

     

    rhimagnesita We can produce RHI Magnesita standard Rebounded Fused Magnesia Chrome Brick

    Refrateknik1 We can produce Refratechnik standard Rebounded Fused Magnesia Chrome Brick

    We can produce Harbinson Walker International standard Rebounded Fused Magnesia Chrome Brick, such as:

    FG CH
    NARMAG FG
    SUPER NARMAG 145
    SUPER NARMAG FG
    TOMAHAWK

    OSYMEN

    MgO

    SiO2

    Cr2O3

    A.P

    B.D

    C.C.S

    R.U.L

    T.S.R

    1100 oC Water

    %

    %

    %

    %

    g/cm3

    MPa

    (Ta)oC

    Cycles

    RMK-16A-DA

    65.0

    1.2

    16-19

    14.0

    3.30

    100

    >1700

    4

    RMK-16AS

    65.0

    1.0

    16-19

    15.0

    3.28

    65

    >1700

    5

    RMK-16A

    65.0

    1.2

    16-19

    16.0

    3.25

    60

    >1700

    4

    RMK-16B

    63.0

    1.5

    16-19

    17.0

    3.20

    55

    >1700

    5

    RMK-16C

    63.0

    1.8

    16-19

    17.0

    3.15

    50

    >1700

    5

    RMK-20A-DA

    60.0

    1.2

    20-23

    13.0

    3.30

    100

    >1700

    4

    RMK-20AS

    61.0

    1.0

    20-23

    15.0

    3.30

    65

    >1700

    4

    RMK-20A

    60.0

    1.2

    20-23

    16.0

    3.25

    60

    >1700

    4

    RMK-20B

    59.0

    1.5

    20-23

    17.0

    3.22

    55

    >1700

    5

    RMK-20C

    58.0

    1.8

    20-23

    17.0

    3.20

    50

    >1700

    5

    RMK-24A-DA

    56.0

    1.2

    24-27

    14.0

    3.35

    100

    >1700

    4

    RMK-24AS

    56.0

    1.0

    24-27

    15.0

    3.32

    65

    >1700

    4

    RMK-24A

    56.0

    1.2

    24-27

    16.0

    3.27

    60

    >1700

    4

    RMK-24B

    54.0

    1.5

    24-27

    17.0

    3.24

    55

    >1700

    5

    RMK-24C

    53.0

    1.5

    24-27

    17.0

    3.22

    50

    >1700

    5

    RMK-28A-DA

    51.0

    1.2

    28-31

    14.0

    3.35

    100

    >1700

    4

    RMK-28AS

    51.0

    1.0

    28-31

    15.0

    3.33

    65

    >1700

    4

    RMK-28A

    51.0

    1.2

    28-31

    16.0

    3.30

    60

    >1700

    4

    RMK-28B

    50.0

    1.5

    28-31

    17.0

    3.26

    55

    >1700

    5

    RMK-28C

    50.0

    1.7

    28-31

    17.0

    3.24

    50

    >1700

    5

    AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

    Close
  • Direct Bonded Magnesia Chrome Brick (DMK)

    Direct Bonded Magnesia Chrome Brick (DMK)

    Direct Bonded Magnesia Chrome Bricks (DMK) refer to refractory products that are directly combined with periclase and magnesia-chrome spinel as the main crystal.  The direct bonding degree of the product increases with the decrease of SiO2 content and the increase of sintering temperature.

     

    In the presence of silicate, the binding between periclase and periclase will be strengthened by Cr2O3, but reduced by Al2O3 and Fe2O3. Adding Al2O3 or Fe2O3 in Magnesia Chrome Brick can reduce the melting point of silicate, and adding Cr2O3 can increase the melting point.

    Therefore, chromite with high Cr2O3 content has higher high-temperature strength than chromite with low Cr2O3 content.

    Secondary spinel is the characteristic of directly bonded brick. The higher the content of Cr2O3, the more intragranular and intergranular spinels, the higher the strength of the product and the stronger the slag resistance.

     

    Direct Bonded Magnesia Chrome Bricks (DMK) with properties of excellent thermal shock stability, slag attack resistance, thermal fatigue resistance, vacuum damage resistance. In addition, they are resistance to oxidation-reduction, comparatively better wear resistance and erosion resistance. Under vacuum refining conditions, or strong oxidation atmosphere, or ultrahigh temperature liquid erosion, or high alkaline slag liquid and alkalinity changes slag liquid attacks, the service life is second after RMK, and even more economical furnace lining refractories. They are widely used at Steel Smelting Furnaces working linings (e.g. RH Degasser, VOD Ladles, AOD Converters, EAF Furnace, Converters etc.) or critical parts safety linings, Non-ferrous Smelting Furnaces working linings (IC3 Converters, Pierce Smith Furnaces, Noranda Furnaces, Outokumpu Flash Smelting Furnaces, Reverberatory Furnaces etc.).  Sometimes they are used at Chemical Industries and Paper Industries furnaces working lining bricks.

     

    Introduction:

    Direct Bonded Magnesia Chrome Bricks (DMK) are a class of high-performance refractory products, characterized by their unique combination of periclase and magnesia-chrome spinel as the main crystals. These bricks are renowned for their exceptional thermal and chemical stability in demanding industrial environments.

     

    Manufacturing Insights:

    The Direct Bonded Magnesia Chrome Bricks (DMK) is intricately linked to their composition and manufacturing process. A lower SiO2 content and higher sintering temperatures contribute to an increased degree of direct bonding, enhancing the brick’s overall performance and durability.

     

    Composition and Strength:

    In Direct Bonded Magnesia Chrome Bricks (DMK), the interaction between periclase crystals is significantly influenced by the presence of silicate. The addition of Cr2O3 strengthens this bond, whereas Al2O3 and Fe2O3 can reduce it. Interestingly, adding Al2O3 or Fe2O3 decreases the melting point of silicate, while Cr2O3 increases it. This unique composition ensures that bricks with higher Cr2O3 content exhibit superior high-temperature strength and enhanced resistance to slag attacks.

     

    Characteristic Features:

    A hallmark of Direct Bonded Magnesia Chrome Bricks (DMK) is the secondary spinel formation, which is directly correlated with the Cr2O3 content. Higher Cr2O3 levels lead to an increase in both intragranular and intergranular spinels, resulting in a stronger and more slag-resistant brick.

     

    Performance Advantages:

    Direct Bonded Magnesia Chrome Bricks (DMK) are noted for their excellent thermal shock stability, resistance to slag attack, thermal fatigue, and vacuum damage. Additionally, these bricks offer superior oxidation-reduction resistance, wear resistance, and erosion resistance. Under extreme conditions like vacuum refining, strong oxidation atmospheres, ultrahigh temperature liquid erosion, and variable high alkaline slag attacks, DMK bricks demonstrate remarkable durability, second only to Rebounded Fused Magnesia Chrome Bricks (RMK) in terms of longevity and economic efficiency.

     

    Applications:

    These Direct Bonded Magnesia Chrome Bricks (DMK) find extensive applications in various industrial settings. They are crucial in the working linings of steel smelting furnaces, such as RH Degassers, VOD Ladles, AOD Converters, EAF Furnaces, and Converters. Their reliability also extends to critical safety linings in non-ferrous smelting furnaces, including IC3 Converters, Pierce Smith Furnaces, Noranda Furnaces, Outokumpu Flash Smelting Furnaces, and Reverberatory Furnaces. Beyond metallurgical applications, DMK bricks are sometimes employed in the chemical and paper industries.

     

    Conclusion:

    Direct Bonded Magnesia Chrome Bricks (DMK) stand out as a highly economical and resilient choice for furnace lining refractories. Their tailored composition and advanced properties make them indispensable in high-stress furnace environments, offering unmatched durability and cost-effectiveness.

    Direct Bonded Magnesia Chrome Brick 06 www.osymen.com 1  Direct Bonded Magnesia Chrome Brick 04 www.osymen.com 1

    Direct Bonded Magnesia Chrome Brick 07 www.osymen.com  Direct Bonded Magnesia Chrome Brick 01 www.osymen.com 1

    Direct Bonded Magnesia Chrome Brick 03 www.osymen.com 1  Direct Bonded Magnesia Chrome Brick 07 www.osymen.com 1

    Direct Bonded Magnesia Chrome Brick 05 www.osymen.com 1

     

    After Impregnation process treatment, the physical and chemical properties of Direct Bonded Magnesia Chrome Brick (DMK) are greatly improved. The porosity will be reduced by 7%, the bulk density will increase by 0.05g/cm3, and the Cold Crushing Strength will increase by about 30MPa. This is an additional procedure.

    Direct Bonded Magnesia Chrome Brick 08 www.osymen.com 1Semi Rebonded Mag-chromite Brick impregnation process treatment

     

     

    rhimagnesita We can produce RHI Magnesita standard Direct Bonded Magnesia Chrome Brick

    Refrateknik1 We can produce Refratechnik standard Direct Bonded Magnesia Chrome Brick

    We can produce Harbinson Walker International standard Direct Bonded Magnesia Chrome Brick, such as:

    N 50 DBRG:  NARMAG 50 DBRG
    N 60 DB: NARMAG 60 DB
    N 80 DB: NARMAG 80 DB
    N HNF27: NARMAG HNF27
    SN 142: SUPER NARMAG 142

    More+

    Direct Bonded Magnesia Chrome Bricks (DMK) refer to refractory products that are directly combined with periclase and magnesia-chrome spinel as the main crystal.  The direct bonding degree of the product increases with the decrease of SiO2 content and the increase of sintering temperature.

     

    In the presence of silicate, the binding between periclase and periclase will be strengthened by Cr2O3, but reduced by Al2O3 and Fe2O3. Adding Al2O3 or Fe2O3 in Magnesia Chrome Brick can reduce the melting point of silicate, and adding Cr2O3 can increase the melting point.

    Therefore, chromite with high Cr2O3 content has higher high-temperature strength than chromite with low Cr2O3 content.

    Secondary spinel is the characteristic of directly bonded brick. The higher the content of Cr2O3, the more intragranular and intergranular spinels, the higher the strength of the product and the stronger the slag resistance.

     

    Direct Bonded Magnesia Chrome Bricks (DMK) with properties of excellent thermal shock stability, slag attack resistance, thermal fatigue resistance, vacuum damage resistance. In addition, they are resistance to oxidation-reduction, comparatively better wear resistance and erosion resistance. Under vacuum refining conditions, or strong oxidation atmosphere, or ultrahigh temperature liquid erosion, or high alkaline slag liquid and alkalinity changes slag liquid attacks, the service life is second after RMK, and even more economical furnace lining refractories. They are widely used at Steel Smelting Furnaces working linings (e.g. RH Degasser, VOD Ladles, AOD Converters, EAF Furnace, Converters etc.) or critical parts safety linings, Non-ferrous Smelting Furnaces working linings (IC3 Converters, Pierce Smith Furnaces, Noranda Furnaces, Outokumpu Flash Smelting Furnaces, Reverberatory Furnaces etc.).  Sometimes they are used at Chemical Industries and Paper Industries furnaces working lining bricks.

     

    Introduction:

    Direct Bonded Magnesia Chrome Bricks (DMK) are a class of high-performance refractory products, characterized by their unique combination of periclase and magnesia-chrome spinel as the main crystals. These bricks are renowned for their exceptional thermal and chemical stability in demanding industrial environments.

     

    Manufacturing Insights:

    The Direct Bonded Magnesia Chrome Bricks (DMK) is intricately linked to their composition and manufacturing process. A lower SiO2 content and higher sintering temperatures contribute to an increased degree of direct bonding, enhancing the brick’s overall performance and durability.

     

    Composition and Strength:

    In Direct Bonded Magnesia Chrome Bricks (DMK), the interaction between periclase crystals is significantly influenced by the presence of silicate. The addition of Cr2O3 strengthens this bond, whereas Al2O3 and Fe2O3 can reduce it. Interestingly, adding Al2O3 or Fe2O3 decreases the melting point of silicate, while Cr2O3 increases it. This unique composition ensures that bricks with higher Cr2O3 content exhibit superior high-temperature strength and enhanced resistance to slag attacks.

     

    Characteristic Features:

    A hallmark of Direct Bonded Magnesia Chrome Bricks (DMK) is the secondary spinel formation, which is directly correlated with the Cr2O3 content. Higher Cr2O3 levels lead to an increase in both intragranular and intergranular spinels, resulting in a stronger and more slag-resistant brick.

     

    Performance Advantages:

    Direct Bonded Magnesia Chrome Bricks (DMK) are noted for their excellent thermal shock stability, resistance to slag attack, thermal fatigue, and vacuum damage. Additionally, these bricks offer superior oxidation-reduction resistance, wear resistance, and erosion resistance. Under extreme conditions like vacuum refining, strong oxidation atmospheres, ultrahigh temperature liquid erosion, and variable high alkaline slag attacks, DMK bricks demonstrate remarkable durability, second only to Rebounded Fused Magnesia Chrome Bricks (RMK) in terms of longevity and economic efficiency.

     

    Applications:

    These Direct Bonded Magnesia Chrome Bricks (DMK) find extensive applications in various industrial settings. They are crucial in the working linings of steel smelting furnaces, such as RH Degassers, VOD Ladles, AOD Converters, EAF Furnaces, and Converters. Their reliability also extends to critical safety linings in non-ferrous smelting furnaces, including IC3 Converters, Pierce Smith Furnaces, Noranda Furnaces, Outokumpu Flash Smelting Furnaces, and Reverberatory Furnaces. Beyond metallurgical applications, DMK bricks are sometimes employed in the chemical and paper industries.

     

    Conclusion:

    Direct Bonded Magnesia Chrome Bricks (DMK) stand out as a highly economical and resilient choice for furnace lining refractories. Their tailored composition and advanced properties make them indispensable in high-stress furnace environments, offering unmatched durability and cost-effectiveness.

    Direct Bonded Magnesia Chrome Brick 06 www.osymen.com 1  Direct Bonded Magnesia Chrome Brick 04 www.osymen.com 1

    Direct Bonded Magnesia Chrome Brick 07 www.osymen.com  Direct Bonded Magnesia Chrome Brick 01 www.osymen.com 1

    Direct Bonded Magnesia Chrome Brick 03 www.osymen.com 1  Direct Bonded Magnesia Chrome Brick 07 www.osymen.com 1

    Direct Bonded Magnesia Chrome Brick 05 www.osymen.com 1

     

    After Impregnation process treatment, the physical and chemical properties of Direct Bonded Magnesia Chrome Brick (DMK) are greatly improved. The porosity will be reduced by 7%, the bulk density will increase by 0.05g/cm3, and the Cold Crushing Strength will increase by about 30MPa. This is an additional procedure.

    Direct Bonded Magnesia Chrome Brick 08 www.osymen.com 1Semi Rebonded Mag-chromite Brick impregnation process treatment

     

     

    rhimagnesita We can produce RHI Magnesita standard Direct Bonded Magnesia Chrome Brick

    Refrateknik1 We can produce Refratechnik standard Direct Bonded Magnesia Chrome Brick

    We can produce Harbinson Walker International standard Direct Bonded Magnesia Chrome Brick, such as:

    N 50 DBRG:  NARMAG 50 DBRG
    N 60 DB: NARMAG 60 DB
    N 80 DB: NARMAG 80 DB
    N HNF27: NARMAG HNF27
    SN 142: SUPER NARMAG 142

    OSYMEN

    MgO

    SiO2

    Cr2O3

    A.P

    B.D

    C.C.S

    R.U.L

    T.S.R

    1100 oC Water

    %

    %

    %

    %

    g/cm3

    MPa

    (Ta)oC

    Cycles

    DMK-8A-DA

    78.0

    1.5

    8-11

    15.0

    3.20

    70

    >1700

    6

    DMK-8AS

    78.0

    1.2

    8-11

    17.0

    3.17

    50

    >1700

    6

    DMK-8A

    78.0

    1.5

    8-11

    17.0

    3.15

    50

    >1700

    6

    DMK-8B

    78.0

    2.0

    8-11

    18.0

    3.10

    45

    >1680

    7

    DMK-8C

    76.0

    2.5

    8-11

    18.5

    3.05

    40

    >1650

    7

    DMK-12A-DA

    72.0

    1.5

    12-15

    15.0

    3.20

    70

    >1700

    6

    DMK-12AS

    72.0

    1.2

    12-15

    17.0

    3.17

    50

    >1700

    6

    DMK-12A

    72.0

    1.5

    12-15

    17.0

    3.15

    50

    >1700

    6

    DMK-12B

    72.0

    2.0

    12-15

    18.0

    3.10

    45

    >1680

    7

    DMK-12C

    70.0

    2.5

    12-15

    18.5

    3.05

    40

    >1650

    7

    DMK-16A-DA

    64.0

    1.5

    16-19

    15.0

    3.20

    70

    >1700

    6

    DMK-16AS

    65.0

    1.2

    16-19

    17.0

    3.18

    50

    >1700

    6

    DMK-16A

    64.0

    1.5

    16-19

    17.0

    3.15

    45

    >1700

    6

    DMK-16B

    62.0

    2.0

    16-19

    18.0

    3.10

    40

    >1680

    7

    DMK-16C

    61.0

    2.5

    16-19

    18.5

    3.05

    35

    >1650

    7

    DMK-20A-DA

    58.0

    1.5

    20-23

    16.0

    3.20

    70

    >1700

    6

    DMK-20AS

    59.0

    1.2

    20-23

    18.0

    3.20

    45

    >1700

    6

    DMK-20A

    58.0

    1.5

    20-23

    18.0

    3.15

    40

    >1700

    6

    DMK-20B

    56.0

    2.0

    20-23

    19.0

    3.10

    35

    >1700

    7

    DMK-20C

    55.0

    2.5

    20-23

    20.0

    3.05

    35

    >1700

    7

    DMK-24A-DA

    48.0

    1.5

    24-27

    18.0

    3.20

    70

    >1700

    6

    DMK-24AS

    48.0

    1.2

    24-27

    20.0

    3.18

    45

    >1700

    6

    DMK-24A

    48.0

    1.5

    24-27

    20.0

    3.15

    40

    >1700

    6

    DMK-24B

    48.0

    2.0

    24-27

    21.0

    3.10

    35

    >1700

    7

    DMK-24C

    46.0

    2.5

    24-27

    21.5

    3.05

    35

    >1700

    7

    DMK-28A-DA

    42.0

    1.5

    28-31

    18.0

    3.20

    70

    >1700

    6

    DMK-28AS

    42.0

    1.2

    28-31

    20.0

    3.18

    45

    >1700

    6

    DMK-28A

    42.0

    1.5

    28-31

    20.0

    3.15

    40

    >1700

    6

    DMK-28B

    42.0

    2.0

    28-31

    21.0

    3.10

    35

    >1700

    7

    DMK-28C

    40.0

    2.5

    28-31

    21.5

    3.05

    35

    >1700

    7

    AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

    Close
  • Magnesia Alumina Chrome Brick

    Magnesia Alumina Chrome Brick

    Magnesia Alumina Chrome Brick (MAK) made of Magnesite, Synthetic Spinel and Chromite, processed by medium high temperature firing.

    Comparing with same grade of Magnesia Bricks(MZ), it possess excellent thermal shock stability, high refractoriness under load and high temperature mechanical flexibility.

    They are mainly used at all types of industrial furnaces arch roof areas, vigorous thermal shock damage areas and continuous high temperature under load areas.

    It is upgrade product of pure magnesia brick (MZ) and magnesia alumina brick(MA).

    %E4%B8%8B%E8%BD%BD We can produce as Harbinson Walker International standard Magnesia Alumina Chrome Brick (MAK)

    More+

    Magnesia Alumina Chrome Brick (MAK) made of Magnesite, Synthetic Spinel and Chromite, processed by medium high temperature firing.

    Comparing with same grade of Magnesia Bricks(MZ), it possess excellent thermal shock stability, high refractoriness under load and high temperature mechanical flexibility.

    They are mainly used at all types of industrial furnaces arch roof areas, vigorous thermal shock damage areas and continuous high temperature under load areas.

    It is upgrade product of pure magnesia brick (MZ) and magnesia alumina brick(MA).

    %E4%B8%8B%E8%BD%BD We can produce as Harbinson Walker International standard Magnesia Alumina Chrome Brick (MAK)

    OSYMEN

    MgO

    Al2O3+ Cr2O3

    A.P

    B.D

    C.C.S

    R.U.L

    T.S.R

    1100°C Water

    %

    %

    %

    g/cm3

    MPa

    (Ta)°C

    Cycles

    MAK-90A

    85.0

    8-12

    18.0

    2.98

    45

    1650

    6

    MAK-90B

    82.0

    8-12

    19.0

    2.95

    45

    1600

    6

    MAK-90C

    77.0

    8-12

    20.0

    2.90

    40

    1550

    6

    AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

    Close
  • Magnesia Dolomite Brick

    Magnesia Dolomite Brick

    Magnesia Dolomite Brick are available in burned and carbon-bonded compositions. The carbon-bonded varieties include both pitch and resin-bonded versions.
    Some of the carbon-bonded products contain flake graphite and are somewhat analogous to magnesite-carbon brick. Magnesia Dolomite Brick are widely applied in applications as diverse as argon-oxygen decarburization vessels (AOD’s), rotary cement kilns and steel ladles.

    Magnesia Dolomite Brick

    Magnesia Dolomite Brick is an alkaline refractory with many advantages. Like high refractoriness, strong resistance to alkaline slag, stable thermodynamic properties, high temperature and vacuum stability, and so on. Therefore, it is considered as the preferred substitute for Magnesia Chrome Brick. In addition, Magnesite Dolomite Brick also have the characteristics of non-polluting molten steel, purifying molten steel, and catching non-metallic impurities such as Al2O3, S, P in molten steel that other refractory materials cannot match.

    Magnesia Dolomite sand can be divided into three types according to CaO/MgO: (CaO/MgO>1.39), (CaO/MgO=1.39) and (CaO/MgO<1.39).

    Magnesia Dolomite sand is the raw material of high-quality alkaline refractory with oxides MgO and CaO as the main chemical components, so Magnesite Dolomite refractory has strong corrosion resistance to alkaline slag.

     The influence of three main impurities in Magnesia Dolomite bricks on the high temperature properties of CaO varies greatly.

    Among them, SiO2 reacts with CaO to generate C3S or C2S, with melting points of 1900°C and 2130°C respectively. Both of them belong to minerals with high melting points, and have little impact on the high-temperature properties of CaO.

    However, Fe2O3 and Al2O3 react with CaO to form minerals such as C2F and C4AF with low melting points of 1436°C and 1415°C, respectively. The formation of these two low melting point minerals has a great negative impact on the high temperature properties of CaO.

     Magnesia Dolomite brick are widely applied in applications as diverse as argon-oxygen decarburization vessels (AOD’s), VOD furnace and LF furnace.

    More+

    Magnesia Dolomite Brick are available in burned and carbon-bonded compositions. The carbon-bonded varieties include both pitch and resin-bonded versions.
    Some of the carbon-bonded products contain flake graphite and are somewhat analogous to magnesite-carbon brick. Magnesia Dolomite Brick are widely applied in applications as diverse as argon-oxygen decarburization vessels (AOD’s), rotary cement kilns and steel ladles.

    Magnesia Dolomite Brick

    Magnesia Dolomite Brick is an alkaline refractory with many advantages. Like high refractoriness, strong resistance to alkaline slag, stable thermodynamic properties, high temperature and vacuum stability, and so on. Therefore, it is considered as the preferred substitute for Magnesia Chrome Brick. In addition, Magnesite Dolomite Brick also have the characteristics of non-polluting molten steel, purifying molten steel, and catching non-metallic impurities such as Al2O3, S, P in molten steel that other refractory materials cannot match.

    Magnesia Dolomite sand can be divided into three types according to CaO/MgO: (CaO/MgO>1.39), (CaO/MgO=1.39) and (CaO/MgO<1.39).

    Magnesia Dolomite sand is the raw material of high-quality alkaline refractory with oxides MgO and CaO as the main chemical components, so Magnesite Dolomite refractory has strong corrosion resistance to alkaline slag.

     The influence of three main impurities in Magnesia Dolomite bricks on the high temperature properties of CaO varies greatly.

    Among them, SiO2 reacts with CaO to generate C3S or C2S, with melting points of 1900°C and 2130°C respectively. Both of them belong to minerals with high melting points, and have little impact on the high-temperature properties of CaO.

    However, Fe2O3 and Al2O3 react with CaO to form minerals such as C2F and C4AF with low melting points of 1436°C and 1415°C, respectively. The formation of these two low melting point minerals has a great negative impact on the high temperature properties of CaO.

     Magnesia Dolomite brick are widely applied in applications as diverse as argon-oxygen decarburization vessels (AOD’s), VOD furnace and LF furnace.

    OSYMEN

    MgO

    CaO

    A.P

    B.D

    C.C.S

    R.U.L

    %

    %

    %

    g/cm3

    MPa

    (Ta)°C

    MD-20A

    75.0

    18-22

    8.0

    3.00

    55

    1700

    MD-20B

    75.0

    18-22

    8.0

    2.95

    50

    1700

    MD-30A

    65.0

    28-32

    8.0

    3.00

    55

    1700

    MD-30B

    65.0

    28-32

    8.0

    2.95

    50

    1700

    MD-40A

    55.0

    38-42

    8.0

    3.00

    55

    1700

    MD-40B

    55.0

    38-42

    8.0

    2.95

    50

    1700

    AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load

    Close
  • Magnesia Brick

    Magnesia Brick

    The raw material of Magnesia Brick (MZ) is mainly magnesite, and its basic component is MgCO3.
    Magnesia brick is an alkaline refractory material, which has strong resistance to alkaline slag, but cannot resist the erosion of acid slag. At 1600°C, it can react with silica brick, clay brick and even high-alumina brick. The refractories of magnesia brick are above 2000°C, but its Refractories under Load point is only 1500~1550°C. And the temperature interval from softening to 40% deformation is very small, only 30~50°C. The Thermal Shock Resistance of magnesia brick is also poor, which is an important reason for the damage of magnesia brick.

    When the liquid phase appears in the brick under high temperature, it will suddenly shrink. The thermal conductivity of magnesia brick is high, which is second only to carbon brick and silicon carbide brick in refractory products. It decreases with the increase of temperature.
    The thermal shock resistance of magnesia brick is poor. Improving the purity of magnesia brick can appropriately improve the thermal shock resistance.

    Various grades of dead-burned magnesite are available for the production of magnesite brick. They range from natural dead-burned materials, with MgO contents of 90% or less, to high purity synthetic magnesites containing 96% MgO or greater.

    A large amount of work has been done to produce highly refractory magnesites. Since magnesia itself has an extremely high melting point, i.e., 5070°F (2800°C), the ultimate refractoriness of a magnesite brick is often determined by the amount and type of impurity within the grain. In practice, the refractoriness of a dead burned magnesite is improved by lowering the number of impurities, adjusting the chemistry of the impurities or both.

    There are many types of magnesite refractories, both burned and chemically bonded. For simplification, they can be divided into two categories on the basis of chemistry. The first category consists of brick made with low boron magnesites, generally less than 0.02% boron oxide, that have lime to-silica ratios of two to one or greater. Often, the lime-to-silica ratio of these brick is intentionally adjusted to a molar ratio of two to one to create a dicalcium silicate bond that gives the brick high hot strength. Brick with lime-to-silica ratios greater than two to one are often of higher purity than the dicalcium silicate-bonded brick. This greater chemical purity makes them more desirable for certain applications.

    The second category of magnesite brick generally has lime-to-silica ratios between zero and one, on a molar basis.

    These bricks may contain relatively high boron oxide contents (greater than 0.1% B2O3) in order to impart good hydration resistance. Sometimes, for economic reasons, these bricks are made with lower purity natural dead burned magnesites with magnesia contents of 95% or less. At other times, the brick is made with very pure magnesites with MgO contents greater than 98% for better refractoriness.
    Magnesia Brick for Glass Furnace Regenerator 1
    Magnesia Birck (MZ) was made primarily of pure magnesite of various sizes and burnt under media to high temperature. It has excellent resistance to strong alkaline slag attack, alkaline vapour erosion, oxidation-reduction erosion and good thermal conductivity. However, it is average in thermal fatigue resistance, and wear-resistance erosion. It is poor in thermal shock stability, and bad resistance to acidic slag attack. It was used widely in working lining, safety linings and permanent linings at traditional Steel and Non-ferrous Metal Smelting Furnaces (OHF Furnaces, EAF Furnaces, Converters, Mixers, Flash Smelting Furnaces, Copper Converters, Reverberatory Furnaces etc.). After pitch-impregnated, resistance of slag attack and thermal shock stability will be highly enhanced and improved.

    We can produce Harbinson Walker International standard Magnesia brick, such as:

    N 90 B CH: NARMAG 90B CH
    N B: NARMAG B
    SN B CH: SUPER NARMAG B CH
    SN HF: SUPER NARMAG HF

    More+

    The raw material of Magnesia Brick (MZ) is mainly magnesite, and its basic component is MgCO3.
    Magnesia brick is an alkaline refractory material, which has strong resistance to alkaline slag, but cannot resist the erosion of acid slag. At 1600°C, it can react with silica brick, clay brick and even high-alumina brick. The refractories of magnesia brick are above 2000°C, but its Refractories under Load point is only 1500~1550°C. And the temperature interval from softening to 40% deformation is very small, only 30~50°C. The Thermal Shock Resistance of magnesia brick is also poor, which is an important reason for the damage of magnesia brick.

    When the liquid phase appears in the brick under high temperature, it will suddenly shrink. The thermal conductivity of magnesia brick is high, which is second only to carbon brick and silicon carbide brick in refractory products. It decreases with the increase of temperature.
    The thermal shock resistance of magnesia brick is poor. Improving the purity of magnesia brick can appropriately improve the thermal shock resistance.

    Various grades of dead-burned magnesite are available for the production of magnesite brick. They range from natural dead-burned materials, with MgO contents of 90% or less, to high purity synthetic magnesites containing 96% MgO or greater.

    A large amount of work has been done to produce highly refractory magnesites. Since magnesia itself has an extremely high melting point, i.e., 5070°F (2800°C), the ultimate refractoriness of a magnesite brick is often determined by the amount and type of impurity within the grain. In practice, the refractoriness of a dead burned magnesite is improved by lowering the number of impurities, adjusting the chemistry of the impurities or both.

    There are many types of magnesite refractories, both burned and chemically bonded. For simplification, they can be divided into two categories on the basis of chemistry. The first category consists of brick made with low boron magnesites, generally less than 0.02% boron oxide, that have lime to-silica ratios of two to one or greater. Often, the lime-to-silica ratio of these brick is intentionally adjusted to a molar ratio of two to one to create a dicalcium silicate bond that gives the brick high hot strength. Brick with lime-to-silica ratios greater than two to one are often of higher purity than the dicalcium silicate-bonded brick. This greater chemical purity makes them more desirable for certain applications.

    The second category of magnesite brick generally has lime-to-silica ratios between zero and one, on a molar basis.

    These bricks may contain relatively high boron oxide contents (greater than 0.1% B2O3) in order to impart good hydration resistance. Sometimes, for economic reasons, these bricks are made with lower purity natural dead burned magnesites with magnesia contents of 95% or less. At other times, the brick is made with very pure magnesites with MgO contents greater than 98% for better refractoriness.
    Magnesia Brick for Glass Furnace Regenerator 1
    Magnesia Birck (MZ) was made primarily of pure magnesite of various sizes and burnt under media to high temperature. It has excellent resistance to strong alkaline slag attack, alkaline vapour erosion, oxidation-reduction erosion and good thermal conductivity. However, it is average in thermal fatigue resistance, and wear-resistance erosion. It is poor in thermal shock stability, and bad resistance to acidic slag attack. It was used widely in working lining, safety linings and permanent linings at traditional Steel and Non-ferrous Metal Smelting Furnaces (OHF Furnaces, EAF Furnaces, Converters, Mixers, Flash Smelting Furnaces, Copper Converters, Reverberatory Furnaces etc.). After pitch-impregnated, resistance of slag attack and thermal shock stability will be highly enhanced and improved.

    We can produce Harbinson Walker International standard Magnesia brick, such as:

    N 90 B CH: NARMAG 90B CH
    N B: NARMAG B
    SN B CH: SUPER NARMAG B CH
    SN HF: SUPER NARMAG HF

    OSYMEN

    MgO

    SiO2

    A.P

    B.D

    C.C.S

    R.U.L

    %

    %

    %

    g/cm3

    MPa

    (Ta)°C

    MZ-91

    91.0

    4.0

    18.0

    2.90

    50

    1560

    MZ-93

    93.0

    3.5

    18.0

    2.92

    50

    1620

    MZ-95A

    95.3

    1.8

    16.0

    2.96

    65

    1660

    MZ-95B

    95.0

    2.0

    17.0

    2.95

    60

    1650

    MZ-95C

    94.5

    2.5

    18.0

    2.90

    60

    1600

    MZ-96A

    96.3

    1.0

    16.0

    2.98

    65

    1680

    MZ-96B

    96.0

    1.2

    17.0

    2.95

    60

    1650

    MZ-96C

    95.5

    1.5

    17.0

    2.93

    60

    1620

    MZ-97A

    97.2

    0.8

    16.0

    3.02

    70

    >1700

    MZ-97B

    97.0

    1.0

    17.0

    3.00

    65

    >1700

    MZ-97C

    96.8

    1.2

    17.0

    2.96

    65

    1650

    MZ-98A

    98.2

    0.8

    15.0

    3.05

    75

    >1700

    MZ-98B

    98.0

    0.8

    16.0

    3.02

    70

    >1700

    MZ-98C

    97.5

    1.0

    16.0

    3.00

    65

    >1700

     AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

    Close
  • Magnesia Alumina Spinel Brick

    Magnesia Alumina Spinel Brick

    Magnesia Alumina Spinel Bricks: The Refractory Choice for High Durability and Performance

     

    Introduction:


    Magnesia Alumina Spinel bricks are renowned for their high-temperature performance and durability. Used in various industries, these refractory products are critical for processes requiring robust materials that can withstand extreme conditions. With periclase and magnesia-alumina spinel as their main mineral phases, these bricks offer exceptional properties that make them a preferred choice for many applications​​.

     

    Composition and Benefits

    Magnesia Alumina Spinel bricks are composed of magnesia (MgO) and spinel, which is a combination of alumina (Al2O3) and magnesium oxide. This composition offers excellent thermal stability, corrosion resistance, and mechanical strength. The main component, periclase, provides high refractoriness, making these bricks suitable for use in environments with temperatures exceeding 1500°C​​.

    Mechanical Properties and Manufacturing

    The mechanical properties of Magnesia Alumina Spinel bricks, such as bend strength, modulus, and fracture toughness, are optimized through precise manufacturing processes. These processes often involve hot-pressing magnesia powder with varying percentages of spinel powder, which affects the brick’s overall performance. This meticulous preparation ensures that the bricks can meet the demanding requirements of industrial applications​​.

     

    Environmental Impact and Applications

    Magnesia Alumina Spinel bricks emerged as a superior alternative to magnesia chromite refractories due to the latter’s environmental concerns related to chromium compounds. Not only are they environmentally friendly, but they also boast a higher eutectic point, making them ideal for lining the cooling and transitional zones in cement kilns, where temperatures can reach up to 2135°C​​.

     

    Innovative Synthesis Techniques

    Advancements in the synthesis of Magnesia Alumina Spinel bricks involve using alumina–magnesia–silica ternary equilibrium phase diagrams. By exploring various sources of alumina and magnesia, manufacturers can produce aggregates that meet specific industrial requirements, further enhancing the bricks’ suitability for high-performance applications​​.

     

    The Evolution and Production

    China has been at the forefront of producing the first-generation magnesia-spinel bricks. These bricks are typically made from a combination of high-purity magnesia and synthetic magnesia-alumina spinel or from magnesia with bauxite clinker fine powder. The controlled addition of alumina content, ranging from 5–10%, allows for the production of bricks that can perform under the most demanding conditions​​.

    Conclusion:

    Magnesia Alumina Spinel bricks represent a significant advancement in refractory materials, offering a combination of high-temperature capability, mechanical strength, and environmental safety. As industries continue to push the boundaries of temperature and performance, these bricks stand out as a key component in achieving operational excellence and sustainability.

     

    Magnesia Alumina Spinel Brick (MS) /Magnesia Spinel Brick have been more broadly used in recent years. The term “spinel” as used in describing this type of brick refers to the mineral MgO•AI2O3. In discussing magnesite chrome brick and chrome ores, the term “spinel” is often used to refer to the family of minerals that crystallize in the cubic system and have the general formula RO•R2O3, where RO may be MgO, and FeO and R2O3 may be Fe2O3, Al2O3 and Cr2O3. While usage of the term “spinel” in this broader sense is accepted practice, the mineral spinel has the chemical formula MgO•Al2O3. It has become accepted usage to use the term Magnesite-Spinel Brick (MSB) to refer to the products containing MgO•Al2O3.

    A family of magnesite-spinel brick has been developed by combining the constituent raw materials in various ways. Some magnesite-spinel bricks are made by adding fine alumina to compositions composed mainly of magnesia. On firing, the fine alumina reacts with the fine magnesia in the matrix of the brick to form an in-situ spinel bond. An alternative is to add spinel grain to a composition containing magnesia. One of the principal benefits of combining spinel and magnesia is that the resulting compositions have better spalling resistance than brick made solely with dead burned magnesite. This feature results in the avoidance or inhibition of peel spalling caused by temperature cycling and infiltration of constituents from the service environment. Spinel additions also lower the thermal expansion coefficients of magnesite compositions. This can reduce thermal stresses that could contribute to cracking in certain environments.

    A desire to use chrome-free basic brick for environmental reasons has increased the importance of Magnesite Spinel Brick (MAS). Trivalent chromium (Cr+3) present in magnesite-chrome brick can be converted to the hexavalent state (Cr+6) by reaction with alkalies, alkaline earth constituents and other compounds that are present in some service environments. These factors have led to broad use of magnesite-spinel brick in rotary cement kilns. They have excellent spalling resistance, good thermal expansion characteristics and have been shown to provide excellent service results in many rotary kilns.

     

    Magnesia Alumina Spinel BrickMagnesia Alumina Spinel Brick

    Magnesia Alumina Spinel BrickMagnesite Spinel Brick for Cement Kiln 06 www.osymen.com 1

     

    Magnesia Alumina Spinel Brick (MAS) is made primarily of magnesia (corundum grain) and a few synthetic spinels, is pressed under high temperature and produced by high temperature firing. It is the upgrade product of pure magnesia brick and magnesia alumina brick. Compared with Magnesia Alumina Brick (corundum brick) of same substrate, it has excellent RUL and TSR. Therefore, it was used at area where it stands for fierce thermal shock damage and longtime high temperature in the high temperature industrial furnaces such as VOD ladle molten metal line and free zone.

    %E4%B8%8B%E8%BD%BD We can produce Harbinson Walker International standard Magnesia Alumina Spinel Brick, such as:

    VESTA

    rhimagnesita We can produce RHI Magnesita standard Magnesia Alumina Spinel Brick

    Refrateknik1 We can produce Refratechnik standard Magnesia Alumina Spinel Brick, such as:

    TOPMAG A1
    TOPMAG AF
    TOPMAG TR
    RG S

    More+

    Magnesia Alumina Spinel Bricks: The Refractory Choice for High Durability and Performance

     

    Introduction:


    Magnesia Alumina Spinel bricks are renowned for their high-temperature performance and durability. Used in various industries, these refractory products are critical for processes requiring robust materials that can withstand extreme conditions. With periclase and magnesia-alumina spinel as their main mineral phases, these bricks offer exceptional properties that make them a preferred choice for many applications​​.

     

    Composition and Benefits

    Magnesia Alumina Spinel bricks are composed of magnesia (MgO) and spinel, which is a combination of alumina (Al2O3) and magnesium oxide. This composition offers excellent thermal stability, corrosion resistance, and mechanical strength. The main component, periclase, provides high refractoriness, making these bricks suitable for use in environments with temperatures exceeding 1500°C​​.

    Mechanical Properties and Manufacturing

    The mechanical properties of Magnesia Alumina Spinel bricks, such as bend strength, modulus, and fracture toughness, are optimized through precise manufacturing processes. These processes often involve hot-pressing magnesia powder with varying percentages of spinel powder, which affects the brick’s overall performance. This meticulous preparation ensures that the bricks can meet the demanding requirements of industrial applications​​.

     

    Environmental Impact and Applications

    Magnesia Alumina Spinel bricks emerged as a superior alternative to magnesia chromite refractories due to the latter’s environmental concerns related to chromium compounds. Not only are they environmentally friendly, but they also boast a higher eutectic point, making them ideal for lining the cooling and transitional zones in cement kilns, where temperatures can reach up to 2135°C​​.

     

    Innovative Synthesis Techniques

    Advancements in the synthesis of Magnesia Alumina Spinel bricks involve using alumina–magnesia–silica ternary equilibrium phase diagrams. By exploring various sources of alumina and magnesia, manufacturers can produce aggregates that meet specific industrial requirements, further enhancing the bricks’ suitability for high-performance applications​​.

     

    The Evolution and Production

    China has been at the forefront of producing the first-generation magnesia-spinel bricks. These bricks are typically made from a combination of high-purity magnesia and synthetic magnesia-alumina spinel or from magnesia with bauxite clinker fine powder. The controlled addition of alumina content, ranging from 5–10%, allows for the production of bricks that can perform under the most demanding conditions​​.

    Conclusion:

    Magnesia Alumina Spinel bricks represent a significant advancement in refractory materials, offering a combination of high-temperature capability, mechanical strength, and environmental safety. As industries continue to push the boundaries of temperature and performance, these bricks stand out as a key component in achieving operational excellence and sustainability.

     

    Magnesia Alumina Spinel Brick (MS) /Magnesia Spinel Brick have been more broadly used in recent years. The term “spinel” as used in describing this type of brick refers to the mineral MgO•AI2O3. In discussing magnesite chrome brick and chrome ores, the term “spinel” is often used to refer to the family of minerals that crystallize in the cubic system and have the general formula RO•R2O3, where RO may be MgO, and FeO and R2O3 may be Fe2O3, Al2O3 and Cr2O3. While usage of the term “spinel” in this broader sense is accepted practice, the mineral spinel has the chemical formula MgO•Al2O3. It has become accepted usage to use the term Magnesite-Spinel Brick (MSB) to refer to the products containing MgO•Al2O3.

    A family of magnesite-spinel brick has been developed by combining the constituent raw materials in various ways. Some magnesite-spinel bricks are made by adding fine alumina to compositions composed mainly of magnesia. On firing, the fine alumina reacts with the fine magnesia in the matrix of the brick to form an in-situ spinel bond. An alternative is to add spinel grain to a composition containing magnesia. One of the principal benefits of combining spinel and magnesia is that the resulting compositions have better spalling resistance than brick made solely with dead burned magnesite. This feature results in the avoidance or inhibition of peel spalling caused by temperature cycling and infiltration of constituents from the service environment. Spinel additions also lower the thermal expansion coefficients of magnesite compositions. This can reduce thermal stresses that could contribute to cracking in certain environments.

    A desire to use chrome-free basic brick for environmental reasons has increased the importance of Magnesite Spinel Brick (MAS). Trivalent chromium (Cr+3) present in magnesite-chrome brick can be converted to the hexavalent state (Cr+6) by reaction with alkalies, alkaline earth constituents and other compounds that are present in some service environments. These factors have led to broad use of magnesite-spinel brick in rotary cement kilns. They have excellent spalling resistance, good thermal expansion characteristics and have been shown to provide excellent service results in many rotary kilns.

     

    Magnesia Alumina Spinel BrickMagnesia Alumina Spinel Brick

    Magnesia Alumina Spinel BrickMagnesite Spinel Brick for Cement Kiln 06 www.osymen.com 1

     

    Magnesia Alumina Spinel Brick (MAS) is made primarily of magnesia (corundum grain) and a few synthetic spinels, is pressed under high temperature and produced by high temperature firing. It is the upgrade product of pure magnesia brick and magnesia alumina brick. Compared with Magnesia Alumina Brick (corundum brick) of same substrate, it has excellent RUL and TSR. Therefore, it was used at area where it stands for fierce thermal shock damage and longtime high temperature in the high temperature industrial furnaces such as VOD ladle molten metal line and free zone.

    %E4%B8%8B%E8%BD%BD We can produce Harbinson Walker International standard Magnesia Alumina Spinel Brick, such as:

    VESTA

    rhimagnesita We can produce RHI Magnesita standard Magnesia Alumina Spinel Brick

    Refrateknik1 We can produce Refratechnik standard Magnesia Alumina Spinel Brick, such as:

    TOPMAG A1
    TOPMAG AF
    TOPMAG TR
    RG S

    OSYMEN

    MgO

    Al2O3

    A.P

    B.D

    C.C.S

    R.U.L

    T.S.R

    1100°C Air

    %

    %

    %

    g/cm3

    MPa

    (Ta)°C

    Cycles

    MAS-5A

    88.0

    5-7

    17.0

    2.95

    55

    >1700

    >100

    MAS-5B

    88.0

    5-7

    18.0

    2.93

    50

    >1700

    >100

    MAS-5C

    87.0

    5-7

    19.0

    2.92

    45

    >1700

    >80

    MAS-10A

    84.0

    9-11

    17.0

    2.95

    55

    >1700

    >100

    MAS-10B

    84.0

    9-11

    18.0

    2.93

    50

    >1700

    >100

    MAS-10C

    82.0

    9-11

    19.0

    2.92

    45

    >1700

    >80

    MAS-90A

    5.0

    92.0

    15.0

    3.10

    80

    >1700

    >4 water

    MAS-90B

    5.0

    92.0

    15.0

    3.05

    70

    >1650

    >4 water

    AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

    Close
  • Magnesia Alumina Brick

    Magnesia Alumina Brick

    Magnesia Alumina Brick (MA) is an alkaline refractory material made of magnesia and industrial aluminum oxide or bauxite as raw materials, crushed and shaped, and sintered at about 1600°C. The refractories are greater than 2000°C, and the resistance to thermal shock resistance is better than that of Magnesia Brick(MZ), and it can resist the erosion of alkaline slag. It is used to build the top of alkaline open hearth furnace and electric furnace for steelmaking.
    Magnesia-alumina brick is mainly composed of periclase and magnesia-alumina spinel as matrix. It is better in thermal shock resistance than magnesia brick. In order to improve the thermal shock resistance of magnesia brick, alumina or bauxite clinker fines are introduced into the ingredients to form magnesia alumina spinel matrix, thus making magnesia alumina brick. Magnesia Alumina Brick are characterized by good Thermal Shock Resistance (TSR), high temperature of Refractoriness under Load (RUL), RUL above 1580°C, and good glass corrosion resistance. With the increase of the content, the apparent porosity of the brick increases. However, when the content is less than 10%, the brick is still relatively dense, and the apparent porosity can reach 14%, generally 15%~18%.

     

    Compared with Magnesia Brick (MZ), Magnesia Alumina Brick has the following characteristics:
    1. Magnesia Alumina Brick have good Thermal Shock Resistance, and water cycles for 20-25 times, or even higher. This is its most prominent advantage, much better than ordinary Magnesia Brick. 
    2. The main performance of Magnesia Alumina Brick is also slightly stronger than that of Magnesia Brick. Due to the high melting point of magnesia-alumina spinel itself, the RUL of Magnesia Alumina Brick is better than that of magnesia brick, reaching 1620~1690°C.

    The ability of magnesia alumina spinel to protect periclase particles from slag erosion is stronger than that of calcium-magnesium olivine, so the ability of Magnesia Alumina Brick to resist alkaline slag and iron oxide slag is stronger than that of Magnesia Brick.

    Magnesia Alumina Brick

    It is made primarily of magnesia, with a few high alumina bauxites, pressed under high pressure and produced by medium temperature firing. It is an upgrade of pure Magnesia Brick (MZ). Compared with magnesia brick of same substrate, it has higher RUL, resistance to slag penetration and thermal shock as well as high temperature mechanical flexibility. It was widely used as working lining and safety lining at non-critical parts of traditional metal smelting furnace (such as open-hearth furnace, convertor and non-ferrous smelter) as well as small and medium size Glass Regenerator.

    %E4%B8%8B%E8%BD%BD We can produce as Harbinson Walker International standard Magnesia Alumina Brick (MA)

    rhimagnesita We can produce as RHI Magnesita standard Magnesia Alumina Brick (MA)

    Refrateknik1 We can produce as Refratechnik standard Magnesia Alumina Brick (MA)

    More+

    Magnesia Alumina Brick (MA) is an alkaline refractory material made of magnesia and industrial aluminum oxide or bauxite as raw materials, crushed and shaped, and sintered at about 1600°C. The refractories are greater than 2000°C, and the resistance to thermal shock resistance is better than that of Magnesia Brick(MZ), and it can resist the erosion of alkaline slag. It is used to build the top of alkaline open hearth furnace and electric furnace for steelmaking.
    Magnesia-alumina brick is mainly composed of periclase and magnesia-alumina spinel as matrix. It is better in thermal shock resistance than magnesia brick. In order to improve the thermal shock resistance of magnesia brick, alumina or bauxite clinker fines are introduced into the ingredients to form magnesia alumina spinel matrix, thus making magnesia alumina brick. Magnesia Alumina Brick are characterized by good Thermal Shock Resistance (TSR), high temperature of Refractoriness under Load (RUL), RUL above 1580°C, and good glass corrosion resistance. With the increase of the content, the apparent porosity of the brick increases. However, when the content is less than 10%, the brick is still relatively dense, and the apparent porosity can reach 14%, generally 15%~18%.

     

    Compared with Magnesia Brick (MZ), Magnesia Alumina Brick has the following characteristics:
    1. Magnesia Alumina Brick have good Thermal Shock Resistance, and water cycles for 20-25 times, or even higher. This is its most prominent advantage, much better than ordinary Magnesia Brick. 
    2. The main performance of Magnesia Alumina Brick is also slightly stronger than that of Magnesia Brick. Due to the high melting point of magnesia-alumina spinel itself, the RUL of Magnesia Alumina Brick is better than that of magnesia brick, reaching 1620~1690°C.

    The ability of magnesia alumina spinel to protect periclase particles from slag erosion is stronger than that of calcium-magnesium olivine, so the ability of Magnesia Alumina Brick to resist alkaline slag and iron oxide slag is stronger than that of Magnesia Brick.

    Magnesia Alumina Brick

    It is made primarily of magnesia, with a few high alumina bauxites, pressed under high pressure and produced by medium temperature firing. It is an upgrade of pure Magnesia Brick (MZ). Compared with magnesia brick of same substrate, it has higher RUL, resistance to slag penetration and thermal shock as well as high temperature mechanical flexibility. It was widely used as working lining and safety lining at non-critical parts of traditional metal smelting furnace (such as open-hearth furnace, convertor and non-ferrous smelter) as well as small and medium size Glass Regenerator.

    %E4%B8%8B%E8%BD%BD We can produce as Harbinson Walker International standard Magnesia Alumina Brick (MA)

    rhimagnesita We can produce as RHI Magnesita standard Magnesia Alumina Brick (MA)

    Refrateknik1 We can produce as Refratechnik standard Magnesia Alumina Brick (MA)

    OSYMEN

    MgO

    Al2O3

    A.P

    B.D

    C.C.S

    R.U.L

    T.S.R

    1100°C Water

    %

    %

    %

    g/cm3

    MPa

    (Ta)°C

    Cycles

    MA-90A

    87.0

    6-9

    18.0

    2.95

    50

    1620

    4

    MA-90B

    84.0

    6-9

    19.0

    2.95

    45

    1600

    4

    MA-90C

    80.0

    6-8

    19.0

    2.90

    45

    1550

    4

     AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

    Close
Last updated: 2024-01-03
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