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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

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

Last updated: 2024-01-03
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