Home Brick for Cement/Lime Kiln Magnesia Hercynite Brick for Cement/Lime Kiln

Magnesia Hercynite Brick for Cement/Lime Kiln

Magnesia Hercynite Brick for Cement/Lime Kiln (MH) made of magnesite and hercynite, processed by high temperature sintering. It was widely used both in burning and transition zone. It can reduce the standby inventory and thus lower cost. It is good in clinker coating and resistance to thermal shock. Clinker coating can form rapidly and stably. The coating doesn’t fall easily and thus it reduce the kiln proper temperature. It is excellent in resistance to chemical corrosion, overheat damage, oxidation reduction without conditions such as alkali cracking or loosening. It is good in resistance to thermal load fatigue, especially in high temperature mechanical flexibility and wearing resistance. It is the best choice to be used at kiln tire areas.
Magnesite Hercynite is mainly composed of MgO-Fe2O3-Al2O3 spinel and periclase.

Magnesia Hercynite Brick, a critical component in modern refractory technology, offer significant advantages in both cement and lime kilns. Their unique composition and properties address several key operational challenges in these high-temperature environments.

 

Magnesia Hercynite brick In Cement Kilns

Composition and Manufacturing:

  • Magnesia Hercynite brick spinel bricks are typically made from high-purity magnesia sand and aluminum-iron spinel sand. The process involves careful gradation, high-pressure molding, and strict control over firing temperature and atmosphere.
  • These bricks have emerged as a chromium-free alternative to traditional magnesia-chrome bricks, offering an environmentally friendly solution​​.

Properties and Performance:

  • They display high compressive strength, excellent thermal shock stability, and resistance to thermal creep.
  • The bricks are highly resistant to erosion and penetration, with a high load softening temperature.
  • They also provide better adhesion for the kiln skin, which is crucial in preventing environmental pollution from hexavalent chromium, a byproduct of magnesia-chrome brick usage​​.
  • Key benefits include good anti-erosion performance, rapid and stable kiln skin formation, and enhanced resistance to temperature fluctuations in cement kilns. Their low thermal conductivity also leads to significant energy savings​​.

 

Magnesia Hercynite brick In Lime Kilns

While specific details on the application of Magnesia Hercynite brick in lime kilns are less readily available, it can be inferred from their properties and performance in cement kilns that similar benefits would apply. These would include high thermal resistance, environmental safety, and energy efficiency.

 

Magnesia Hercynite Brick Advantages Over Other Refractories:

In Cement Kilns:

  • Magnesia Hercynite brick are being increasingly used in high-temperature zones of cement rotary kilns due to their structural flexibility and excellent kiln skin hanging performance​​.
  • They form a highly viscous layer on the hot surface, improving kiln skin performance and durability. The addition of fused iron-aluminum spinel composite imparts high strength and thermal shock resistance, effectively resisting chemical erosion from cement clinker liquids and gases like alkali and sulfur​​.
  • The mismatch in thermal expansion between spinel and periclase creates micro-cracks that buffer stress from temperature changes, preventing brittle explosions of the lining bricks​​.
  • The bricks are chrome-free, aligning with modern environmental standards​​.

 

In summary, Magnesia Hercynite brick represent a significant advancement in refractory materials for high-temperature industrial applications. Their use in cement and, potentially, lime kilns, underscores the ongoing evolution in refractory technology to meet the demanding conditions of modern industrial processes. These bricks not only enhance operational efficiency and safety but also contribute to environmental sustainability by eliminating harmful byproducts associated with older refractory materials.

 
Magnesia Hercynite brick  Magnesia Hercynite brick

Magnesia Hercynite brick  Magnesia Hercynite brick  

In the process of use Magnesia Hercynite Brick for Cement/Lime Kiln, the hot surface of the brick forms a layer of calcium iron or calcium-aluminum-iron oxide with high viscosity, which improves the performance of clinker coating and the firmness of coating, and is suitable for extending the service life of the protective lining brick.

Due to the inconsistent thermal expansion between spinel and periclase during firing and cooling, the microcracks formed between them can buffer the stress impact caused by temperature changes and avoid the brittle cracking of lining bricks.

HERCYNITE, “Active Spinel”, provides excellent physical and chemical features to bricks

High ductility (fracture-mechanical strength) and flexibility against cracking and spalling

 Extreme high strength against spalling from mechanical stress(ovality, shell deformation, tyre areas, thermo-shock etc.)

Excellent coating formation, during operation, Hercynite brick could form very stable coating and hold it In the form of brownmillerite with clinker melt phase, this performance is not comparable by conventional CMAS brick.

Excellent chemical resistance against alkalis, sulphat, chlorine, clinker phases etc

Excellent thermals strength(refractoriess)

%E4%B8%8B%E8%BD%BD We can produce Harbinson Walker International standard Magnesia Hercynite Brick for Cement/Lime Kiln

rhimagnesita We can produce RHI Magnesita standard Magnesia Hercynite Brick for Cement/Lime Kiln

Refrateknik1 We can produce Refratechnik standard Magnesia Hercynite Brick for Cement/Lime Kiln, such as:

PG 90
FERROMAGS

OSYMEN

MgO

Fe2O3
+SiO2

AP

BD

CCS

RUL

TSR

950°C Air

TE

1100°C

%

%

%

g/cm3

MPa

(Ta)°C

Cycles

%

MH-8AX

89.0

6-12

15.0

3.00

70

>1700

>100

1.18

MH-8AS

88.0

6-12

16.0

2.98

70

>1700

>100

1.18

MH-8A

87.0

6-12

16.5

2.96

65

>1700

>100

1.18

MH-8B

86.0

6-12

17.0

2.92

60

>1680

>90

1.18

MH-10AX

88.0

7-12

15.0

3.01

70

>1700

>100

1.18

MH-10AS

87.0

7-12

16.0

2.99

70

>1700

>100

1.18

MH-10A

86.0

7-12

16.0

2.97

65

>1700

>100

1.18

MH-10B

85.0

7-12

17.0

2.92

60

>1680

>90

1.18

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

Products

Last updated: 2024-01-03
TOPTOP
print
CopyRight © www.osymen.com All Rights Reserved.