Zhengzhou Zhongkeda Refractory Materials Co., Ltd
Magnesium Aluminum Spinel Brick
Magnesium-Alumina Spinel Brick for Cement Rotary Kilns
Designed for high-temperature kiln zones requiring thermal shock resistance, clinker resistance and stable mechanical performance.
• High Thermal Shock Resistance
• Clinker & Chemical Attack Resistance
• Suitable for Burning & Transition Zones
When Do You Need Magnesium-Alumina Spinel Brick?
This refractory is worth considering when your kiln lining is exposed to:
• High operating temperatures
• Frequent thermal cycling
• Clinker and alkali attack
• Mechanical stress
• Repeated kiln start-up and shutdown
• Demanding burning-zone or transition-zone conditions
The right grade depends on the actual kiln zone and operating conditions—not temperature alone.
Where Is Magnesium-Alumina Spinel Brick Used?
• Burning Zone
High temperature + clinker contact + thermal cycling
• Transition Zone
Thermal stress + mechanical stress + chemical attack
• Other High-Temperature Areas
Depending on kiln design and operating conditions
Need help selecting the right zone material? Send us your kiln drawing or operating conditions.
Why Magnesium-Alumina Spinel?
01 Thermal Shock
Kiln linings experience repeated heating and cooling during operation and shutdown.
Spinel-containing refractory structures help improve resistance to thermal shock.
02 Clinker & Chemical Attack
Cement kiln refractories are exposed to clinker, alkalis and other aggressive components.
Magnesia-alumina spinel bricks provide good resistance under these demanding conditions.
03 Mechanical Stability
The lining must withstand mechanical loads and continuous kiln operation.
Proper grade selection helps maintain strength and structural stability at high temperatures.
How to Choose the Right Grade?
Grade selection should be based on kiln zone, thermal cycling, chemical conditions and mechanical requirements.
|
Grade |
MgO |
Al₂O₃ |
Bulk Density |
Best Consideration |
|
MAJ-01 |
≥88% |
≥6% |
2.90 |
High-temperature applications |
|
MAJ-02 |
≥86% |
≥9% |
2.90 |
Balanced performance |
|
MAJ-03 |
≥84% |
≥9% |
2.85 |
General kiln applications |
|
MAJ-04 |
≥82% |
≥8% |
2.80 |
Cost-conscious applications |
|
Contact ZKD for grade recommendation based on your kiln conditions. |
||||
Parameters of Magnesia Alumina Spinel Brick
|
Item |
MAJ-01 |
MAJ-02 |
MAJ-03 |
MAJ-04 |
| MgO,(%)≥ | 88 | 86 | 84 | 82 |
|
Al₂O₃,(%)≥ |
6 | 9 | 9 | 8 |
|
SiО₂,（％）≥ |
0.5 | 0.5 | 0.8 | 1.0 |
|
Bulk density, （g/cm³） |
2.9 | 2.9 | 2.85 | 2.8 |
|
Open porosity,(% )≤ |
18 | 18 | 19 | 20 |
|
Compressive strength, (N/mm²)≥ |
60 | 60 | 50 | 45 |
|
Softening onset temperature, (℃), ≥ |
1700 | 1700 | 1680 | 1650 |
|
Thermal resistance, (times)≥, |
10 | 10 | 10 | 10 |
|
Thermal conductivity, 1000℃, (W/m•K) |
2.9 | 2.9 | 2.8 | 2.7 |
Why Industrial Buyers Work With ZKD Refractory
Factory Direct Supply
Direct communication with the manufacturer from technical confirmation to production.
Technical Grade Selection
We help evaluate material selection according to kiln zone and operating conditions.
Custom Manufacturing
Dimensions and special shapes can be produced according to drawings.
Quality Control
Raw materials, forming, firing and finished products are checked throughout production.
Export Experience
Support for export packaging, documentation and customized labeling.
FAQ
1. What is Magnesium-Alumina Spinel Brick used for?
Magnesium-alumina spinel bricks are mainly used in high-temperature areas of cement rotary kilns and other industrial kilns. They are suitable for applications requiring good thermal shock resistance, clinker resistance and mechanical stability.
2. Where is Magnesium-Alumina Spinel Brick used in a cement kiln?
They can be used in demanding kiln zones such as the burning zone and transition zones, depending on the kiln design and operating conditions. ZKD can recommend a suitable grade based on your specific kiln conditions.
3. What are the main advantages of Magnesium-Alumina Spinel Brick?
The main advantages include good resistance to thermal cycling, clinker and chemical attack, high-temperature stability and good mechanical performance. The actual performance depends on the brick grade and working conditions.
4. How do I choose the right Magnesium-Alumina Spinel Brick grade?
Grade selection should consider the kiln zone, operating temperature, thermal cycling, chemical conditions, mechanical stress and required service life. Instead of selecting a grade based on MgO or Al₂O₃ content alone, we recommend discussing your operating conditions with our technical team.
5. What is the difference between Magnesium-Alumina Spinel Brick and other magnesia-based bricks?
Different magnesia-based refractories are designed for different working conditions. Magnesium-alumina spinel bricks are particularly suitable where thermal shock resistance and stable performance under cement kiln conditions are important. ZKD can help compare suitable materials according to your application.
6. Can Magnesium-Alumina Spinel Bricks be customized?
Yes. We can manufacture standard and special-shaped bricks according to your required dimensions or drawings. Customized shapes, sizes and OEM packaging can also be discussed for project orders.
7. What information should I provide when requesting a quotation?
Please provide the required brick size or drawing, quantity, application, kiln or furnace type, working zone and operating conditions if available. If you are replacing an existing refractory, photos or the current brick specification can also help us recommend a suitable product.
8. Can you recommend the right refractory material for my kiln?
Yes. If you are unsure whether magnesium-alumina spinel brick, high alumina brick, silicon mullite brick or another refractory is more suitable, send us your kiln information and current refractory requirements. Our team can help evaluate the material and grade before quotation.
