Zhengzhou Zhongkeda Refractory Materials Co., Ltd
Magnesium Aluminum Spinel Brick
Magnesia-Alumina Spinel Bricks - High-Performance Refractory Solution for Cement & Steel Industries
Magnesia-Alumina Spinel Brick is a refractory material made from high-purity magnesia (MgO) and synthetic magnesia-alumina spinel (MgAl₂O₄) as the main raw materials. It is sintered at ultra-high temperatures above 1800°C in a tunnel kiln. Its primary mineral phase is magnesia-alumina spinel , which features a unique crystal structure and high stability.
Characters of Magnesia-Alumina Spinel Bricks:
✅ Excellent resistance to thermal shock and spalling
✅ Superior corrosion resistance to basic slags and alkalis
✅ High refractoriness under load (RUL)
✅ Stable structure at high temperatures
✅ Long service life in harsh furnace conditions
Typical Applications of Magnesia-Alumina Spinel Bricks：
•🔥Transition and burning zones of cement rotary kilns
Designed for extreme conditions in cement rotary kiln transition/burning zones, resistant to temperatures exceeding 1600°C and alkali erosion.
•⚙️Steel ladles, tundish linings, RH degassing systems
Full-process steelmaking protection: Steel ladle linings withstand molten steel erosion, tundish resists slag corrosion, and RH degassing systems combat thermal shock.
•🏭Lime kilns and non-ferrous metal furnaces
Engineered for lime kiln calcination zones and non-ferrous metal (Cu/Al) smelting furnaces, balancing thermal conductivity with resistance to CO/sulfide corrosion.
•⚡Secondary refining equipment
Dedicated refractory solutions for LF/AOD furnaces, ensuring stability and longevity in low-oxygen refining environments.
Parameters of Magnesia-Alumina Spinel Brick:
FAQ:
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
Q: Can you customize the brick size, shape, or chemical composition?
A: Yes, we offer complete customization services, including special shapes, dimensions, and formulations tailored to your specific furnace and process requirements.
Q: What is your Minimum Order Quantity (MOQ)?
A: Our standard MOQ is 10 tons, but we are open to smaller trial orders for first-time cooperation or new project developments.
Q: How do you package the bricks for shipment?
A: Bricks are securely packed in seaworthy wooden pallets or crates, protected with waterproof wrapping to ensure safe delivery even over long distances.
Q: How long does production and delivery usually take?
A: Production typically takes 20–35 days after order confirmation, depending on the order size and customization details.
Q: Can you provide technical installation support?
A: Absolutely. We offer installation guidance, lining design advice, and technical support throughout the project to help you achieve the best performance.
Q: Can I request a sample before placing a bulk order?
A: Yes, samples are available upon request. Shipping charges for samples are typically paid by the buyer.
Q: Do your products have quality certifications?
A: Yes. All products are manufactured under strict quality control systems and can be supplied with ISO certifications, chemical analysis reports, and third-party inspection certificates if needed.
