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China Magnesium Iron Spinel Brick Suppliers - High-Quality Refractory Solutions from Trusted Factory for Cement Rotary Kilns
Core Advantages
Superior High-Temperature Performance
Withstands continuous working temperatures up to 1790°C, maintains structural integrity under extreme heat without deformation, ensuring stable operation in high-temperature industrial processes.
Excellent Corrosion & Erosion Resistance
The spinel phase (MgO·Fe₂O₃) forms a dense protective layer, effectively resisting erosion from molten slag, alkali metals and corrosive gases in kilns and furnaces.
Strong Thermal Shock Stability
Low thermal expansion coefficient and high thermal conductivity reduce damage caused by rapid temperature changes, minimizing cracking and extending service life compared to ordinary magnesia bricks.
High Density & Mechanical Strength
Sintered at high temperature with advanced technology, the brick has low porosity (≤18%) resisting mechanical impact and wear during operation.
Product Parameters
| Item | Magnesia-Al Spinel Bricks | Magnesia-Ferro-Spinel Bricks | |||
| MgO % | 80 | 75 | 70 | 60 | 88 |
| Fe₂O₃ % | / | / | / | / | 4–5 |
| Al₂O₃ % | 12 | 12 | 12 | 18 | / |
| SiO₂ % | 1.0 | 1.0 | 1.5 | 1.0 | 1.2 |
| Apparent Porosity % | 18 | 18 | 18 | 18 | 18 |
| Bulk Density g/cm³ | 2.95 | 2.90 | 2.90 | 2.85 | 2.95 |
| Cold Crushing Strength MPa | 40 | 40 | 40 | 40 | 40 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | 1650 | 1650 | 1650 | 1650 | 1650 |
| Thermal Shock Stability (1100℃ cooling) times | 40 | 40 | 40 | 40 | 40 |
Detailed Application Scenarios
1
Cement Industry
◎ Widely used in the burning zone, transition zone and tertiary air duct of cement rotary kilns. Resists erosion from clinker, alkali and sulfur-containing gases, improves kiln operation stability and reduces downtime for brick replacement. Suitable for new dry-process cement production lines with high production efficiency.
2
Glass Industry
◎ Applied to the regenerator checkerwork, melting pool sidewall and bottom of glass furnaces. Withstands high temperature and corrosion from molten glass, prevents glass liquid pollution, and ensures the transparency and quality of glass products. Compatible with soda-lime glass, borosilicate glass and other production processes.
3
Non-Ferrous Metal Smelting
◎ Used in the lining of blast furnaces, electric furnaces and converter for smelting copper, aluminum, zinc and other non-ferrous metals. Resists erosion from molten metal, slag and flue gas, maintains the integrity of smelting equipment, and improves smelting efficiency and product purity.
4
Other High-Temperature Industrial Furnaces
◎ Suitable for waste incineration boilers, petrochemical cracking furnaces, ceramic kilns and refractory cement kilns. Adaptable to harsh working environments with high temperature, corrosion and thermal shock, providing reliable refractory protection for various industrial production.
Conclusion
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
Q
What is the maximum working temperature of Magnesia Spinel Bricks?
Magnesia Spinel Bricks can withstand continuous working temperatures up to 1790°C. They maintain structural integrity and dimensional stability under extreme heat, making them ideal for the most demanding high-temperature industrial applications such as cement rotary kilns and glass furnaces.
Q
What is the difference between Magnesia-Al Spinel Bricks and Magnesia-Ferro-Spinel Bricks?
Magnesia-Al Spinel Bricks incorporate alumina (Al₂O₃) as the spinel-forming component, offering excellent thermal shock resistance and broad chemical compatibility. Magnesia-Ferro-Spinel Bricks use iron oxide (Fe₂O₃) to form the MgO·Fe₂O₃ spinel phase, which creates a particularly dense protective layer that excels at resisting molten slag and alkali erosion. The choice depends on the specific application and chemical environment.
Q
Which industries are Magnesia Spinel Bricks most commonly used in?
These bricks are widely used across multiple high-temperature industries, including cement manufacturing (rotary kiln burning zones), glass production (regenerator checkerwork and melting pool), non-ferrous metal smelting (copper, aluminum, zinc furnaces), as well as waste incineration boilers, petrochemical cracking furnaces, and ceramic kilns.
Q
How does the low porosity of Magnesia Spinel Bricks benefit industrial operations?
With an apparent porosity of ≤18% achieved through high-temperature sintering with advanced technology, the bricks exhibit high bulk density (up to 2.95 g/cm³) and superior cold crushing strength (≥40 MPa). This low porosity minimizes penetration by molten slag and corrosive gases, significantly extending service life and reducing maintenance downtime.
Q
How do Magnesia Spinel Bricks compare to ordinary magnesia bricks in thermal shock resistance?
Magnesia Spinel Bricks significantly outperform ordinary magnesia bricks in thermal shock resistance, achieving 40 thermal shock cycles (at 1100°C water cooling) compared to far fewer cycles for standard products. This is due to their lower thermal expansion coefficient and higher thermal conductivity, which together reduce internal stress during rapid temperature fluctuations and minimize cracking.
Q
Can Magnesia Spinel Bricks be customized for specific project requirements?
Yes. We offer Magnesia Spinel Bricks in various MgO content grades (60%–88%) and compositions to match your specific furnace design, operating temperature, and chemical environment. Custom shapes, sizes and performance specifications are available. Please contact our technical team with your project details to receive a tailored solution and accurate quotation.