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Magnesium Iron Spinel Brick for Cement Rotary Kilns – Quality Refractory Solutions from China Suppliers and Factory
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
What is the maximum working temperature of Magnesia Spinel Bricks?
Magnesia Spinel Bricks can withstand continuous working temperatures up to 1790°C, making them suitable for the most demanding high-temperature industrial applications including cement rotary kilns, glass furnaces and non-ferrous metal smelting furnaces.
What is the difference between Magnesia-Al Spinel Bricks and Magnesia-Ferro-Spinel Bricks?
Magnesia-Al Spinel Bricks use alumina (Al₂O₃) as the spinel-forming component and are available in various MgO contents (60–80%), offering excellent thermal shock resistance. Magnesia-Ferro-Spinel Bricks incorporate Fe₂O₃ (4–5%) to form a MgO·Fe₂O₃ spinel phase, providing a dense protective layer with superior resistance to molten slag and alkali erosion, making them ideal for cement kiln burning zones.
Why do Magnesia Spinel Bricks have better thermal shock resistance than ordinary magnesia bricks?
The incorporation of spinel phases lowers the thermal expansion coefficient and increases thermal conductivity compared to standard magnesia bricks. This combination reduces the internal stress generated by rapid temperature fluctuations, minimizing crack formation and significantly extending service life in environments with frequent thermal cycling.
In which specific zones of a cement rotary kiln are Magnesia Spinel Bricks used?
Magnesia Spinel Bricks are widely applied in the burning zone, transition zone and tertiary air duct of cement rotary kilns. These are the most thermally and chemically aggressive areas, where the bricks must resist clinker, alkali compounds and sulfur-containing gases while maintaining structural stability under continuous high-temperature operation.
What is the apparent porosity and cold crushing strength of these bricks?
All grades of Magnesia Spinel Bricks (both Magnesia-Al Spinel and Magnesia-Ferro-Spinel) feature an apparent porosity of ≤18% and a cold crushing strength of ≥40 MPa. The low porosity ensures high density and resistance to penetration by molten slag and corrosive gases, while the high crushing strength provides durability against mechanical impact during operation.
Can Magnesia Spinel Bricks be used in glass furnace applications?
Yes. Magnesia Spinel Bricks are well-suited for glass furnace applications including the regenerator checkerwork, melting pool sidewall and furnace bottom. They resist high-temperature corrosion from molten glass, prevent contamination of the glass melt, and are compatible with soda-lime glass, borosilicate glass and other glass production processes, helping to maintain product transparency and quality.