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China Suppliers Factory of High-Quality Magnesium Iron Spinel Bricks 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, making them highly suitable for extreme high-temperature industrial applications such as cement rotary kilns, glass furnaces and non-ferrous metal smelting furnaces.
Q
What is the difference between Magnesia-Al Spinel Bricks and Magnesia-Ferro-Spinel Bricks?
Magnesia-Al Spinel Bricks contain Al₂O₃ (12–18%) and are available in various MgO grades (60–80%), offering excellent thermal shock resistance and corrosion resistance. Magnesia-Ferro-Spinel Bricks contain Fe₂O₃ (4–5%) with a higher MgO content (88%), providing superior resistance to erosion from molten slag and alkali environments through the formation of a dense spinel protective layer (MgO·Fe₂O₃).
Q
What industries are Magnesia Spinel Bricks most commonly used in?
Magnesia Spinel Bricks are widely used in the cement industry (rotary kiln burning zone and transition zone), the glass industry (regenerator checkerwork, melting pool sidewall), non-ferrous metal smelting (blast furnaces, electric furnaces, converters), and other high-temperature industrial furnaces including waste incineration boilers, petrochemical cracking furnaces and ceramic kilns.
Q
What is the apparent porosity and bulk density of these bricks?
All grades of Magnesia Spinel Bricks have an apparent porosity of ≤18%, ensuring high density and low permeability. The bulk density ranges from 2.85 g/cm³ to 2.95 g/cm³ depending on the MgO content, with higher MgO grades achieving greater density and mechanical strength.
Q
How do Magnesia Spinel Bricks perform under rapid temperature changes?
Magnesia Spinel Bricks demonstrate excellent thermal shock stability, achieving 40 cycles at 1100°C water cooling tests. Their low thermal expansion coefficient and high thermal conductivity effectively minimize cracking and structural damage caused by rapid temperature fluctuations, significantly extending service life compared to ordinary magnesia bricks.
Q
Can Magnesia Spinel Bricks be customized for specific application requirements?
Yes. We offer multiple grades of Magnesia Spinel Bricks with varying MgO content (60%–88%) and compositions to meet the specific requirements of different industrial processes. Our technical team can recommend the most suitable product based on your working temperature, chemical environment and mechanical load conditions. Please contact us to discuss your specific needs and receive a tailored quote.