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High-Quality Magnesium Iron Spinel Brick for Cement Rotary Kilns - China Suppliers & 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 (FAQ)
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Q What is the maximum working temperature of Magnesia Spinel Bricks?Magnesia Spinel Bricks can withstand continuous working temperatures up to 1790°C, maintaining structural integrity under extreme heat without deformation. This makes them ideal for the most demanding high-temperature industrial environments such as cement rotary kilns and glass furnaces.
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Q 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, offering excellent thermal shock resistance and are available in various MgO grades (60%–80%). Magnesia-Ferro-Spinel Bricks incorporate iron oxide (Fe₂O₃, 4–5%) to form a MgO·Fe₂O₃ spinel phase, providing a denser protective layer with superior resistance to molten slag and alkali erosion, with a higher MgO content of 88%.
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Q In which industries are Magnesia Spinel Bricks most commonly used?Magnesia Spinel Bricks are widely used across multiple high-temperature industries, including: cement rotary kilns (burning zone, transition zone, tertiary air duct), glass furnaces (regenerator checkerwork, melting pool sidewall), non-ferrous metal smelting furnaces (copper, aluminum, zinc), as well as waste incineration boilers, petrochemical cracking furnaces, and ceramic kilns.
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Q What are the key physical properties of Magnesia Spinel Bricks?Key physical properties include: Apparent Porosity ≤18%, Bulk Density of 2.85–2.95 g/cm³, Cold Crushing Strength ≥40 MPa, Refractoriness Under Load (0.2MPa, 0.6%) at 1650°C, and Thermal Shock Stability (1100°C water cooling) of ≥40 cycles. These properties ensure high mechanical strength and long service life.
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Q How do Magnesia Spinel Bricks improve thermal shock resistance compared to ordinary magnesia bricks?The incorporation of spinel (MgAl₂O₄ or MgO·Fe₂O₃) into the magnesia matrix results in a lower thermal expansion coefficient and higher thermal conductivity. This combination effectively absorbs and distributes thermal stress during rapid temperature fluctuations, significantly reducing cracking and spalling, and extending service life compared to standard magnesia bricks.
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Q Can Magnesia Spinel Bricks be customized for specific application requirements?Yes. Magnesia Spinel Bricks are available in multiple MgO content grades (60%, 70%, 75%, 80% for Al-Spinel; 88% for Ferro-Spinel) to suit different temperature and corrosion resistance requirements. Custom shapes, dimensions and chemical compositions can be produced to meet the specific demands of cement, glass, non-ferrous metal smelting and other high-temperature industrial applications. Please contact us with your technical specifications for a tailored solution.