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High-Quality Zircon Mullite Brick from China Suppliers - Durable Refractory Factory for Industrial High-Temp Applications
Core Advantages
Superior High-Temperature Stability
With refractoriness under load up to 1650℃ and pyrometric cone equivalent of SK 31, our zircon mullite brick maintains structural integrity and stable performance in extreme high-temperature industrial environments, avoiding deformation or damage during long-term continuous operation. This high-temperature stability makes the zircon mullite refractory brick an ideal choice for high-heat industrial furnaces.
Strong Erosion & Slag Resistance
The unique crystal structure of our zircon mullite brick, composed of mullite and zirconium oxide particles, forms a dense protective layer. This layer resists penetration and erosion of molten glass, acidic/alkaline slags and corrosive gases, making the zircon mullite refractory brick highly durable and extending its service life in harsh industrial settings.
Low Apparent Porosity & High Bulk Density
Our zircon mullite brick bulk density ≥2.9 g/cm³. This low porosity and high density shorten bubble discharge time during furnace operation, improve production efficiency and product yield. The zircon mullite refractory brick's dense structure also enhances its overall mechanical performance.
Product Parameters
| Item | Zircon Mullite Brick | ||
| ZrO₂ % | ≥20 | ≥16 | ≥12 |
| Fe₂O₃ % | ≤0.3 | ≤0.3 | ≤0.3 |
| Bulk Density (g/cm³) | ≥3.00 | ≥2.90 | ≥2.90 |
| Apparent Porosity (%) | ≤10 | ≤11 | ≤11 |
| Cold Crushing Strength (MPa) | ≥100 | ≥100 | ≥100 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥1700 | ≥1700 | ≥1650 |
Detailed Application Scenarios
1
Glass Industry
◎ As a core refractory material for glass production lines, zircon mullite brick is widely used in key parts that are in direct contact with molten glass, such as photovoltaic ultra-white glass rolling production line lip stones, overflow port side blocks, furnace throat, and weir. Our zircon mullite brick's extremely low apparent porosity shortens bubble discharge time to less than 5 hours, reducing furnace downtime and improving glass yield. The excellent corrosion resistance and low pollution performance of this zircon mullite refractory brick ensure the purity of molten glass, avoiding defects such as bubbles and impurities in glass products. Meanwhile, its good thermal insulation performance reduces temperature loss on both sides of the overflow port, ensuring stable glass rolling molding.
2
Ceramic Industry
◎ In ceramic firing processes, zircon mullite brick is suitable for high-temperature zones of tunnel kilns, shuttle kilns, and roller kilns, as well as kiln furniture such as shelves and posts. Our zircon mullite brick can withstand the high temperature environment above 1600℃ and frequent temperature changes during ceramic firing, and has strong resistance to erosion by ceramic glazes and fluxes. The high mechanical strength of this zircon mullite refractory brick ensures that it is not easily damaged during stacking and use, extending the service life of kiln furniture and reducing production costs for ceramic enterprises.
3
Metallurgical Industry
◎ In metallurgical production, zircon mullite brick is used in linings of steel ladles, tundishes, and intermediate frequency furnaces, as well as high-temperature flue ducts and combustion chambers. Our zircon mullite brick can resist erosion and scouring by molten steel, slag, and high-temperature flue gas, and maintain stable structural performance under high temperature and high pressure conditions. The good thermal shock resistance of this zircon mullite refractory brick adapts to the frequent start-stop and temperature fluctuation of metallurgical furnaces, reducing the number of maintenance and ensuring continuous production of metallurgical processes.
4
Petrochemical Industry
◎ In petrochemical equipment such as crackers, carbon black reactors, and gasifiers, zircon mullite brick is used as a lining material for high-temperature reaction zones. Our zircon mullite brick can withstand the corrosion of high-temperature hydrocarbons, acidic and alkaline media, and has excellent thermal stability and mechanical strength. This zircon mullite refractory brick effectively isolates the high-temperature reaction zone from the equipment shell, preventing equipment deformation and damage, and ensuring safe and stable operation of petrochemical 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 zircon mullite brick, and what are its main chemical components?
Zircon mullite brick is a high-performance refractory material primarily composed of mullite (Al₆Si₂O₁₃) and zirconium dioxide (ZrO₂). Depending on the grade, ZrO₂ content ranges from ≥12% to ≥20%, while Fe₂O₃ is strictly controlled to ≤0.3% to ensure low contamination and high purity in industrial applications.
Q
What is the maximum service temperature of zircon mullite brick?
Our zircon mullite brick offers a refractoriness under load (0.2 MPa, 0.6% deformation) of up to ≥1700℃ for higher-grade variants, with the standard grade rated at ≥1650℃. The pyrometric cone equivalent reaches SK 31, making it suitable for sustained operation in extreme high-temperature industrial furnaces and kilns.
Q
Why is zircon mullite brick preferred over standard mullite brick in glass production?
The addition of ZrO₂ to the mullite matrix significantly enhances resistance to corrosion by molten glass and reduces contamination risk. The extremely low apparent porosity (≤10–11%) of zircon mullite brick shortens bubble discharge time to under 5 hours, improving glass yield and product purity. Its dense structure also provides superior thermal insulation and dimensional stability compared to standard mullite brick.
Q
In which industries can zircon mullite brick be used?
Zircon mullite brick is widely applied across multiple high-temperature industries, including the glass industry (overflow production lines, furnace throats, lip stones), the ceramic industry (tunnel kilns, shuttle kilns, roller kilns, kiln furniture), the metallurgical industry (steel ladles, tundishes, intermediate frequency furnaces), and the petrochemical industry (crackers, carbon black reactors, gasifiers). Its versatility stems from its combined properties of high-temperature stability, erosion resistance, and strong mechanical strength.
Q
What is the cold crushing strength and bulk density of your zircon mullite brick?
Our zircon mullite brick achieves a cold crushing strength of ≥100 MPa across all grades, ensuring excellent resistance to mechanical stress during installation and operation. The bulk density is ≥2.90 g/cm³ (standard grade) and ≥3.00 g/cm³ (premium grade), reflecting the dense microstructure that contributes to the brick's outstanding durability and mechanical performance.
Q
How do I select the right grade of zircon mullite brick for my application?
Grade selection depends primarily on the operating temperature, the type of corrosive media present, and the required service life. For applications involving direct contact with molten glass or aggressive slags at temperatures above 1700℃, the premium grade (ZrO₂ ≥20%, bulk density ≥3.00 g/cm³) is recommended. For standard high-temperature applications in ceramics or metallurgy, grades with ZrO₂ ≥12–16% offer an excellent balance of performance and cost. Please contact us directly to receive a tailored product recommendation for your specific process requirements.