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High-Quality Zircon Mullite Brick from China Suppliers - Durable Refractory Solutions 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
What is the maximum service temperature of zircon mullite brick?
Zircon mullite brick offers a refractoriness under load of up to 1700℃ (0.2MPa, 0.6%) for high-ZrO₂ grades, and at least 1650℃ for standard grades. This makes it suitable for the most demanding high-temperature industrial furnaces, including glass melting furnaces, ceramic kilns, and metallurgical reactors.
What is the ZrO₂ content of zircon mullite brick and how does it affect performance?
Our zircon mullite brick is available in three grades: ZrO₂ ≥20%, ≥16%, and ≥12%. Higher ZrO₂ content delivers greater corrosion resistance, higher bulk density (≥3.00 g/cm³), and improved slag resistance, making it ideal for direct-contact applications with molten glass or aggressive slags. Lower ZrO₂ grades still offer excellent performance at a more economical price point.
Why is low apparent porosity important in zircon mullite refractory brick?
Low apparent porosity (≤10–11%) means the brick has a dense, compact structure with minimal open pores. This prevents molten glass, slag, and corrosive gases from penetrating the brick, dramatically extending service life. In glass production, it also shortens bubble discharge time to under 5 hours, improving glass quality and production efficiency.
In which industries can zircon mullite brick be applied?
Zircon mullite brick is widely used across multiple industries: the glass industry (lip stones, overflow port side blocks, furnace throats), 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 makes it one of the most widely adopted refractory materials for high-temperature applications.
How does zircon mullite brick compare to standard mullite brick?
Compared to standard mullite brick, zircon mullite brick incorporates zirconium oxide (ZrO₂) which significantly enhances corrosion resistance against molten glass, acidic/alkaline slags, and reactive gases. It also achieves higher bulk density, lower apparent porosity, and better thermal shock resistance. These improvements translate directly into longer service life and reduced maintenance costs in demanding industrial environments.
Can zircon mullite brick withstand frequent thermal cycling?
Yes. Zircon mullite brick exhibits excellent thermal shock resistance, making it well-suited for applications involving frequent start-stop cycles and temperature fluctuations — such as metallurgical furnaces, ceramic kilns, and petrochemical reactors. Its stable crystal structure minimizes cracking and spalling during rapid temperature changes, reducing the frequency of maintenance shutdowns and ensuring continuous, reliable production.