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High-Quality Zircon Mullite Brick from China Suppliers - Durable Refractories 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
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❓ Frequently Asked Questions
What is zircon mullite brick and what are its main components?
Zircon mullite brick is a high-performance refractory material composed primarily of mullite and zirconium oxide (ZrO₂) particles. The ZrO₂ content ranges from ≥12% to ≥20% depending on the grade, combined with very low Fe₂O₃ (≤0.3%). This unique crystal structure forms a dense, protective matrix that delivers exceptional resistance to high temperatures, chemical erosion, and mechanical stress.
What is the maximum operating temperature of zircon mullite brick?
Our zircon mullite brick can withstand refractoriness under load of up to 1700℃ (0.2MPa, 0.6%) for premium grades, with a minimum of ≥1650℃ for standard grades. The pyrometric cone equivalent reaches SK 31, making it suitable for sustained use in extreme high-temperature industrial furnaces and kilns without deformation or structural failure.
Which industries are best suited for zircon mullite refractory brick?
Zircon mullite brick is widely used across four major industries: the glass industry (lip stones, overflow port side blocks, furnace throats), the ceramic industry (tunnel kilns, shuttle kilns, roller kilns, and 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 preferred refractory solutions for high-heat applications.
How does zircon mullite brick improve glass production efficiency?
The extremely low apparent porosity (≤10–11%) of zircon mullite brick shortens bubble discharge time to less than 5 hours during glass furnace operation. This significantly reduces furnace downtime, improves glass yield, and ensures the purity of molten glass by preventing contamination from bubbles or impurities. Its excellent thermal insulation also stabilizes temperature on both sides of the overflow port for consistent glass rolling molding.
What makes zircon mullite brick more durable than standard refractory bricks?
Zircon mullite brick achieves superior durability through its dense microstructure (bulk density ≥2.90–3.00 g/cm³), high cold crushing strength (≥100 MPa), and the chemical stability of zirconium oxide. These properties collectively provide outstanding resistance to molten glass, acidic/alkaline slags, corrosive gases, molten metal scouring, and thermal shock — significantly extending service life compared to conventional refractory materials.
Can zircon mullite brick handle rapid temperature fluctuations?
Yes. Zircon mullite brick exhibits excellent thermal shock resistance, making it well-suited for applications that involve frequent start-stop cycles and significant temperature fluctuations, such as metallurgical furnaces and ceramic kilns. This property reduces cracking and spalling caused by thermal stress, minimizes maintenance frequency, and ensures continuous, stable production operation over extended periods.