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High-Quality Silicon Mullite Brick for Cement Industry - China Factory & Suppliers for Durable Refractory Solutions
Core Advantages
Excellent High-Temperature Performance
The refractoriness is above 1790℃, and the starting temperature of load softening under 0.2MPa is up to 1650℃, which can withstand the high-temperature environment of industrial kilns for a long time without deformation or damage. It is especially suitable for the transition zone and decomposition zone of cement kilns with frequent temperature fluctuations.
Superior Wear & Erosion Resistance
The main crystal phases are corundum, silicon carbide and mullite with high hardness (Mohs hardness up to 9.5), and the product structure is dense. The room-temperature wear resistance is ≤7.8 cm², which can effectively resist the friction and erosion of high-temperature materials and corrosive gases, reducing the loss of kiln linings.
Outstanding Thermal Shock Stability
Thanks to the low thermal expansion coefficient of silicon carbide, the silicon mullite brick has excellent thermal shock resistance. After 15 times of water cooling tests at 1000℃, it still remains intact without cracking or spalling, adapting to the rapid temperature changes in kilns.
Good Thermal Insulation Effect
The thermal conductivity at 1000℃ is ≤1.7 W/(m·k), which is lower than that of alkaline products. It can effectively reduce the surface temperature of the kiln cylinder (lower by more than 50℃ compared with magnesia-aluminum spinel bricks), reduce energy loss and protect the kiln cylinder.
Product Parameters
| Item | Silica Mullite Brick | ||
| SM-1650 | SM-1680 | SM-1680T | |
| Al₂O₃ % | ≥65 | ≥65 | ≥68 |
| SiO₂+SiC % | ≥30 | ≥30 | ≥30 |
| % Apparent Porosity |
≤20 | ≤18 | ≤17 |
| g/cm³ Bulk Density |
≥2.65 | ≥2.65 | ≥2.70 |
| MPa Cold Crushing Strength |
≥95 | ≥90 | ≥90 |
| ℃（0.2MPa,0.6%） Refractoriness Under Load |
≥1650 | ≥1680 | ≥1680 |
| Thermal shock stability （1100℃ cooling) times | ≥10 | ≥12 | ≥15 |
| (1000℃）w/(m.k) Thermal conductivity |
≤2.3 | ≤2.0 | ≤1.7 |
Detailed Application Scenarios
1
Cement Industry (Core Application Field)
◎ As the largest application field of silicon mullite brick, it accounts for more than 38% of the global demand. It is mainly used in key parts of new dry process cement kilns, including the transition zone, decomposition zone, cooling machine and kiln mouth. The transition zone of cement kilns has no kiln skin protection, and is subjected to high temperature (up to 1400℃), material friction and alkaline erosion. Silicon mullite brick can form a continuous SiO₂ dense layer on the surface, which effectively prevents the penetration of molten substances and has excellent corrosion resistance.
2
Metallurgical Industry
◎ It is widely used in ironmaking, steelmaking and non-ferrous metal smelting fields, accounting for about 28% of the market demand. In electric arc furnaces, converter linings, ladles and other equipment, silicon mullite brick can withstand high temperature and strong corrosion of molten metal and slag. Especially with the increase of electric furnace steelmaking ratio, the demand for high-wear and long-life refractory materials is increasing. The high hardness and wear resistance of silicon mullite brick can effectively resist the scouring of molten steel and slag, and its good thermal shock stability can adapt to the rapid temperature rise and fall during smelting, ensuring the safe and stable operation of smelting equipment.
3
Lime Kiln Industry
◎ Lime production process will generate high temperature and strong alkaline substances, which have strong corrosion to kiln linings. Silicon mullite brick has excellent alkali corrosion resistance and thermal shock stability, which can maintain the integrity of the kiln lining structure in the harsh environment of lime kilns. It is mainly used as the inner lining of lime kilns, which can reduce the cracking and spalling of the lining caused by temperature changes and chemical corrosion, and extend the service life of the lime kiln. It is suitable for various types of lime kilns such as shaft kilns and rotary kilns.
4
Power Industry
◎ With the development of new environmental protection power generation methods such as waste incineration and biomass power generation, the furnace environment is more complex and harsh, which provides a new market for silicon mullite brick. It is used in the furnace linings of waste incinerators, biomass boilers and thermal power plant boilers. It can resist the corrosion of harmful gases and high-temperature ash generated during combustion, and has good wear resistance and thermal shock stability. It can ensure the long-term stable operation of power generation equipment and reduce the maintenance cost of power plants.
Conclusion
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Frequently Asked Questions
Q
What is silicon mullite brick and what are its main components?
Silicon mullite brick is a high-performance refractory material whose main crystal phases are corundum, silicon carbide (SiC) and mullite. It typically contains ≥65% Al₂O₃ and ≥30% SiO₂+SiC, combining the high hardness of SiC with the high-temperature stability of corundum and mullite to deliver superior performance in demanding industrial kiln applications.
Q
What is the maximum service temperature of silicon mullite brick?
Silicon mullite brick has a refractoriness above 1790℃. Under a load of 0.2 MPa, the starting temperature of load softening reaches up to 1650℃ (SM-1650 grade) or 1680℃ (SM-1680 / SM-1680T grades), making it suitable for long-term use in high-temperature industrial environments such as cement kiln transition and decomposition zones.
Q
How does silicon mullite brick perform in terms of thermal shock resistance?
Silicon mullite brick exhibits outstanding thermal shock stability. The SM-1680T grade can withstand ≥15 water cooling cycles at 1100℃ without cracking or spalling. This is attributed to the low thermal expansion coefficient of silicon carbide, which effectively buffers rapid temperature changes in kilns and significantly extends lining service life.
Q
In which industries is silicon mullite brick most commonly used?
Silicon mullite brick is most widely used in the cement industry (accounting for over 38% of global demand), particularly in the transition zone, decomposition zone, cooling machine and kiln mouth of new dry process cement kilns. It is also extensively applied in the metallurgical industry (electric arc furnaces, converters, ladles), lime kiln industry (shaft kilns and rotary kilns), and the power industry (waste incinerators, biomass boilers and thermal power boilers).
Q
How does silicon mullite brick help reduce energy consumption in industrial kilns?
Silicon mullite brick has a thermal conductivity of ≤1.7 W/(m·k) at 1000℃, which is lower than that of conventional alkaline refractory products. When used as kiln lining, it can reduce the outer surface temperature of the kiln cylinder by more than 50℃ compared with magnesia-aluminum spinel bricks, thereby significantly reducing heat loss, lowering fuel consumption and protecting the steel kiln shell from thermal damage.
Q
What are the differences between SM-1650, SM-1680 and SM-1680T grades?
The three grades differ primarily in their performance levels. SM-1650 offers a refractoriness under load (RUL) of ≥1650℃ and thermal shock stability of ≥10 cycles. SM-1680 improves RUL to ≥1680℃ with lower apparent porosity (≤18%) and thermal conductivity (≤2.0 W/(m·k)) and ≥12 thermal shock cycles. SM-1680T is the premium grade, featuring Al₂O₃ ≥68%, apparent porosity ≤17%, higher bulk density ≥2.70 g/cm³, and the best thermal shock stability of ≥15 cycles with thermal conductivity ≤1.7 W/(m·k), making it ideal for the most demanding kiln zones.