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High-Quality Silica Brick from China Suppliers - Factory-Made Acidic Refractories for Industrial Furnaces
Core Advantages
High Silicon Content & Premium Purity
SiO₂ content ranges from 94% to 96%, with extremely low harmful impurities (Fe₂O₃ ≤1.5%). The high purity ensures excellent refractory performance and minimizes pollution to molten materials such as glass liquid.
Exceptional High-Temperature Resistance
Load softening temperature reaches 1640–1680℃, close to the melting point of tridymite and cristobalite. It can maintain structural integrity and no deformation under long-term high-temperature and high-load conditions.
Strong Acid Corrosion Resistance
As an acidic refractory material, it has strong resistance to acid slag and acidic gas erosion, and performs significantly better than clay bricks and ordinary high-alumina bricks in acidic working environments.
Stable High-Temperature Volume
After special firing process, the main mineral composition is tridymite and cristobalite. The residual expansion is small (0–0.2% at 1450℃×2h), which can make the masonry joints tight and ensure good airtightness.
Excellent Thermal Conductivity
Thermal conductivity is higher than that of clay bricks and high-alumina bricks, which is conducive to rapid heat storage and heat release of furnace equipment, improving energy utilization efficiency.
Product Parameters
| Item | Silica Brick | |||
| BG-94 | BG-95 | BG-96A | BG-96B | |
| SiO₂ % | ≥94 | ≥95 | ≥96 | ≥96 |
| Fe₂O₃ % | ≤1.50 | ≤1.50 | ≤0.80 | ≤0.70 |
| Apparent Porosity % | ≤22 | ≤21 | ≤21 | ≤21 |
| True Density g/cm³ | ≤2.38 | ≤2.38 | ≤2.34 | ≤2.34 |
| Cold Crushing Strength MPa | ≥25 | ≥29 | ≥35 | ≥35 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥1630 | ≥1650 | ≥1680 | ≥1680 |
Detailed Application Scenarios
1 Coke Oven Application
◎ Silica brick is the core refractory material for modern large-scale coke ovens, which is used in key parts such as regenerator walls, slopes, carbonization chamber bottoms, furnace walls, and furnace tops. Coke ovens need to operate continuously at 950–1050℃ for dry distillation of coal. The high temperature resistance, stable volume, and good thermal conductivity of silica brick can increase the temperature of the combustion chamber, shorten the coking time, improve the production capacity of the coke oven, and extend the service life of the coke oven to more than 20 years. It is especially suitable for large coke ovens with carbonization chamber height above 6m.
2 Glass Furnace Application
◎ Silica brick is the most widely used and important brick type in float glass furnaces, mainly used in the melting section, working section roof swan, breast wall, front and rear end walls, regenerator top swan, and regenerator upper partition wall. The glass furnace gas temperature can reach above 1615℃, and the silica brick can withstand gravity, mechanical stress and high temperature load. It has slight erosion after absorbing a small amount of alkali components, which will not reduce the structural strength of the furnace top. At the same time, its low impurity content (Fe₂O₃ ≤0.8%) can avoid polluting the glass liquid and ensure the quality of glass products.
3 Hot Blast Furnace Application
◎ Silica brick is used for masonry of high-temperature parts of blast furnace hot blast furnaces. Under the working conditions of long-term high temperature and high air pressure, it has stable volume and low creep rate, and can be used continuously for 1–2 blast furnace generations. Its excellent thermal conductivity is conducive to rapid heat storage and heat release, improving the temperature of hot air and the thermal efficiency of the blast furnace. It is suitable for the high-temperature bearing parts of hot blast furnaces and acidic blast furnace tops.
We provide customized services for different furnace types and working conditions to meet the personalized needs of customers. With professional R&D team and after-sales service system, we are committed to providing customers with high-quality silica brick products and comprehensive technical support.
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 the SiO₂ content range of your silica bricks?
Our silica bricks offer SiO₂ content ranging from 94% to 96% depending on the grade selected (BG-94, BG-95, BG-96A, BG-96B). Higher SiO₂ content grades also feature lower Fe₂O₃ impurity levels, ensuring superior purity and refractory performance for demanding applications.
Q
What is the maximum service temperature for your silica bricks?
The refractoriness under load (0.2 MPa, 0.6%) for our premium grades BG-96A and BG-96B reaches ≥1680℃. The load softening temperature of our silica bricks ranges from 1640℃ to 1680℃, making them suitable for extreme high-temperature environments such as glass furnaces operating above 1615℃.
Q
Which industries are silica bricks most commonly used in?
Silica bricks are widely used in three major high-temperature industries: coke ovens (regenerator walls, carbonization chambers), float glass furnaces (melting sections, roof structures, breast walls), and hot blast furnaces in the steel industry. They are also applicable in ceramic kilns, electric arc furnaces, and other acidic refractory environments.
Q
Why is silica brick preferred over clay or high-alumina brick in glass furnaces?
Silica brick is preferred in glass furnaces because its low Fe₂O₃ content (≤0.8% in BG-96A/B grades) prevents iron contamination of the glass melt, ensuring product quality. Additionally, its stable volume at high temperatures, ability to withstand mechanical and thermal stress above 1615℃, and resistance to alkali erosion without structural weakening make it the optimal choice for glass furnace applications.
Q
Do you offer customized silica brick solutions for specific furnace types?
Yes, we provide fully customized silica brick services tailored to different furnace types, working conditions, and load requirements. Our professional R&D team works closely with customers to design and supply silica bricks that meet specific dimensional, chemical, and mechanical specifications, supported by comprehensive after-sales technical assistance.
Q
How does the thermal conductivity of silica brick benefit furnace performance?
Silica brick has higher thermal conductivity compared to clay bricks and high-alumina bricks. This allows furnace equipment to store and release heat more rapidly, improving the overall thermal efficiency of the furnace. In hot blast furnaces, this translates directly to higher hot air temperatures and better blast furnace productivity, reducing energy consumption and operating costs.