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Silica Brick | High Temperature Acid Resistant Refractory Brick for Coke Oven & Glass Furnace
1. Product Overview
Silica brick is a professional acidic refractory brick with a silicon dioxide (SiO₂) content of more than 93%, manufactured from high-purity quartzite as the main raw material, matched with special mineralizers and binders, through fine crushing, ingredient mixing, high-pressure molding and high-temperature sintering. Its main mineral components include cristobalite, tridymite and a small amount of residual quartz, featuring stable high-temperature structural performance. Different from alumina-based refractory bricks, silica bricks maintain excellent volume stability and mechanical strength under long-term high-temperature load conditions, making them the preferred refractory material for high-temperature acidic industrial furnaces.
With unique high-temperature resistance and acid slag corrosion resistance, silica bricks avoid structural deformation and spalling of furnace linings in ultra-high temperature environments. They are widely applied in core parts of high-temperature industrial equipment such as coke ovens, glass furnaces, hot blast stoves and ceramic kilns, solving the pain points of poor high-temperature stability and short service life of ordinary refractory materials.
2. Core Performance Characteristics
Excellent High-Temperature Volume Stability Silica bricks have an extremely low permanent linear change rate under continuous high-temperature operation. They will not produce obvious shrinkage or expansion at ultra-high temperatures, effectively ensuring the tightness and integrity of the furnace lining structure, and preventing air leakage and furnace body damage caused by lining deformation.
Superior Acid Slag Corrosion Resistance As a typical acidic refractory material, it shows strong chemical inertness against acidic slag, flue gas and high-temperature acidic corrosive media. It can effectively resist long-term erosion and penetration of acidic substances, maintaining stable structural performance in harsh acidic high-temperature working environments. However, it is not suitable for alkaline working conditions to avoid alkali erosion damage.
High Refractoriness & Hot Strength The refractoriness of qualified silica bricks can reach above SK31 (1700℃), with outstanding high-temperature mechanical strength. It can bear long-term high-temperature load pressure without softening, deformation or collapse, perfectly adapting to the ultra-high temperature working requirements of industrial furnaces.
Stable Thermal Shock Resistance With a reasonable crystal phase structure and low thermal expansion coefficient, silica bricks can withstand frequent temperature changes and thermal shock cycles. It is not easy to crack and peel during furnace start-up, shutdown and temperature fluctuation, greatly extending the service life of furnace linings.
Good Structural Compactness Adopting high-pressure molding and high-temperature firing process, the brick body has uniform texture, high bulk density and low porosity, which can effectively isolate high-temperature heat flow and improve the thermal insulation and energy-saving effect of industrial furnaces.
3. Main Product Types
Standard Coke Oven Silica Brick It is the most conventional type of silica brick, with stable performance and moderate cost. It is mainly used for the masonry of coke oven carbonization chambers, combustion chambers and partition walls, and is suitable for long-term stable high-temperature operation of coke ovens.
Glass Furnace Special Silica Brick Optimized in crystal phase ratio and compactness, this type of brick has better high-temperature transparency and anti-permeability. It is specially used for the crown, vault and upper structural parts of glass melting furnaces to ensure stable glass melting quality.
Hot Blast Stove Silica Brick Featured with stronger high-temperature load resistance and volume stability, it is applicable to high-temperature bearing parts and regenerator areas of hot blast stoves, adapting to long-term high-temperature air heating working conditions.
4. Wide Application Fields
Coking Industry Widely used in coke oven carbonization chambers, combustion chambers, oven doors, partition walls and flue systems, meeting the long-term high-temperature coking production environment.
Glass Manufacturing Industry Mainly used for glass furnace crowns, vaults, regenerators and upper furnace structures, resisting high-temperature flame scouring and acidic glass liquid erosion.
Metallurgical Industry Suitable for high-temperature parts of hot blast stoves, soaking furnaces and open-hearth furnace regenerators, providing stable high-temperature refractory protection for metallurgical equipment.
Building Materials & Ceramic Industry Applied to the high-temperature zones of ceramic firing kilns and lime kilns, adapting to acidic high-temperature firing environments and frequent temperature changes.
5. Construction & Maintenance Notes
Silica bricks shall be masonried with special acidic refractory mortar to ensure bonding tightness and avoid alkaline mortar chemical reaction. During construction, keep the brick joints uniform and dense to prevent slag penetration along the gaps. Strictly control the furnace heating-up curve, avoid rapid temperature rise in the early stage, and fully discharge the internal crystal water to prevent brick body cracking. In daily operation, avoid frequent excessive temperature fluctuation and long-term contact with alkaline substances. Regularly inspect the lining integrity and repair local damage in time to extend the overall service life of the furnace lining.
6. Customized Service
We provide high-quality silica bricks with different SiO₂ content specifications and customized sizes. We can adjust the crystal phase formula and physical indicators according to the actual working temperature, furnace type structure and corrosive environment of customers’ equipment. Meanwhile, we provide professional construction guidance, technical parameter reports and one-stop refractory overall solutions. Welcome customers to consult for samples and formal quotations.
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