Silica Brick

Sillimanite is a natural high-grade refractory mineral with the characteristics of low thermal expansion, resistance to corrosion by metallurgical slag and various glass liquids, and good high-temperature wear resistance. Its physical and chemical properties are better than those of high-alumina bricks, with a refractoriness of 1770-1830℃ and a load softening starting point of 1500-1650℃. It is mainly used for the forming of flow holes in glass tank kilns, blast furnace linings, furnace throats, and ceramic industrial kiln furniture. Refractory materials based on natural sillimanite also have these advantages. Therefore, sillimanite refractory materials are widely used in metallurgy, chemical industry, building materials and other industries.

Silicon bricks, also known as silica bricks or silicon carbide bricks, are a type of refractory material commonly used in glass kilns and other high-temperature applications. They are made primarily from silica (SiO2), which is a key component of sand and quartz.

It is mainly used for the partition walls of the carbonization chamber and combustion chamber of coke ovens, the regenerators and slag chambers of steel-making open-hearth furnaces, soaking furnaces, refractory materials of glass melting furnaces and ceramic firing kilns, and other kiln vaults. Load-bearing parts. It is also used in high-temperature load-bearing parts of hot blast furnaces and acidic open-hearth furnace tops.

Refractory magnesia brick, often referred to as magnesite brick or magnesia refractory brick, is a type of refractory material made primarily from magnesia (magnesium oxide, MgO) as the main component. Magnesia bricks are known for their high refractoriness and excellent resistance to high temperatures.

Low-creep clay bricks are now one of the commonly used refractory bricks in blast furnaces and hot blast furnaces, and as the wind temperature increases, the creep resistance of clay bricks increases. Low creep clay bricks are made of coke clinker with dense structure and high initial. And a few impurities as the main raw material, adding part of synthetic mullite and trilithon raw materials to configure into clay, which will be formed under high pressure, dried and fired at high temperature.

Silica brick is an acidic refractory material mainly composed of tridymite, cristobalite and a small amount of residual quartz and glass phases. Silica content is more than 94%. True density 2.35g/cm3. Resistant to acidic slag erosion. Higher high temperature strength. The load softening starting temperature is 1620~1670℃. It will not deform after long-term use at high temperatures. Thermal shock stability is low (heat exchange in water is 1 to 4 times). It uses natural silica as raw material, plus an appropriate amount of mineralizing agent to promote the transformation of quartz in the green body into tridymite. It is slowly fired at 1350~1430℃ in a reducing atmosphere. When heated to 1450°C, there will be a total volume expansion of about 1.5~2.2%. This residual expansion will make the seams close and ensure good air tightness and structural strength of the masonry.

It is mainly used in high-temperature areas such as the top of the blast furnace hot blast furnace, the upper furnace body and the upper grid body.

Silica bricks for coke ovens are siliceous refractory products with tridymite as the main crystal phase used for building coke ovens. Modern coke ovens are large-scale thermal equipment built with tens of thousands of tons of refractory materials and nearly a thousand brick types, of which silica bricks account for 60% to 70%. Coke oven silica bricks are used to build coke oven regenerator walls, ramps, combustion chambers, carbonization chambers and furnace roofs, etc.