High alumina bricks, also known as high alumina refractory bricks, are a type of refractory material with a very hard exterior and a smooth surface.
Neutral refractory: A neutral refractory with an alumina content of 48% or more. It is formed by bauxite or other raw materials with higher alumina content. High thermal stability and refractoriness above 1770 °C. Good slag resistance. Used for laying linings for steelmaking electric furnaces, glass furnaces, cement rotary furnaces, etc.
Advanced refractory: high and soft. Low creep high alumina brick is a special grade bauxite. The refractory material made of fused corundum and fused mullite is the main raw material. This product has low temperature creep. Strong resistance to erosion. It has the advantages of good thermal shock stability and is suitable for large and medium-sized hot blast stoves. It has opened up a successful road for the localization of high-quality and high-grade imported refractory materials required for China’s new hot blast stoves. It has been included in the national “Spark Program”. “project.
Mainly used for masonry blast furnace, hot blast stove, electric furnace top, blast furnace, reverberatory furnace, rotary kiln lining. In addition, high-aluminum bricks are also widely used as open-hearth regenerative lattice bricks, plugs for sprue systems, nozzle bricks, and the like. However, the price of high alumina bricks is higher than that of clay bricks, so it is not necessary to use high alumina bricks where clay bricks can meet the requirements. (The shape is similar to that of the clinker, but the ingredients are different.)
The high alumina bricks have higher refractoriness than clay bricks and semi-silica bricks, reaching 1750~1790 °C, which is a high-grade refractory material.
Load softening temperature
Because high Al2O3 has high Al2O3, low impurity content and less fusible glass body, the load softening temperature is higher than that of clay brick. However, since the mullite crystal does not form a network structure, the load softening temperature is still not high.
High alumina bricks contain more Al2O3, close to neutral refractory materials, and can resist the erosion of acid slag and alkaline slag. Because of the SiO2 content, the ability to resist alkaline slag is weaker than that of acid slag.
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