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High Alumina Bricks

High Alumina Bricksrefer to the bricks that contain more than 45 percent alumina (Al2O3). The raw materials for such fire brick are industrial alumina and electrolytically produced corundum, with the addition of refractory clay, as well as rock that has a high alumina content (cyanite, andalusite, diaspore, bauxite, and others). High-alumina refractory bricks are pressed from powders as coarse as 3mm under a pressure of 60-120 meganewtons per sq m (600-1,200 kilograms-force per sq cm) and are fired at a temperature of 1500°-1750° C.
High-aluminarefractory bricks are used for walling thermal units (having temperatures higher than 1300°-1400° C) in blast furnaces, air heaters, and chemical reactors.



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