Brown Fused Alumina Type
Brown Fused Alumina, the name is also called Brown corundum , with three kinds of raw materials alumina, carbon material and scrap iron in arc furnace melting reduction and made of brown alumina. The main chemical composition of brown fused alumina is AL2O3, its content is 95%-97%, and the others contain a small amount like Fe, Si, Ti, etc.. Brown fused alumina is the most basic material, because of its good grinding performance, wide application range and low price, so that it is used widely.
According to the chemical composition to distinguish, BFA can be divided into Grade one, grade two and Lower Grade.
The content of Al2O3 in Grade one is more than 95%. Brown corundum is made by the high-quality bauxite, a carborundum iron and anthracite mixed according to proportion in arc furnace with high temperature electric melting crystallization. It has high hardness, good toughness, high strength, sharp edges, and high temperature refractory characteristics, so that it can be widely used in grinding wheel manufacturing, production of refractory materials, emery cloth sandpaper, iron and steel smelting, chemical metallurgy, ceramics, glass, cement and other fields.
Brown Corundum lower grade contains alumina (AL2O3) is about 90%. Is was made by the lower grade of the original block of brown fused alumina. So it has a lower price. Classification of brown corundum block is up to the crystallization precipitation resulted in brown corundum smelting process, in the middle part of the electric arc furnace is the best crystalline and the impurities is at least, this belongs to Grade one brown corundum. The upper lower quality is used to make lower grade Brown Corundum. Corundum lower grade still has a certain degree of hardness and the characteristics of refractories, with its low cost and it can replace part of a brown corundum to use. It mainly used for sandblasting, polishing, grinding and cutting, die casting coating, wear non slip, water filtration, refractory material etc.
Brown fused corundum second grade is made by the brown fused alumina level block of crushing and screening. Its chemical composition is slightly worse, the hardness is slightly lower. But the cost is low, so that it can be used for sandblasting polishing, rust cleaning, grinding cutting, anti slip material, wear-resisting flooring, slippery floors, water treatment and other fields. The alumina (Al2O3) content of the brown fused alumina is about 80%, which belongs to second grade.