Corundum alumina is a kind of high-grade synthetic raw materials. Is the use of high quality bauxite as the main raw material, adding coke, iron and other auxiliary materials, high temperature smelting in an electric arc furnace purification.
Brown corundum is generally tan, Al2O3≥94.5%, SiO2≤2.5%, TiO2≤3.5%, Fe2O3≤1%, and its mineral composition is dominated by α-Al2o3. The center of the crystal is rhombic, thick plate and cracked Particles, surrounded by more silica, calcium oxide melt crystallization, was long plate, the most coarse grains were skeletal lamellae. The tone of corundum depends heavily on the residual titanium oxide.
Corundum is mainly used as abrasive. In recent years, it has been widely used in refractory materials, such as iron hook castables, anhydrous blisters, corundum bricks, prefabricated pieces, breathable bricks, ladle tiles, magnesia-alumina brick.
Brown corundum for refractories commonly used in the aggregate and fine powder, it has the advantages of high refractoriness, wear resistance, erosion resistance, erosion resistance, bulk density, high alumina content, mainly for high aluminum and Alumina. When making products there is a high load softening temperature and high temperature volume stability. However, the corundum impurities determine the life of the product during use. As the smelting impurities have not yet been completely removed, so corundum also contains calcium aluminate, calcium plagioclase, spinel, rutile and other secondary crystal phase, as well as the glass phase, ferroalloy and solid solution. In a large sense, the corundum smelting process and smelting time determines its product performance and quality.
