Corundum quality bauxite as raw material, coal, iron, in the electric arc melting temperature by more than 2000 degrees made by the plastic from the mill grinding, magnetic separation to iron and screening into a variety of size, its dense texture, high hardness, formation of spherical particles, for the manufacture of ceramics, resin, abrasive and high grinding, polishing, sand blasting, precision casting, etc., can be used to manufacture high-grade refractory material. . Corundum corundum main components of the level of alumina, aluminum content also graded to distinguish, ok Okay lower aluminum content will lower the hardness.