1, white corundum: industrial alumina powder is used as raw material, which is melted at high temperature above 2000 degrees in electric arc and then cooled. After crushing and shaping, magnetic separation to remove iron and screening, the texture is dense, the hardness is high, and the particles form sharp corners. Suitable for manufacturing ceramics, resin bonded abrasives, grinding, polishing, sand blasting, precision casting (corundum for precision casting) and so on. , can also be used to manufacture advanced products.
2. Brown corundum: bauxite and coke (anthracite) are used as the main raw materials and are smelted by electric arc furnace at high temperature. The abrasive tool made of it is suitable for grinding metals with high tensile strength, such as all kinds of ordinary steel, malleable cast iron, hard bronze, etc., and can also be used to manufacture advanced refractories. It has the characteristics of high purity, good crystallization, strong fluidity, low linear expansion coefficient and corrosion resistance.
3. Silicon carbide: It is made by melting quartz sand, petroleum coke (or coal coke) and sawdust in a resistance furnace at high temperature. Among the non-oxide high-tech refractories such as carbon, nitrogen and boron, silicon carbide is the most widely used and economical one. Can be called diamond sand or refractory sand, hope to adopt.