Brown corundum common name also known as emery. It is made of alumina, carbon material, iron scrap three raw materials in the electric furnace after melting reduction and brown artificial corundum, so the name. The main chemical composition of brown corundum is Al2O3, its content is between 94.5% ~ 97%, and contains a small amount of Fe, Si, Ti and so on. Its main applications are:
- Because of high temperature resistance, corrosion resistance, high strength and other properties, it is used to pour steel sliding nozzle, smelting rare metals, special alloys, ceramics, iron blast furnace lining (wall and pipe); Physical and chemical utensils, spark plugs, heat resistant and oxidation resistant coating.
- Due to the characteristics of high hardness, good wear resistance, high strength, in the chemical system, used as a variety of reaction vessels and pipes, chemical pump components; Do mechanical parts, various molds, such as wire drawing die, extrusion pencil core die mouth, etc.; Do tools, mold abrasives, bulletproof materials, human joints, sealing mold ring, etc.
- Corundum insulation materials, such as corundum lightweight brick, corundum hollow ball and fiber products, are widely used in various high temperature furnace wall and furnace top, both high temperature resistance and heat insulation. Brown corundum particle size sand is made of hand-selected brown corundum block, processed by rolling, ball milling, Barmak and other equipment. The particle size is from F8 to F325, mainly used for polishing, grinding, industrial grinding, etc. It can also be washed, pickling and other processing methods according to customer requirements, to meet the different needs of customers.
Low carbon brown corundum after furnace and special process of reprocessing, reduce the content of residual carbon in brown corundum, so that the product in use is not pulverized, not burst, toughness, is the first choice of abrasive tools industry, refractory industry. Mainly used for ceramic abraded tools, abraded tools, organic abraded tools, abrasive belt, coated abraded tools, etc. According to the residual carbon content, it can be divided into: calcined brown corundum C≤0.05%, low carbon brown corundum C≤0.10%, ordinary brown corundum C≤0.15%.
Brown corundum with good bauxite as raw material, and anthracite, iron filings in the arc by 2000℃ above high temperature smelting, grinding and shaping, magnetic separation iron, screen into a variety of granularity, its dense texture, high hardness, particle formation ball, suitable for manufacturing ceramics, resin high with abrasive tools and grinding, polishing, sandblasting, precision casting, etc., can also be used to manufacture refractory materials. The main component of brown corundum is alumina, which is classified by aluminum content.