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Chemical composition and main functions of brown corundum


The chemical composition of brown corundum: Al2O3 95% -97.5% SiO2 <1% TiO2 1.5-3.9% Fe2O3 <0.25% CaO <0.25%, crystal form: α-Al2O3 trigonal crystal form.
Artificial corundum mainly includes brown corundum, white corundum and special corundum.
Brown corundum is brown, with a micro hardness of 1800-2200KG / 2200mm2. There are brown corundum blocks, brown corundum section sand, brown corundum fine powder, and brown corundum grain sand on the market.
The main functions of brown corundum (1) Because of its high temperature resistance, corrosion resistance, high strength and other properties, it is used to cast steel sliding nozzles to treat rare metal, special alloys, ceramics, and iron linings (walls and pipes); Physical and chemical utensils, spark plugs, heat-resistant and oxidation-resistant coatings.
(2) Corundum insulation materials, such as corundum light bricks, corundum hollow balls and fiber products, are widely used in furnace walls and roofs of various high-temperature furnaces, which are resistant to high temperatures and heat. Brown corundum grain sand is processed by manual selection of brown corundum blocks, using pair of rollers, ball mills, Barmac and other equipment. The grain size is F8-F325. It is mainly used for polishing, grinding, industrial grinding, etc. Processing by water washing, pickling and other methods can meet the different needs of customers.
(3) Due to the characteristics of high hardness, good abrasion resistance and high strength, it is used as a component of various reaction vessels and pipes and chemical pumps in chemical systems; it is used for mechanical parts and various molds, such as wire drawing molds, Squeeze the tip of a pencil core, etc .; make knives, mold abrasives, bulletproof materials, human joints, sealing mold rings, etc.
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