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▐ What is brown fused alumina? What is the main application of brown fused alumina?
Brown corundum, also known as emery, is a tan artificial corundum made by melting and reducing three raw materials of bauxite, carbon material and iron filings in an electric arc furnace. The main chemical composition of brown fused alumina is AL2O3, which is from 95.00% to 97.00%, and contains a small amount of Fe, Si, Ti, etc.
Its main applications are:
(1) Due to its high temperature resistance, corrosion resistance, high strength and other properties, it is used to smelt rare metal, special alloys, ceramics, ironmaking blast furnace linings (walls and tubes) in steel sliding nozzles; physicochemical vessels, spark plugs, Heat resistant oxidation resistant coating.
(2) Due to its high hardness, good wear resistance and high strength, it is used in chemical systems for various reaction vessels and pipes, parts of chemical pumps; mechanical parts, various molds, such as wire drawing molds, Squeeze the pencil core mold mouth, etc.; make tools, mold abrasives, bulletproof materials, human joints, seal mold rings, etc. (3) Corundum insulation materials, such as corundum lightweight bricks, corundum hollow spheres and fiber products, are widely used in furnace walls and furnace roofs of various high-temperature furnaces, which are resistant to high temperatures and heat preservation. The fused brown corundum granular sand is made of artificially selected brown corundum pieces, which are processed by rolls, ball mills, barmac and other equipment. The particle size is from F8-F325. It is mainly used for polishing, grinding, industrial grinding, etc. Customers request processing such as washing and pickling to meet the different needs of customers. The low carbon brown corundum is reprocessed in front of the furnace and special process to reduce the residual carbon content in the brown corundum, so that the product does not chalk, crack, and toughness in the use of the abrasives industry, the preferred raw material for the refractory industry. Mainly used in ceramic abrasives, high-grade abrasives, organic abrasives, abrasive belts, coated abrasives, etc., according to residual carbon content: calcined brown corundum C ≤ 0.05%, low carbon brown corundum C ≤ 0.10%, ordinary brown Corundum C ≤ 0.15%.
Brown corundum is made of high-quality bauxite as raw material, and is made by anthracite and iron filings in the arc under high temperature of 2000 °C. It is crushed and shaped by self-grinding machine, magnetically removed and sieved into various particle sizes. Its texture is dense and hard. High, granules form spherical, suitable for the manufacture of ceramic, resin high-density abrasives as well as grinding, polishing, sandblasting, precision casting, etc., can also be used to manufacture advanced refractory materials. The main component of brown corundum is alumina, and the grade is also distinguished by the aluminum content.
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