Refractory Materials Bauxite Mine Brown Fused Alumina (Al2O3) Aluminum Oxide Powder Fines 325 Mesh
Feature: BFA has good crystallization, well toughness, low linear expansion coefficient, corrosion resistance. Details information: Brown Fused Alumina is produced by the smelting of Calcined Bauxite in an electric arc furnace at temperatures greater than 2000C. Application: Wear-resistant and refractory products, Reusable abrasive, Resin bond abrasive tools, Grinding and polishing media, Ceramic grinding wheels, sandblasting, precision casting.
Feature
BFA has good crystallization, well toughness, low linear expansion coefficient, corrosion resistance.
Details information
Brown Fused Alumina is produced by the smelting of Calcined Bauxite in an electric arc furnace at temperatures greater than 2000C.
Application
Wear-resistant and refractory products, Reusable abrasive, Resin bond abrasive tools, Grinding and polishing media, Ceramic grinding wheels, Sandblasting, Precision casting.
Brown Fused Alumina also called Brown Fused Aluminum Oxide, Brown Aluminum Oxide or Brown Corundum. It is a material produced by fusion process of bauxite (source of aluminum oxide) and other fillings and crushed and screened into grits of different sieving distribution. It is a brown, dense, tough, hard, heat resistant, abrasion resistant material widely used for abrasives, refractory and sandblasting purposes. Main manufacturing processes as below.
Main production process
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Fusion/Smelting
Calcined Bauxite, Anthracite and Iron Fillings are the main raw materials for producing of Brown Fused Alumina. NY TWO choose the best quality calcined bauxite which contains about 88% aluminum oxide, which is the main source of Al2O3 in BFA. These raw materials are mixed together at certain proportion and fused/smelted in electric arc furnace in about 2200℃. Common furnaces are Fixed Furnace or Tilting Furnace (Dumping Furnace). During fusion process, iron contents settle at the bottom of the furnace, carbon contents go to surface of furnace, and aluminum oxide contents in the middle. The raw materials are crystallized and impurities are reduced. This is the most important process for Brown Fused Alumina which decided purity and hardness of it.
BFA Lumps & Crushing
he fused BFA are cooled down and crushed into big lumps which look brown. This is material of high aluminum oxide content. BFA lumps are then crushed into smaller sizes for further production.
Screening/Sieving
Brown Fused Alumina lumps grits are then put into crushers for further crushing into smaller sizes and screened into grits of different sieving distribution. This is coarse finer grades of good sieving distribution suitable for abrasives and refractory purposes. There is different quality standard such as GB, FEPA, JIS, ANSI standards. After screening, content of Aluminum Oxide (Al2O3) is about 95%, with little content of Iron Oxide (Fe2O3), Titanium Oxide (TiO2) and Silicon Oxide (SiO2) and little magnetic contents. Magnetic contents are then removed relevant equipment, which process is important as for refractory and abrasives applications magnetic contents will harm the finished products. For Al2O3, the finer(smaller) the grit is, the lower the content is.
Packing
After production, Brown Fused Alumina are packed and shipped to customers. Most common packing are Big Bags of 1 metric ton, 1.2 or 1.3 metric tons. Or packed into 25kg woven plastic bags or 25kg paper bags, and 40 bags on a pallet.
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