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Alumina (aluminous soil; bauxite),  the main component is alumina,
hydrated alumina system containing impurities, is a earthy mineral. White or gray, brown due to iron and was yellow or light red. Density of 3.9 ~ 4g/cm3, hardness **3, opaque, brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution. Mainly used in aluminum smelting, manufacturing refractories.
 
(1) The aluminum smelting industry. For defense, aerospace, automotive, electrical, chemical, and other daily necessities.
(2) Casting. Bauxite clinker processed into a fine powder made ​​of mold after casting. For military, aerospace, communications, instrumentation, machinery and medical equipment sectors.
(3) for refractory products. High-alumina clinker refractoriness up ***0 ℃, chemical stability, good physical properties.
(4) aluminosilicate refractory fibers. Light weight, high temperature, thermal stability, low thermal conductivity,
 small heat capacity and resistance to mechanical vibration and so on. For iron and steel, nonferrous metallurgy,
electronics, petroleum, chemical, aerospace, atomic energy, defense and other industries. It is the high-alumina clinker into
the melting temperature is about ***0 ~ ***0 ℃ high temperature electric arc furnace, melting at high temperature,
high pressure air or steam injection, cooling, it becomes a white "cotton" - aluminum silicate fire-resistant fiber.
It can be pressed into the fiber blanket, board, or woven into cloth instead of smelting, chemical, glass and other industrial
 high temperature furnaces lined with refractory bricks. Firefighters used fire-resistant fabric made ​​of clothes.
(5) magnesia clinker and bauxite as raw material, adding an appropriate combination of agents for the casting ladle lining
 the overall effect is very good barrel.
(6) manufacturing alumina cement, abrasive materials, ceramic industry and chemical industry can be a variety of aluminum
compounds.