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The main component of bauxite, alumina, alumina hydrate system containing impurities, is a earthy minerals. White or gray, because iron and brownish yellow or reddish. Density 3.9 ~ 4g / cm3, hardness 1-3, opaque, brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution. Mainly used for aluminum smelting, manufacture refractories. Name bauxite ore bauxite, bauxite. Its composition is very complex and is very different hydrous aluminum ore collectively variety of geological sources. If a boehmite, a diaspore and gibbsite (Al2O3 · 3H2O); some boehmite and kaolinite (2SiO2 · Al2O3 · 2H2O) accompanied constitution; some with kaolinite, and with increased kaolinite content, constitute general of bauxite or kaolin clay stone. Bauxite is generally chemical weathering or exogenous role in the formation, there are few pure mineral, mineral always contains some impurities, or less contain clay minerals, iron minerals, titanium minerals and detrital heavy minerals and so on. http://www.zzshb.com/ purposes: (1) aluminum industry. (2) precision casting. Bauxite processed into powder, made of casting molds. (3) for refractory products. High bauxite refractoriness up to 1780 ℃, chemical stability, good physical properties. (4) aluminosilicate refractory fibers. . Refractory bauxite number of technical criteria: grade chemical composition of the bulk density of refractoriness Al2O3 CaO Fe2O3 grade> 85 <0.6 <2.0> 1790> 3.0 a> 80 <0.6 <3.0> 1790> 2.8 A 70 to 80 second <0.8 <3.0> 1790> 2.65 Grade B 60 to 70 <0.8 <3.0> 1770> 2.55 three 50 to 60 <0.8 <2.5> 1770> 2.45