Summary

Bauxite also known as alumina and bauxite, main component is aluminum oxide, hydrated alumina containing impurities, is a kind of earthy mineral. White or gray white, yellow or pale red as a result of iron. Density 3.9 ~ 4g/cm3, hardness 1 ~ 3, opaque, brittle, very difficult to melt. Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution, mainly used in aluminum smelting, refractory materials.
Referred to in the refractory industry bauxite is usually refers to the calcined Al2O3>=48%, and contain low Fe2O3 of bauxite, alumina clinker is after Calcined Bauxite Mine. Clinker is pale yellow and dark grey, it is mainly used for high alumina refractory materials, can also be used to make fused corundum.
Classification of bauxite
Calcined Bauxite by different calcining kiln is divided into:
The shaft of bauxite;
The converter bauxite;
Round kiln bauxite.
Calcined Bauxite according to different uses are divided into:
The refractory grade bauxite;
The grinding grade alumina;
The welding grade bauxite.

Use of bauxite
1, refining - aluminum industrial alumina used in national defense, aviation, automobile, electrical appliances, chemical industry, daily necessities, etc..
2, precision casting, bauxite is processed into fine powder and made into mold casting, used in military, aerospace, communications, instrumentation, machinery and medical equipment department.
3, used for refractory products -- high alumina bauxite refractory high degree of up to 1780 DEG C, strong chemical stability, good physical properties.
4, aluminum silicate refractory fiber - bauxite has light weight, high temperature resistance, good thermal stability, low thermal conductivity, heat capacity of small and resistance to mechanical vibration and other advantages. Bauxite for iron and steel, nonferrous metallurgy, electronics, petroleum, chemical, aerospace, atomic energy, defense and other industries. It is to high Al clinker put into the melt temperature is about 20 to 22 DEG C high temperature electric arc furnace, the melting in high temperature, high pressure high speed air or steam spray blowing and cooling, the white cotton, aluminium silicate refractory fibers. Bauxite can be pressed into refractory fiber blanket, plate or woven cloth instead of smelting, chemical, glass and other industrial furnace lining. Firefighters can make clothes with refractory fiber cloth.
5, alumina magnesia and bauxite as raw material, add appropriate binder, bauxite for pouring ladle lining the whole barrel effect is very good.
6, to produce alumina cement, abrasive materials, ceramic industry and chemical industry can be a variety of aluminum compounds.