Bauxite

The scientific name of bauxite is bauxite, bauxite ore. Its composition is extremely complex, and it is a general term for a variety of hydrous alumina ores from very different geological sources. Such as boehmite, diaspore and gibbsite (Al2O3 3H2O); some are composed of diaspore and kaolinite (2SiO2 Al2O3 2H2O); some are mainly kaolinite, and with The increase of kaolinite content constitutes general bauxite or kaolinite clay. Bauxite is generally formed by chemical weathering or exogenous action. There are few pure minerals and always contain some impurity minerals, more or less clay minerals, iron minerals, titanium minerals and detrital heavy minerals.

Bauxite white or off-white, brownish-yellow or light red due to iron content. Density 3.45g/cm3, hardness 1-3, opaque and brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid and sodium hydroxide solution. It is mainly used for aluminum smelting and refractory

Uses of bauxite:

(1) Aluminum smelting industry. Used in national defense, aviation, automobiles, electrical appliances, chemicals, daily necessities, etc.

⑵ precision casting. The bauxite clinker is processed into fine powder and made into molds for precision casting. Used in military industry, aerospace, communication, instrumentation, machinery and medical equipment departments.

⑶ for refractory products. The refractoriness of high alumina bauxite clinker is as high as 1780°C, with strong chemical stability and good physical properties.

⑷Aluminosilicate refractory fiber. It has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small heat capacity and mechanical shock resistance. Used in iron and steel, nonferrous metallurgy, electronics, petroleum, chemical industry, aerospace, atomic energy, national defense and other industries. It puts high-alumina clinker into a high-temperature electric arc furnace with a melting temperature of about 2000-2200°C, and after high-temperature melting, high-pressure high-speed air or steam injection, and cooling, it becomes white "cotton" - aluminum silicate Refractory fiber. It can be pressed into fiber blankets, boards or woven into cloth to replace refractory bricks lining high-temperature kilns in smelting, chemical, glass and other industries. Firefighters can make clothes from refractory fiber cloth.

⑸Using magnesia and bauxite clinker as raw materials, adding a proper binder, it is very effective for pouring the overall lining of the steel drum.

⑹ Manufacture of bauxite cement, abrasive materials, ceramic industry and chemical industry can produce various compounds of aluminum.