Alumina (Al ₂ O ₃) is a kind of compound high hardness, melting point is 2054 ℃, boiling point is 2980 ℃, is at high temperatures is ionization ion crystal, often used in the manufacture of refractory products. Industrial Al2O3 is by bauxite (Al2O3 forced the 3 h2o) and preparation of diaspore, for the high purity requirements of Al2O3, usually prepared by chemical methods.
Al2O3, there are many similar crystal, at present there are more than 10 kinds of known, there are mainly three kinds of crystal type, namely the gamma Al2O3, beta Al2O3, alpha Al2O3 (corundum). Which structure is different, with different properties in high temperature above 1300 ℃ is almost entirely into alpha Al2O3.
With China's electrolytic aluminum, ceramic, medicine, electronics, machinery and other industries, with the rapid development of market demand for alumina still have larger growth space, alumina production will be growing. Combined with China's alumina production data from 2005 to 2010, is expected to reach 33 million tons in 2011 China's alumina production, the growth rate of 14%, in 2012 will continue to grow on the basis of in 2011, production will be more than 38 million tons.
In addition, given China's building construction area according to the years continue to surge, and due to the continuous urbanization, aluminum very optimistic prospect in the future. Is expected in 2011 China demand rose 15% to 38.19 million tonnes of alumina, alumina demand will reach 42 million tons in 2012, up 10% from a year earlier.
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