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Alumina powder, chemical symbol Al2O3, molecular weight 102, pure alumina is a white amorphous powder, commonly known as bauxite, the density of 3.9-4.0g/cm3, the melting point of 2050 DEG C, the boiling point of 2980 DEG C, insoluble in water, is an amphoteric oxide, soluble inorganic acid and alkaline solution, there are four kinds of isomers with beta alumina. - V - A - alumina alumina alumina, mainly alpha and gamma type two variants, the industry can be extracted from bauxite.
In the lattice of the alpha type alumina, the oxygen ion is close packed, and the Al3+ is symmetrically distributed in the eight surface coordination center of the oxygen ion, and the crystal lattice can be large, so the melting point and the boiling point are very high. Alpha alumina insoluble in water and acid, also known as alumina industry, is the basic raw material of aluminum; also used for all kinds of refractory bricks, refractory crucible, refractory, high temperature resistant experiment instrument; can also be used as a polishing agent, flame retardant agent and filler; a type of high purity alumina or artificial production artificial corundum, ruby and sapphire materials; also for plate production base of modern large scale integrated circuit.
Alumina is aluminum hydroxide in low temperature 140-150 degrees Celsius under dehydration, the industry also called activated alumina, aluminum hydroxide. The oxygen ion in the structure is close to that of the cubic surface, and the Al3+ is irregularly distributed in the eight surface and the tetrahedral space formed by the oxygen ion. Alumina is insoluble in water, soluble in strong acid or alkali solution, it is heated to 1200 DEG C is converted to alpha alumina. Gamma alumina is a porous material, each gram of the inner surface area of up to hundreds of square meters, high adsorption capacity. Industrial products are often colorless or microstrip pink cylindrical particles, good pressure resistance. In oil refining and petrochemical industry is a commonly used adsorbent, catalyst and catalyst carrier; in industry is the acid removal agent of transformer oil, turbine oil, also used for chromatographic analysis in the laboratory is neutral; strong desiccant, the drying capacity is not less than the use of phosphorus pentoxide, after repeated use in 175 DEG 6-8h also heating regeneration.
At present the world with Bayer process alumina production to account for more than 90% of the total output, most of the alumina used to make metal aluminum, used for other purposes less than 10%
Product specifications: 325 mesh, 400 mesh, 600 mesh, 800 mesh, 1250 mesh, 1500 mesh, 2500 mesh, 2000 mesh, 3000 mesh, etc.
