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Alumina Variant

wallpapers Industry 2021-01-22
Aluminum is a silver-white light metal. There is malleability. Commodities are often made into rods, sheets, foils, powders, ribbons and filaments. It can form an oxide film to prevent metal corrosion in humid air. Aluminum powder and aluminum foil can burn violently when heated in the air and emit a dazzling white flame.
 
Aluminum compounds
 
The content of aluminum in the earth's crust is relatively high, mainly in aluminosilicate ore, bauxite and cryolite. Alumina is a white amorphous powder with many variants, among which the most familiar are α-alumina and β-alumina. The corundum that exists in nature belongs to α-alumina. Its hardness is second only to that of diamond. It has a high melting point and is resistant to acids and alkalis. It is often used to make bearings, abrasives, and refractory materials. Such as corundum crucible, can withstand high temperature of 1800℃. Alumina has many colors due to the different impurities. For example, those containing a small amount of Cr(III) are red, called rubies; those containing Fe(II), Fe(III) or Ti(IV) are called sapphires.
 
β-alumina is a porous substance with an internal surface area of ​​up to hundreds of square meters per gram. It has high activity. It is also known as activated alumina. It can absorb water vapor and many other gas and liquid molecules. It is often used as an adsorbent. Catalyst carrier and desiccant are also used as raw materials for industrial smelting of aluminum.
 
Aluminum hydroxide can be used to prepare aluminum salts, adsorbents, mordants and ion exchangers. It can also be used as raw materials for enamel, refractory materials, and fireproof cloth. Its gel liquid and thousand gel are used as acid agents in medicine. It neutralizes gastric acid and treats ulcers, and is used to treat gastric and duodenal ulcers and hyperacidity.
 
Sodium metaaluminate is often used in printing and dyeing fabrics, producing lake blue dyes, making wool glass rot, soap, and hardened building stones. In addition, it is also a good water softener, papermaking filler, water purifier, and rayon delusterant.

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Tag: powder   Aluminum