Cryolite (sodium fluoroaluminate) is a colorless monoclinic crystal with an appearance similar to that of a cube. The pure product is colorless, and often grayish white, light yellow, light red, black due to impurities. It is usually inseparably dense block, with luster, translucency, white streaks, and glass finsh. The relative density is 2.9 to 3.0 and the melting point is 1000 ° C. It is easy to absorb water and damp. It is soluble in water and the aqueous solution is acidic. If sulfuric acid is used, it releases highly toxic hydrogen fluoride gas.
The sodium fluoroaluminate is mainly used as a flux for aluminum electrolysis, a wear-resistant filler for rubber and grinding wheels, an enamel whitening agent, a glass sunscreen and a metal flux, and an insecticide for crops. The Hall-Heroult method refers to a cryolite-based fluoride melt is used as a solvent to produce metal aluminum. To date, no other compound has been found to replace cryolite. This is because cryolite has other indispensable properties besides being able to dissolve alumina. For example, it does not contain elements that are more positive than aluminum. It has good stability, does not decompose under normal conditions, does not decompose or deliquesce, and has a high melting point. In aluminum, it has good conductivity and saves electricity.
CAS No.: 13775-53-6
Properties: White free flowing powder, slightly soluble in water.
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Application: Sodium Fluoroaluminate is mainly used as a flux for molten salt electrolytic aluminum smelting, also an opalizer in the manufacture of enamel, an opacifier and auxiliary solvent of glass and enamel, an insecticide of crops, a flux in aluminium alloy casting, and in the production of ferrous alloy and effervescing steel.
Storage: Store at ventilating and dry place, prevent wet and keep away from inorganic acid and food.
Packing: 25Kg net, double plastic bags lined plastic woven bag.