Molecular formula of anhydrous aluminum fluoride: AlF3; relative molecular mass: 83.98.
Anhydrous aluminum fluoride is used in the aluminum electrolysis industry to reduce the melting temperature of electrolyte and improve the electrical conductivity, as the melting agent of non-ferrous metal, the flux of ceramic glaze and enamel glaze and the component of glaze drug, as well as the inhibitor of parafermentation in the production of essential oil.
Anhydrous aluminum fluoride is used as an inhibitor of by-product fermentation in alcohol production.
Anhydrous aluminum fluoride is used as a welding fluid in metal welding and in the manufacture of optical lenses. It is also used as a catalyst of organic synthesis and raw material of artificial cryolite, etc.
Aluminum fluoride is a colorless trinomial crystal. It looks like white powder or very large rhombohedral hexahedral crystals. The density is 3.00g/cm. The melting point is 1040℃. The boiling point (sublimation) is 1272℃. It is slightly soluble in cold water and soluble in hot water. Anhydrous aluminum fluoride is insoluble in acid and alkali solutions, most organic solvents, hydrofluoric acid and liquefied hydrogen fluoride. It does not react with liquid ammonia or concentrated sulfuric acid, or with potassium hydroxide.
Anhydrous aluminum fluoride is not reduced by hydrogen, does not decompose under strong heat but sublimates, and is very stable in nature. It can be partially decomposed into hydrogen fluoride and aluminum oxide by water vapor when heated to 300-400℃. There are three kinds of hydrates, namely, monohydrate, trihydrate and nonahydrate.
At present, aluminum fluoride products can be divided into three categories: anhydrous aluminum fluoride, dry aluminum fluoride and wet aluminum fluoride.
1. Anhydrous aluminum fluoride process: anhydrous hydrogen fluoride (content of 99.9% or more) as raw material, and aluminum hydroxide for gas-solid reaction to produce aluminum fluoride products.
2. Dry aluminum fluoride process is mainly the fluorite production of unpurified hydrogen fluoride gas as raw materials, and aluminum hydroxide gas-solid reaction production of aluminum fluoride products.
3. Wet aluminum fluoride process is mainly with fluorspar production of aqueous hydrofluoric acid as raw material, and aluminum hydroxide for liquid-solid reaction production of aluminum fluoride products.
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