Aluminum fluoride
Colorless or white crystals. Insoluble in water, insoluble in acid and alkali. It is very stable in nature and can be hydrolyzed under heating. Mainly used for aluminum. Aluminum trichloride and hydrofluoric acid, ammonia water system.
Chemical properties
There was no reaction with liquid ammonia or concentrated sulfuric acid, or with hydrated potassium hydroxide. Not reduced by hydrogen, strong heat does not decompose but sublimates, and its properties are very stable. Heating to 300-400¡ãC can be partially decomposed by steam into hydrogen fluoride and aluminum oxide.
Aluminium Fluoride AlF3
Aluminium fluoride is an important additive for the production of aluminium by electrolysis. Together with cryolite, it lowers the melting point to below 1000 ¡ãC and increases the conductivity of the solution. It is into this molten salt that aluminium oxide is dissolved and then electrolyzed to give bulk Al metal.
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Chemical Constituent (mass fraction) %
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F
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Al
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Na
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SiO2
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Fe2O3
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SO4
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P2O5
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Loss of Ignition
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¡Ý
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¡Ü
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¡Ý
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AIF-0
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61.00
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31.50
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0.30
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0.10
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0.06
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0.10
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0.30
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0.50
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1.50
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AIF-1
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60.00
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31.00
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0.40
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0.30
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0.10
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0.60
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0.04
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1.00
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1.30
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AIF-2
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58.00
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29.00
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2.80
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0.30
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0.12
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1.00
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0.04
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5.50
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0.70
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AIF-3
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58.00
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29.00
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2.80
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0.35
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0.12
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1.00
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0.04
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5.50
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0.70
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