Process for preparing anhydrous aluminum fluoride

Details Process for preparing anhydrous aluminum fluoride Process for preparing anhydrous aluminum fluoride

1976-06-16

1978-01-24

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Binary fluorine containing compound

423356, 423472, C01F 750, C01C 102, C01C 116

Patent

active

040704475

ABSTRACT:
Ammonium tetrafluoroaluminate particles having an average particle size above 50.mu. are reacted with an aluminum compound such as aluminum hydroxide or oxide first at a temperature of 250.degree. C to 300.degree. C and then at a temperature of 350.degree. to 500.degree. C to form crystalline particles of anhydrous aluminum fluoride (II) with an average particle size almost corresponding to the starting ammonium tetrafluoroaluminate. The heating of the crystalline particles to a temperature above 550.degree. C results in formation of aluminum fluoride (I) with a large average particle size.

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