Recovery of aluminum fluoride

Details Recovery of aluminum fluoride Recovery of aluminum fluoride

1974-07-30

1976-03-02

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Binary fluorine containing compound

423462, C01F 750

Patent

active

039418740

ABSTRACT:
An aqueous solution containing fluorides, for example, hydrofluoric acid, is reacted with commercial grade aluminum oxide comprising predominantly alpha alumina at an elevated temperature to produce a complex aluminum hydroxide fluoride hydrate that precipitates from the solution. The commercial grade aluminum oxide contains an amount of gamma and delta alumina such that the aluminum oxide has a loss of weight on ignition of from about 0.5% to about 2.5%. The resulting aluminum hydroxide fluoride hydrate precipitate is recovered and calcined in a non-oxidizing atmosphere to produce aluminum fluoride suitable for use in the electrolytic production of aluminum.

REFERENCES:
patent: 3492086 (1970-01-01), Ve et al.
patent: 3823078 (1974-01-01), Beeler
patent: 3823079 (1974-07-01), Beeler
patent: 3843498 (1974-10-01), Payne
chemical Abstracts, Vol. 55, 1961, p. 11776.

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