Process of preparing high purity cryolite from fluoride solution

Details Process of preparing high purity cryolite from fluoride solution Process of preparing high purity cryolite from fluoride solution

1979-08-07

1981-02-17

Hearn, Brian E.

Chemistry of inorganic compounds

Halogen or compound thereof

Plural metal or metal and ammonium containing

C01F 750

Patent

active

042515017

ABSTRACT:
A process of precipitating cryolite from a reaction solution given by mixing a sodium aluminate solution with a fluoride solution containing silica dissolved therein as impurity at reaction temperatures above 60.degree. C. To reduce silica content in the precipitated cryolite, the reaction solution is made to contain carbonate ions, 1-20 g/l as CO.sub.2, by introducing either carbon dioxide gas or a soluble carbonate into the fluoride solution Moreover, ignition loss of the cryolite can be decreased by preheating the sodium aluminate solution to 90.degree. C. or above.

REFERENCES:
patent: 1871723 (1932-08-01), Morrow
patent: 2994582 (1961-08-01), Byrns
patent: 3563699 (1971-02-01), Cuneo
patent: 3816591 (1974-06-01), Schmidt
patent: 4165264 (1979-08-01), Satchell

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