Process for producing fluorine compounds and amorphous silica

Details Process for producing fluorine compounds and amorphous silica Process for producing fluorine compounds and amorphous silica

1980-03-28

1981-12-29

Hearn, Brian E.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423462, 423465, 423490, C01B 3312, C01B 722

Patent

active

043082440

ABSTRACT:
Hydrofluoric acid and/or other fluorine compounds are recovered by reacting fluosilicic acid with a sodium-containing compound to form an alkaline aqueous slurry comprising precipitated amorphous silica and dissolved sodium fluoride. The precipitated amorphous silica is separated from the alkaline aqueous slurry leaving an aqueous solution of sodium fluoride. The sodium fluoride solution can be used as such or reacted with other substances (such as alumina, to form synthetic cryolite). Sodium fluoride is recovered from the aqueous solution (as by evaporation or extraction) and used per se or reacted with sulfuric acid to produce hydrogen fluoride.

REFERENCES:
patent: 3000702 (1961-09-01), Cunningham
patent: 3549317 (1970-12-01), Dorn
patent: 3968197 (1976-07-01), Satoh
patent: 4026997 (1977-05-01), Schneider
patent: 4213951 (1980-07-01), Sikdar et al.
patent: 4213952 (1980-07-01), Sikdar
Thomsen, "Acidimetric Titrations in the Fluosilicic Acid System", Anal. Chem., vol. 23 (1951), pp. 973-975.

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