Process for producing sodium fluoride from sodium silicofluoride

Details Process for producing sodium fluoride from sodium silicofluoride Process for producing sodium fluoride from sodium silicofluoride

1976-11-03

1977-11-08

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Binary fluorine containing compound

423339, 423341, 423470, C01D 302, C01B 3312, C01C 116, C01B 3300

Patent

active

040576140

ABSTRACT:
A process for producing sodium fluoride from sodium silicofluoride in which sodium silicofluoride is added to an ammonium fluoride solution for double decomposition reaction to obtain a slurry containing sodium fluoride as crystals and ammonium silicofluoride in dissolved form, and the solution from which the sodium fluoride crystals have been removed is added with ammonia to decompose the ammonium silicofluoride into silica and ammonium fluoride. The ammonium fluoride obtained by the decomposition is recycled to the double decomposition step. Alternatively, the ammonium fluoride is reacted with a sodium salt for recovery as sodium fluoride.

REFERENCES:
patent: 3024086 (1962-03-01), Cines
patent: 3755546 (1973-08-01), Lichstein et al.
patent: 3907973 (1975-09-01), Kidde
patent: 3968197 (1976-07-01), Satoh et al.

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