Process for the production of ammonium fluoride from fluosilicic

Details Process for the production of ammonium fluoride from fluosilicic Process for the production of ammonium fluoride from fluosilicic

1976-04-13

1977-05-31

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Ammonium halide

423339, C01C 116, C01B 3312

Patent

active

040269973

ABSTRACT:
In the production of an ammonium fluoride solution by precipitating hexafluosilicic acid from its solution with ammonia and from the resulting suspension separating off the silicon dioxide precipitated, the improvement which comprises thoroughly mixing the hexafluosilicic acid solution and ammonia at a temperature of about 40.degree. to 90.degree. C, in such proportions that the suspension obtained contains at least 1% of free ammonia and at most 22% of ammonium fluoride, the average residence time of the reactants in the precipitation zone being at least 4 minutes. Advantageously, the silicon dioxide is separated off from the suspension obtained without previous cooling, the resulting ammonium fluoride filtrate is left standing for at least 30 minutes to permit flocculation of silicon dioxide contained therein and the flocculated silicon dioxide is separated off.

REFERENCES:
patent: 2780522 (1957-02-01), Gloss et al.
patent: 2816818 (1957-12-01), Gross
patent: 3271107 (1966-09-01), Nickerson et al.
patent: 3563699 (1971-02-01), Cuneo

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