Recovery of hydrofluoric acid from fluosilicic acid with high pH

Details Recovery of hydrofluoric acid from fluosilicic acid with high pH Recovery of hydrofluoric acid from fluosilicic acid with high pH

1978-10-23

1980-07-22

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423341, 423483, 423484, 423490, C01B 3312, C01B 722, C01D 302

Patent

active

042139520

ABSTRACT:
Hydrofluoric acid is recovered from fluosilicic acid by reacting fluosilicic acid with sodium sulfate to form sodium fluosilicate. The sodium fluosilicate is reacted with sodium hydroxide to form a first slurry having a pH of from about 11 to about 14, the first slurry containing sodium metasilicate and precipitated sodium fluoride. Sodium fluoride is recovered from the first slurry leaving a first solution which is reacted with sodium fluosilicate or fluosilicic acid or both to form a second slurry comprising silica and dissolved sodium fluoride. The reaction occurs under such conditions that the second slurry contains precipitated amorphous silica. The precipitated amorphous silica is separated from the second slurry leaving a second solution of sodium fluoride. Sodium fluoride is recovered from the second solution. Recovered sodium fluoride is reacted with sulfuric acid to produce hydrogen fluoride.

REFERENCES:
patent: 3061541 (1962-10-01), Henry
patent: 3278265 (1966-10-01), Quarles
patent: 3506394 (1970-04-01), Okamura et al.
patent: 3537817 (1970-11-01), Bachelard
patent: 3549317 (1970-12-01), Dorn et al.
patent: 3689216 (1972-09-01), Brown
patent: 3755532 (1973-08-01), Harrison et al.
patent: 3878294 (1975-04-01), Schabacher et al.
patent: 3914398 (1975-10-01), Faust

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