Process for preparing calcium fluoride from hexafluoro silicic a

Details Process for preparing calcium fluoride from hexafluoro silicic a Process for preparing calcium fluoride from hexafluoro silicic a

1976-12-15

1978-03-07

Stern, Edward

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423338, 423490, C01F 1122, C01B 3314, C01B 3316, C01B 722

Patent

active

040780430

ABSTRACT:
Disclosed is a process for the preparation of calcium fluoride comprising reacting hexafluoro silicic acid with calcium carbonate in the presence of sulfate or aluminum ions within a pH range of between about 2 and 6 and separating the calcium fluoride precipitate from the resulting aqueous silica sol.

REFERENCES:
patent: 2780523 (1957-02-01), Gloss
patent: 2914474 (1959-11-01), Hillyer et al.
patent: 3551332 (1970-12-01), Baumann et al.
patent: 3907978 (1975-09-01), Spreckelmeyer
patent: 4031193 (1977-06-01), Becher et al.

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