Process for working-up an aqueous silicohydrofluoric acid soluti

Details Process for working-up an aqueous silicohydrofluoric acid soluti Process for working-up an aqueous silicohydrofluoric acid soluti

1987-07-22

1988-09-27

Sever, Frank

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210737, 210768, 210774, B01D 2101

Patent

active

047740051

ABSTRACT:
An aqueous solution of hexafluorosilicic acid containing 2 to 15 wgt % H.sub.2 SiF.sub.6 is worked up. To this end, the solution is admixed with particulate CaCO.sub.3 or Ca(OH).sub.2 consisting to an extent of at least 70% of particles having a size of more than 8 .mu.m, but to an extent of at most 15% of particles having a size of more than 2 mm, or with CaCO.sub.3 in admixture with CaO or Ca(OH).sub.2. The calcium compound is used in a quantity sufficient to establish a molar ratio of Ca.sup.2+ /SiF.sub.6.sup.2- of 2.8 to 3.5, and the reaction is effected at a temperature higher than 50.degree. C. After a period of 0.6 to 2.5 hours, the reaction product is filtered.

REFERENCES:
patent: 3907978 (1975-09-01), Spreckelmeyer
patent: 3971845 (1976-07-01), Becker et al.
patent: 4031193 (1977-06-01), Becker et al.
patent: 4078043 (1978-03-01), Becker et al.

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