Method of concentrating silica in an aqueous alkali metal silica

Details Method of concentrating silica in an aqueous alkali metal silica Method of concentrating silica in an aqueous alkali metal silica

1984-09-21

1985-12-03

Metz, Andrew H.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 94, 204301, 2041825, 423332, 423335, 423339, C25B 700, C25B 116

Patent

active

045564663

ABSTRACT:
The ratio of silica to alkali in silicate liquors is increased, for example to convert alkaline grades to neutral grades, by passing the liquor through an electrodialysis stack comprising spaced ion-exchange membranes mounted between an anode and a cathode, the membranes forming cell triplets of a concentrating cell between an ion-exchange membrane and a fine cation exchange membrane, a diluting cell between the first cation exchange membrane and a second cation exchange membrane and a proton donor cell between the second cation exchange membrane and an adjacent anion-exchange membrane, the method comprising passing the silicate liquors through the diluting cells in the stack, passing water or an aqueous solution through the concentrating cells and passing an acidic solution through the proton donor cells whereby the silicate liquor is caused to lose alkali metal ions to the concentrating liquor and to receive hydrogen ions from the proton donor liquor.

REFERENCES:
patent: 3654105 (1972-04-01), Chilton
patent: 3668088 (1972-06-01), Iler
patent: 4124471 (1978-11-01), Lieb et al.
patent: 4147605 (1979-04-01), Schenker et al.
patent: 4203822 (1980-05-01), Schenker et al.
patent: 4303487 (1981-12-01), Carlin et al.
patent: 4387008 (1983-06-01), Winyall et al.
patent: 4410405 (1983-10-01), Bergna
patent: 4508607 (1985-04-01), Winyall et al.

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