Method of concentrating silka in an aqueous alkali metal silicat

Details Method of concentrating silka in an aqueous alkali metal silicat Method of concentrating silka in an aqueous alkali metal silicat

1984-09-21

1985-12-10

Metz, Andrew H.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 98, 204301, 423332, 423335, 423339, C25B 700, C25B 116

Patent

active

045578150

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

REFERENCES:
patent: 3654105 (1972-04-01), Chilton
patent: 3668088 (1972-06-01), Iler et al.
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

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