Process for production of a highly pure silicic acid aqueous sol

Details Process for production of a highly pure silicic acid aqueous sol Process for production of a highly pure silicic acid aqueous sol

1990-11-30

1992-11-24

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

204101, 2041822, 2041824, 423332, 423335, C01B 33143, B01D 1302

Patent

active

051659050

ABSTRACT:
A process for producing high purity silicic acid aqueous solution is disclosed, wherein alkali metals in an alkali silicate solution are removed by ion-exchanging, the resulting solution is treated in an electrochemical process in the present of a strong acid and oxidizing agent to solubilize the remaining non-alkali metal salts, and the non-alkali metals in the water soluble salts are removed by ion-exchanging to obtain the silicic acid aqueous solution.

REFERENCES:
patent: 3649556 (1972-03-01), Hoffman
patent: 3668088 (1972-06-01), Iler
patent: 4124471 (1978-11-01), Lieb et al.
patent: 4147605 (1979-04-01), Schenker et al.
patent: 4387008 (1983-06-01), Winyall et al.

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