Process for the preparation of stable silica sol

Details Process for the preparation of stable silica sol Process for the preparation of stable silica sol

1980-02-08

1982-08-10

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

10628734, 252450, B01J 1300

Patent

active

043437176

ABSTRACT:
Stable, colloidal, silica sol is provided by a process which comprises vigorously mixing a slurry of calcium silicate with a dilute acid having a pK.sub.a value of less than about 8, such as sulfuric acid, and thereafter separating the sol from the insoluble precipitate of calcium salt. The process provides an inexpensive method for production of the sol as opposed to those methods which currently use sodium silicate as the starting material.

REFERENCES:
patent: 2940939 (1960-06-01), Podschus et al.
patent: 3494874 (1970-02-01), Flanigen et al.
patent: 3929493 (1975-12-01), Lee, Jr. et al.
Iler: The Chemistry of Silica, publ. by John Wiley & Sons, 1979, pp. 222-233 and 364-365.

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