Process for the production of soluble alkali silicates

Details Process for the production of soluble alkali silicates Process for the production of soluble alkali silicates

1986-10-15

1987-09-15

Garvin, Patrick P.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423332, C01B 3332

Patent

active

046938788

ABSTRACT:
A need exists for an economical process for the production of alkali silicates of high purity, especially soda-waterglass, from waste silicic acid. From a waste silicic acid occurring in the reaction of hexafluorosilicic acid with aluminum hydroxide, which is treated with hot 15-25% wt. hexafluorosilicic acid and then calcined preferably at 750.degree.-900.degree. C. in a flow of water vapor, alkali silicates can be obtained with low degree of impurity, which are suitable advantageously for the production of precipitated silicic acid.

REFERENCES:
patent: 1493708 (1924-05-01), Schneider
patent: 3870532 (1975-03-01), Biegler et al.
patent: 4597956 (1986-07-01), Hinchey et al.

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