Process for the manufacture of high purity silicic acid

Details Process for the manufacture of high purity silicic acid Process for the manufacture of high purity silicic acid

1979-08-30

1981-04-28

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423338, 423340, C01B 3312

Patent

active

042645646

ABSTRACT:
A process is herein described for the manufacture of high purity, granular silicic acid from aqueous alkali metal silicate solutions by acidification thereof, freezing and subsequently thawing the reaction mixture, and filtering, washing and drying the insoluble residue formed, in which the alkali metal silicate solutions have a molar ratio of SiO.sub.2 :Me.sub.2 O of from about 2:1 to 20:1, Me representing an alkali metal, and before freezing the aqueous alkali metal silicate solutions are adjusted to a pH value in the range of from about 2.5 to 6 and to a SiO.sub.2 content of from about 1 to 10 percent by weight by means of one or more aqueous solutions or suspensions of organic acids which complex aluminum, titanium, and iron ions and which form soluble alkali metal salts under the conditions of the process.

REFERENCES:
patent: 3433593 (1969-03-01), Remhardt et al.

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