Process for recovering chromic acid solution from a waste liquor

Details Process for recovering chromic acid solution from a waste liquor Process for recovering chromic acid solution from a waste liquor

1974-05-06

1976-06-01

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

210 37R, 210 38B, 210 42R, 423 55, C01G 3712

Patent

active

039610292

ABSTRACT:
From a chromate ion-containing aqueous waste liquor the chromate ion can be advantageously recovered in the form of chromic acid by the process comprising the steps of adding a reducing agent to the chromate ion-containing aqueous waste liquor to precipitate the chromate ion in the form of chromium (III) hydroxide; adding an alkali and aqueous hydrogen peroxide to the precipitated chromium (III) hydroxide to produce a chromate ion-containing aqueous solution; and passing the resultant chromate ion-containing aqueous solution through an H form acidic cation-exchange resin.

REFERENCES:
patent: 2733204 (1956-01-01), Costa
patent: 3658470 (1972-04-01), Zieuers et al.
patent: 3681210 (1972-08-01), Zieuers et al.
patent: 3787555 (1974-01-01), Bruen et al.
patent: 3847757 (1974-11-01), Smith
patent: 3856916 (1974-12-01), Le Francois et al.
patent: 3896209 (1975-07-01), Fournier et al.

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