Method for production of alkali metal chromates from chrome ores

Details Method for production of alkali metal chromates from chrome ores Method for production of alkali metal chromates from chrome ores

1979-07-20

1981-01-13

Hearn, Brian E.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 65, 423 68, 423596, C01G 3714, C01G 3100

Patent

active

042449251

ABSTRACT:
A method for producing alkali metal chromates by a single roast of chrome ores without the use of calcium oxide is disclosed. A double roast embodiment is also contemplated for obtainment of enhanced yields. The pollution and hygiene problems associated with the use of lime are substantially eliminated and only negligible amounts of alumina are found in the product chromate liquors without employing steps previously thought necessary. These advantages are achieved by controlling (1) the Bichromate Equivalent: aluminum oxide ratio in the mix, (2) the amount of alkali metal salts added to the mix, (3) the roasting time, (4) the composition and alkalinity of the liquor used for leaching the roast, and (5) the temperature employed. Recovery of vanadium values from the alkali metal chromate liquors is also disclosed.

REFERENCES:
patent: 2576445 (1951-11-01), Cole
patent: 2839359 (1958-06-01), Dunning
patent: 3816095 (1974-06-01), Bruen
patent: 3852059 (1974-12-01), Bruen
patent: 4162295 (1979-07-01), Subbana
Doerner et al., "A Study of Methods for Producing Chromate Salts from Domestic Ores," Bulletin V, Sep. 1939, pp. 8-13.

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