Method for manufacturing alkali chromates from chromium ore

Details Method for manufacturing alkali chromates from chromium ore Method for manufacturing alkali chromates from chromium ore

1994-09-28

1996-04-09

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423596, C01G 3714

Patent

active

055059180

ABSTRACT:
A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.

REFERENCES:
patent: 3095266 (1963-06-01), Lander et al.
patent: 3336102 (1967-08-01), Hultman et al.
patent: 4162295 (1979-07-01), Subbanna et al.
patent: 4244925 (1981-01-01), Subbanna et al.
patent: 5374408 (1994-12-01), Bruzzone et al.
Derwent Abstract of SU0412149 (Jul. 23, 1971).

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