Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1976-09-07
1978-01-03
Peters, G. O.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
C01G 3700
Patent
active
040667340
ABSTRACT:
In the alkaline-oxidative disintegration of chromites into chromates with an alkali comprising reacting a chromium ore in the presence of oxygen and a diluent, and leaching the reaction mixture with at least one of water and/or a chromate-containing aqueous solution, the improvement which comprises reacting the residue obtained after leaching with an excess of alkali, based on the chromium oxide content of the residue, in the presence of oxygen, grinding the reaction mixture and, without leaching, employing the ground reaction mixture as an alkali source in another chromite disintegration cycle. The alkali reacted with the leaching residue is preferably sodium and/or potassium hydroxide and/or carbonate and is employed in about 100 to 400%, and preferably about 150 to 330%, of the stoichiometric amount based on the chromium oxide content of the leaching residue.
REFERENCES:
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patent: 1901939 (1933-03-01), Vetter
patent: 2381236 (1945-08-01), Udy
patent: 3510256 (1970-05-01), Schafer
patent: 3812234 (1974-05-01), Schafer et al.
Bockelmann Wolfgang
Jonas Heinz
Nieder-Vahrenholz Hans-Georg
Niederprum Hans
Bayer Aktiengesellschaft
Hearn Brian E.
Peters G. O.
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