Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1974-09-23
1977-03-15
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423150, C01G 3714, C01G 5110, C01G 5310
Patent
active
040124843
ABSTRACT:
A method is provided for separating chromium from lateritic ore. The ore which generally also contains nickel and cobalt along with other metal values is leached with a strong sulfuric acid solution of about 10 to 30 normal concentration at an acid to ore ratio of at least 3:1 by weight. The leaching is carried out at a temperature of at least 100.degree. C ranging as high as about 300.degree. C at above atmospheric pressure. An oxidant, such as manganese dioxide, is preferably added to oxidize the chromium to the hexavalent state, the manganese dioxide, or its equivalent, being advantageous in improving the chromium yield at the lower end of the leaching temperature range.
REFERENCES:
patent: 3082080 (1963-03-01), Simons
patent: 3466144 (1969-09-01), Kay
patent: 3804613 (1974-04-01), Zundel
Zhur. Prikl. Khim. 11 (1938) pp. 1564-1574, Losev et al.
Chemical Abstracts vol. 62, 1965, No. 14,222h.
Chemical Abstracts vol. 33, 1939 No. 6003.sup.4.
Chromium (Udy, author), vol. II, Reinhold Pub. Corp. 1965 pp. 30, 31.
Amax Inc.
Hearn Brian E.
Kalil Eugene J.
Serijan Kasper T.
Vertiz O. R.
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