Extraction of pre-reduced lateritic ores with aqueous sulphuric

Details Extraction of pre-reduced lateritic ores with aqueous sulphuric Extraction of pre-reduced lateritic ores with aqueous sulphuric

1979-07-26

1981-11-17

Hearn, Brian E.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423140, 423146, 423147, C22B 2304, B01D 1102

Patent

active

043011250

ABSTRACT:
In a process according to the present invention pre-reduced lateritic ores containing iron and nickel are leached with an aqueous sulphuric acid leach liquor containing or into which is introduced in the presence of the ore a peroxidant selected from hydrogen peroxide and peroxymonosulphuric acid. By so doing, the liquor is obtained with a lower concentration of iron than if the peroxidant had not been employed.
In preferred embodiments the leaching is carried out at from 40.degree. to 70.degree. C. for a period of 1 to 5 hours; when hydrogen peroxide is used, it is preferably introduced continuously or progressively throughout the reaction period and when peroxymonosulphuric acid is used it is preferably introduced initially. The acidity of the liquor can be reduced at the end of the reaction to pH3 to 4 to further lower the content of iron in solution.

REFERENCES:
patent: 2197185 (1940-04-01), Kissock
patent: 3146091 (1964-08-01), Green
patent: 3738867 (1973-06-01), Franz
patent: 4096233 (1979-05-01), Bodson
patent: 4198377 (1980-04-01), Burkin et al.
Schemb et al., Hydrogen Peroxide, Reinhold Pub. Corp., N.Y., (1955) pp. 125, 373, 396, 397, 403, 404, 592-595, 661-664.

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