Copper leaching employing nitrogen dioxide as oxidant

Details Copper leaching employing nitrogen dioxide as oxidant Copper leaching employing nitrogen dioxide as oxidant

1977-11-30

1979-01-02

Hearn, Brian

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 53, 423109, 423150, 423 41, C01G 310, C01G 906, C01G 5110, C01G 5310

Patent

active

041327586

ABSTRACT:
Sulfidic minerals containing metal values such as copper, silver, nickel, cobalt, molybdenum, zinc, iron, or mixtures thereof are oxidized with nitrogen dioxide to enable the metal values to be solubilized in an aqueous acidic leach liquor. In practicing the invention, the minerals are added to an aqueous acidic leach liquor and a nitrogen dioxide containing gas is sparged through the slurry to oxidize the metal values. During the reaction, the nitrogen dioxide is reduced to nitric oxide. The nitric oxide is oxidized to nitrogen dioxide by oxygen, either in-situ, or in a separate off-gas oxidizer.

REFERENCES:
patent: 287737 (1883-10-01), Stetefeldt
patent: 653414 (1900-07-01), Fink
patent: 1150787 (1915-08-01), Rankin
patent: 2871116 (1959-01-01), Clark
Cotton et al. Advanced Inorganic Chemistry, 2nd Edition, Interscience Publishers, N.Y. 1966 pp. 342-347.

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