Metal leaching from concentrates using nitrogen dioxide in acids

Details Metal leaching from concentrates using nitrogen dioxide in acids Metal leaching from concentrates using nitrogen dioxide in acids

1978-02-23

1980-02-19

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

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

Patent

active

041894618

ABSTRACT:
Sulfidic minerals containing metal values such as copper, silver, nickel, cobalt, molybdenum, zinc, iron, or mixtures thereof are leached in two stages. In the second stage, preleached minerals are oxidized with nitrogen dioxide to enable the metal values to be solubilized in the aqueous acidic leach liquor in that stage. During the reaction, the nitrogen dioxide is reduced to nitric oxide. The nitric oxide is oxidized to nitrogen dioxide by oxygen. The acidic metal bearing liquor from the second stage flows to a first stage where it preleaches fresh minerals. The metal bearing liquor is delivered from the first stage to metal recovery while preleached minerals are delivered to the second stage.

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
patent: 3888748 (1975-06-01), Brenneke
Boldt, The Winning of Nickel, Longmans Canada Ltd., Toronto, 1967, pp. 294, 295.

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