Methods of separating and recovering copper from materials conta

Details Methods of separating and recovering copper from materials conta Methods of separating and recovering copper from materials conta

1976-07-14

1978-01-24

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75108, 75115, 204106, 204108, 423 41, 423547, C22B 1512

Patent

active

040701832

ABSTRACT:
Cuprous sulphate solutions, suitable for thermal or electrochemical disproportionation to yield copper, are obtained by dissolving copper sulphites, such as Chevreul's salt or cuprous ammonium sulphite, in acetonitrile-water or 2 hydroxycyanoethane-water mixtures, preferably in the presence of cupric sulphate. This discovery is capable of a number of applications, one of which is the recovery of copper from chalcopyrite by the following five steps. An oxidizing roast of chalcopyrite such as to produce either cupric sulphate and/or copper oxide, leaching of cupric sulphate from the calcine, precipitation of Chevreul's salt and/or other copper sulphites with a soluble salt of sulphurous acid, including bisulphites, dissolution of the copper sulphite as cuprous sulphate, using cupric sulphate in an acetonitrile-water solution as oxidant; precipitation of pure copper by thermal disproportionation of the cuprous sulphate solution. Acetonitrile and acidic cupric sulphate solution may be recycled. Advantages over conventional processes, such as roast, leach-electrowin, or smelt, convert, electrorefine, include lower cost, lower energy consumption, sulphur removal as ammonium sulphate or gypsum, rather than as sulphur dioxide, and rapid throughput. The net reaction is: ##EQU1##

REFERENCES:
patent: 3865744 (1975-02-01), Parker et al.
patent: 3937657 (1976-02-01), Parker et al.
patent: 3961028 (1976-06-01), Parker et al.
patent: 3966890 (1976-06-01), Parker et al.

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