Low temperature and pressure continuous reduction of copper in a

Details Low temperature and pressure continuous reduction of copper in a Low temperature and pressure continuous reduction of copper in a

1976-06-14

1977-07-26

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 5A, 75117, 204106, 204108, 423 42, C22B 1512

Patent

active

040380700

ABSTRACT:
Copper values are recovered from an acidic solution of solubilized cupric ions by the reduction of cupric copper to cuprous copper with hydrogen gas in the presence of a solid hydrogenation catalyst and in the presence of a cuprous ion stabilizing ligand. Catalyst poisoning by precipitation of copper metal on the surface of the catalyst during the reduction is avoided by controlling the ratio of Cu.sup.+/ligand/Cu.sup.+.sup.+ and by terminating the hydrogenation before copper metal precipitates on the catalyst. The solution containing the cuprous ions is separated from the solid catalyst and the cuprous ions are then disproportionated to produce copper metal and cupric ions.
The removal of the last amounts of cupric ions from solutions, after several stages of reduction and disproportionation is achieved by allowing the cupric ions to precipitate on the catalyst as copper metal. The catalyst is then separated from the copper barren raffinate and regenerated by exposing it to a fresh pregnant cupric ion solution in the presence of a cuprous ion stabilizing ligand.

REFERENCES:
patent: 2440612 (1948-04-01), Lichtenwalter
patent: 3844763 (1974-10-01), Burkin
patent: 3865580 (1975-02-01), Hummel
patent: 3865744 (1975-02-01), Parker et al.
patent: 3883351 (1974-09-01), Neskorg 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.
patent: 3983017 (1976-09-01), Szabo

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