Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1976-09-03
1977-06-28
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75109, 75 5A, 75117, 423 23, C22B 1512
Patent
active
040323323
ABSTRACT:
Improvements are disclosed for a process of the type in which copper metal is produced by contacting an aqueous solution containing copper ions with a quinolic compound to result in the precipitation of copper metal. In this type of process, a quinonic compound is also produced during copper precipitation and it may be reduced to the quinolic compound for reuse in precipitating more copper metal.
A two step reduction of copper is disclosed. In a first step, cupric copper is reduced to cuprous copper and in the second step, cuprous copper is reduced to copper metal.
The inclusion of selected concentrations of chloride aromide and thiocyanate ions in the copper solution is disclosed to increase the rate at which copper is precipitated.
The in-situ conversion of the quinolic compound contained in the raffinate to the quinonic compound is also disclosed to reduce extractant losses in the aqueous phase.
A solvent system in which the percentage of nonpolar solvent in a mixed organic solvent system is increased is also disclosed to increase the rate of reduction of copper metal.
REFERENCES:
patent: 2390540 (1945-12-01), Keller
patent: 2813020 (1957-11-01), VanHare
patent: 3785944 (1974-01-01), Atwood et al.
patent: 3798026 (1974-03-01), Milner et al.
patent: 3820979 (1974-06-01), Manassen
patent: 3838178 (1974-09-01), Vaughan
patent: 3923966 (1975-12-01), Vaughan
patent: 3940261 (1976-02-01), Dannelly et al.
patent: 3962288 (1976-06-01), Vaughan
Kennecott Copper Corporation
Lorusso Anthony M.
Ozaki G.
Sniado John L.
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