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
75 5A, 75109, 75117, 423 23, C22B 1512
Patent
active
040323315
ABSTRACT:
Improvements are disclosed for a process of the type in which copper is produced by contacting an aqueous copper solution with a quinolic compound in an organic solvent to result in the precipitation and recovery of copper metal. In this type of process, the organic phase containing the extractant is separated from the copper depleted raffinate and the quinonic compound produced as a byproduct during copper precipitation may be reduced and used again for precipitating more metal salt.
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 ions in the copper solution is disclosed to increase the rate at which copper is precipitated.
The in-situ conversion of quinolic compound contained in the raffinate by oxidation to the quinonic compound is also disclosed to reduce extractant losses in the aqueous phase.
A solvent system in which the percentage of aromatic 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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