Oxidation process for releasing metal values in which nitric aci

Details Oxidation process for releasing metal values in which nitric aci Oxidation process for releasing metal values in which nitric aci

1985-03-19

1987-06-02

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75117, 75118R, 75119, 75120, 75121, C22B 300

Patent

active

046700510

ABSTRACT:
An oxidation process for releasing a metal of interest in an ore is described. The process is especially useful for releasing a metal of interest entrapped in a refractory ore. The process comprises reacting the ore with nitric acid until sufficient oxidation has occurred to release the metal of interest so that it may be recovered by conventional techniques. Nitric acid is regenerated in situ by aerating the liquid medium and contacting it with the off gases generated by the oxidation. The process is continuous and the nitric acid is recycled to the reactor preferably after removal of accumulated sulfate and dissolved metal cations.

REFERENCES:
patent: 3966462 (1976-06-01), Posel et al.
patent: 3992270 (1976-11-01), Lemarinel et al.
patent: 4132758 (1979-01-01), Frankiewicz et al.
patent: 4250149 (1981-02-01), Welsh
patent: 4361541 (1982-11-01), Bings et al.

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