Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1992-07-29
1993-08-17
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C22B 300, C22B 302
Patent
active
052364925
ABSTRACT:
A hydrometallurgical process is described for recovery of a precious metals from ores refractory to treatment by lixiviating agents by crushing the ore to no finer than a nominal 1/4 inch size, acidifying the ore with a mineral acid, treating the ore to a preliminary oxidation with nitric acid, optionally adding a binder to the oxidized ore, heap treating the ore with nitric acid to complete oxidation of the ore, water washing the heaped ore, optionally increasing the alkalinity of the heaped ore, heap treating the ore with a lixiviating solution and recovering precious metals from the lixiviating solution. The process recovers NO.sub.x gases generated during the preliminary oxidation and binder addition stage for conversion into nitric acid which is recycled for treating ore. Chemical treatments in the process can be carried out at ambient temperatures and atmospheric pressures.
REFERENCES:
patent: 3793429 (1974-02-01), Queneau et al.
patent: 3888748 (1975-06-01), Brennecke
patent: 4647307 (1987-03-01), Raudsepp et al.
patent: 4739973 (1988-04-01), Herndon
patent: 5005806 (1991-04-01), Krauth
Buter Larry J.
Shaw Douglas R.
Andersen Robert L.
FMC Gold Company
Ianno Frank
Rosenberg Peter D.
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