Recovery of precious metal values from refractory ores

Details Recovery of precious metal values from refractory ores Recovery of precious metal values from refractory ores

1993-10-26

1995-06-20

Bos, Steven

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423 27, 423 29, 423 28, 4233942, 423 22, C22B 1100, C01G 5500, C01B 2140

Patent

active

054258006

ABSTRACT:
A hydrometallurgical process is described for recovery of precious metals from ores refractory to treatment by lixiviating agents by crushing the ore to no finer than a nominal 1/4 inch size, treating the ore with about 100% to about 300% of the stoichiometric amount of nitric acid required to react with the ore, maintaining the reaction mixture until the reaction is substantially complete, placing the treated ore in a permeable ore bed, washing the permeable ore bed to remove nitric acid, placing the washed ore in a heap permeable ore bed and passing a lixiviate solution for precious metals through the bed and recovering the dissolved precious metal from the lixiviate solution. All NOx gases generated during the reaction of nitric acid with the ore are recovered for conversion into nitric acid which is recycled for treating ore.

REFERENCES:
patent: 636114 (1899-10-01), Cain et al.
patent: 1810487 (1931-06-01), Lawr
patent: 3099529 (1963-07-01), Hatch et al.
patent: 3793429 (1974-02-01), Queneau et al.
patent: 3888748 (1975-06-01), Brennecke
patent: 4331469 (1982-05-01), Kunda
patent: 4647307 (1987-03-01), Raudsepp et al.
patent: 4670051 (1987-06-01), Schneider
patent: 4834793 (1989-05-01), Schneider et al.
patent: 4878945 (1989-11-01), Raudsepp et al.
patent: 4898611 (1990-02-01), Gross
patent: 5013359 (1991-05-01), Fair et al.
patent: 5196052 (1993-03-01), Gross et al.
patent: 5236492 (1993-08-01), Shaw et al.

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