Aqueous oxidation of sulfidic silver ore

Details Aqueous oxidation of sulfidic silver ore Aqueous oxidation of sulfidic silver ore

1992-05-20

1993-10-26

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 344

Patent

active

052561895

ABSTRACT:
Refractory sulfidic silver ore which is not amenable to cyanide leaching is formed into an aqueous slurry and oxidized at elevated temperature, usually about 150.degree. to 250.degree. C., in the presence of an oxidizing agent, usually oxygen, and in the presence of about 30 to about 160 g/L zinc. Zinc present in the above range results in increased extractability of silver from the oxidized residue by cyanide leaching.

REFERENCES:
patent: T104001 (1984-03-01), Kunter et al.
patent: 2777764 (1957-01-01), Hedley et al.
patent: 2810638 (1957-10-01), Hazen
patent: 4188208 (1980-02-01), Guay
patent: 4571263 (1986-02-01), Weir et al.
patent: 4578163 (1986-03-01), Kunter et al.
patent: 4610724 (1986-09-01), Weir et al.

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