Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1988-12-30
1990-11-20
Stoll, Robert L.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75105, 423 29, 423 31, C22B 1104
Patent
active
049716255
ABSTRACT:
A method for leaching gold and/or silver out or other precious metal containing substance using cyanide-containing leaching solutions and adding an aqueous H.sub.2 O.sub.2 solution to accelerate leaching. The total amount of the hydrogen-peroxide solution required for leaching is fed into the leaching slurry at the beginning of leaching. The amount of the H.sub.2 O.sub.2 solution is determined in that the H.sub.2 O.sub.2 is added in a 0.6 to 2.5-fold stoichiometric ratio to the cyanide concentration of the leaching slurry. The pH value of the leaching slurry is set and maintained at between 7 and 10 or between 11 and 13.
REFERENCES:
patent: 732605 (1903-06-01), Thede
patent: 3203968 (1965-08-01), Sebba
patent: 3339730 (1967-09-01), Boutin et al.
patent: 3826723 (1974-07-01), Woods et al.
patent: 4421724 (1983-12-01), Hunnel
patent: 4786318 (1988-11-01), Owen et al.
Davidson, R. J. et al. "The Intensive Cyandation of Gold-Plant Gravity Concentrates", J. of S. African Inst. of Min. and Met., Jan. 1978 pp. 146-165.
Day, E. L. "Some Factors Influencing the Rate of Dissolution of Gold in Sodium Cyanide Solutions", Presented at Annual Meeting of Canadian Gold Metallurgists, Ottawa, Jan. 17-19, 1967, pp. 55-60.
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Stoll Robert L.
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