Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1979-12-13
1981-03-31
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75106, 75107, 75118R, 423 29, C22B 1108
Patent
active
042591074
ABSTRACT:
Gold-bearing ore of sedimentary origin containing organic carbonaceous material and gold-bearing sulfides is treated to increase the recovery of the gold content thereof by standard cyanidation practice. An aqueous slurry of the finely ground ore is first subjected to a preliminary oxidation treatment wherein air or oxygen is bubbled through the slurry while maintaining the slurry at a temperature of from 167.degree. to 212.degree. F. for a period of from 8 to 24 hours. The oxygenated slurry is then cooled to a temperature of from 70.degree. to 125.degree. F. and acid is added to bring the pH of the slurry down to 6.0 of lower. Chlorine gas or an alkali metal or alkaline earth metal hypochlorite is then added to the slurry unitl the slurry will no longer absorb or react with these reagents. The thus treated slurry is maintained at a temperature of from 70.degree. to 125.degree. F. for a period of from 6 to 12 hours. The solids content of the slurry is then subjected to standard cyanidation, recovery of at least 75% of the gold content of the ore being obtained.
REFERENCES:
patent: 636114 (1899-10-01), Cain et al.
patent: 692634 (1902-02-01), Davis
patent: 1071791 (1913-09-01), Pugsley
patent: 3574600 (1971-04-01), Scheiner
patent: 3846124 (1974-11-01), Guay
patent: 4038362 (1977-07-01), Guay
Merck Index, Seventh Edn., Merck & Co., N.J., 1960, p. 548.
Schlesinger, General Chemistry, 4th Edn., Longmans, Green & Co., N.Y., 1953, pp. 422 & 423.
Newmont Exploration Limited
Ozaki G.
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