Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1991-04-12
1992-06-23
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
C22B 1100
Patent
active
051239566
ABSTRACT:
Recovery of a precious metal value from refractory carbonaceous and sulfidic ores, concentrates or tailings which also include arsenic-containing components is improved by roasting the ore or ore concentrate in an oxygen-enriched gaseous atmosphere having an initial oxygen content from about 25 percent (by volume) to about 65 percent (by volume) while maintaining a reaction temperature of less than about 600 degrees Celsius during the roasting and while maintaining a minimum amount of iron to react with arsenic and for forming ferricarsenate; thereafter recovering a thus-roasted ore as calcine, whereby the calcine is amenable to recovery of precious metal values in it; gold ores are preferred candidate ores.
REFERENCES:
patent: 2878102 (1959-03-01), Sternfels
patent: 3172755 (1965-03-01), Vian-Ortuno
patent: 4731114 (1988-03-01), Ramadorai
patent: 4919715 (1990-04-01), Smith
Fernandez Rene R.
Hannaford Anthony L.
Le Vier K. M.
Ramadorai Gopalan
Keire Fred A.
Newmont Gold Company
Newmont Mining Corporation
Rosenberg Peter D.
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