Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1988-07-19
1990-12-25
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75743, 75747, 423 27, 423 29, 423 30, 423 31, C01G 500, C01G 700, C22B 1100
Patent
active
049799878
ABSTRACT:
Precious metal values, particularly gold and silver, are liberated from refractory, carbonate ores by adjusting the molar ratio of sulfide to total acid consumers to between about 1.2 and about 3.2 in the ore feed to a pressure oxidation process. The ore is contacted with oxygen to oxidize sulfide in the ore with at least about 65 percent of the sulfide oxidation occurring in a first oxidation zone at a temperature above about 360.degree. F. The oxidation of sulfide forms at least about 5 grams of free sulfuric acid in the first oxidation zone. The oxidation process is continued in subsequent oxidation zones. A gas stream is removed from the oxidation zones and oxygen is separated from carbon dioxide and other inerts in the gas stream and the purified oxygen is recycled to the oxidation zones.
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Mason Peter C.
O'Kane Patrick T.
Pendreigh Robert
Bos Steven J.
Doll John
First Miss Gold, Inc.
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