Process for improving the extraction yield of silver and gold in

Details Process for improving the extraction yield of silver and gold in Process for improving the extraction yield of silver and gold in

1985-03-05

1987-03-31

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 2, 75101R, 75105, 423 27, 423 29, 423 30, 423 31, 423 37, C22B 1104

Patent

active

046540792

ABSTRACT:
A process for the extraction of silver and gold from refractory ore is disclosed. The process includes first grinding the refractory ore. This ground refractory ore is subsequently treated with an alkali solution of a stoichiometric excess amount of sulphide in relation to the amount of gold and silver contained in the refractory ore, to thus form a pulp containing a gold and silver sulfide. The pulp and alkaline solution ore are aerated to oxidize the excess sulfide to sulfate and then a mixture of the pulp and cyanide liquor are formed. Finally this mixture is aerated to obtain a final gold and silver product.

REFERENCES:
patent: 3189435 (1965-06-01), Lower
patent: 3429694 (1969-02-01), Lower
patent: 4072587 (1978-02-01), Heinen et al.

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