Gold Precipitation From Cyanide Solution

1 process for selective recovery of silver and gold from cyanide solutions containing both metals comprising 1 adding to the solution about 0to 2pound cao per ton of solution, 2 treating the resulting solution with sodium sulfide in an amount of about 110 to 150 percent of the stoichiometric amount to precipitate the silver as silver sulfide, 3 filtering to remove the.

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