dry cyanide method 气体氰化法
ferric cyanide method 铁氰法
cyanide selective electrode method 氰离子选择电极法
non-cyanide copper plating method 无氰镀铜
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The method, which is said to have no discharge and no effluence, is considered cost-competitive with cyanide if the ore contains sulfites, Faucher said, but can be used with oxidized and mixed ores.
FORBES: Firm Uses Cyanide--Free Method To Leach Gold, Other Metals
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