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Recovering Gold and Silver from Refractory Gold Ores

     

a method for recovering gold and silver from refractory gold ores, which falls into the field of metallurgy. It consists of two parts:

First, destroying the inclusions encapsulating gold and silver through hot pressure pre-oxidation, oxidizing organic carbon in the ore, and recovering sulfur contained in the ore;

Second, recovering gold and silver from the pre-leach residue via cyanidation or other cyanide-free leaching processes.

Recovery gold and silver from refractory gold ores, the total recovery rate of gold and silver exceeds 90%, which is 40 percentage points higher than that of the conventional cyanidation process, and the sulfur recovery rate is above 50% at the same time. The production cost of this process is approximately RMB 400 per ton of ore. Compared with bio-oxidation, two-stage roasting and conventional hot pressure oxidation processes,  can reduce investment and production cost, improve recovery efficiency, realize comprehensive recovery of multiple elements, and lower environmental pollution, with remarkable economic and social benefits.

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