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Carbon-Sulfur-Arsenic-Bearing Gold Ores

     

This method belongs to the technical field of the metallurgical industry.

First, fine grinding is conducted to break the inclusions in carbon-sulfur-arsenic-bearing gold ore and liberate the encapsulated gold, creating favorable conditions for subsequent gold leaching. Next, gold is concentrated through jet-pulsed flotation, which effectively reduces the volume of ore to be processed in follow-up procedures.

Subsequently, oxidation reactions are carried out to convert arsenic into arsenate, sulfur into sulfate, and passivate the carbonaceous matter, so that fine-grained gold particles are fully exposed. After that, precipitation reactions are performed to transform arsenic into stable scorodite, eliminating the risk of arsenic re-leaching; meanwhile, sulfate and carbonate are converted into calcium sulfate and calcium carbonate respectively. Calcium carbonate is then separated and removed, and caustic soda (sodium hydroxide) is regenerated for recycling.

A cyanide-free gold leaching agent is adopted to extract gold from the pretreated gold ore with carbon, sulfur and arsenic removed. This green and eco-friendly reagent contains no toxic cyanide, and is environmentally compatible.

The entire green gold leaching process operates under ambient temperature and pressure at a near-neutral condition (pH 6–8), making it suitable for wide promotion and application.

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