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Green Leaching Method

     

Green Leaching Method for Polymetallic Sulfide-Carbon Ores

This green leaching method is employed in the polymetallic sulfide-carbon ores industry, utilizing metallurgical engineering techniques.

Fine grinding is used to break down the mineral structure of the polymetallic sulfide-carbon ores, facilitating gold leaching; pulsed slurry flotation is utilized to concentrate gold while minimizing mineral processing amount; subsequent oxidation reactions convert arsenic into soluble arsenic salts and sulfur into sulfate salts, with carbon undergoing carburization to expose fine gold particles. Finally, a precipitation reaction transforms arsenic into stable "aristolochia," preventing its dissolution, while sulfate and carbonate salts are converted into calcium sulfate and calcium carbonate. Calcium carbonate is removed, and sodium hydroxide is regenerated for reuse in the process cycle.

This green leaching method employs non-cyanide leaching agents for gold extraction from sulfide-carbon-arsenic ores, utilizing environmentally friendly, nontoxic reagents. The process operates under ambient temperature and pressure (pH of approximately 6–8), making it suitable for widespread application.

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