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Recovering Gold and Copper

     

Method for Recovering Gold and Copper from Bioheap Leaching Tailings of Copper Ores

Medium Conversion:Medium conversion is carried out in sequence: The discarded bioheap leaching tailings of copper ores undergo three-stage medium conversion without unloading the heap. Mine-sourced alkaline wastewater supplemented with lime and sodium hydroxide solution is sprayed onto the heap, with the pH value of the effluent discharged from the heap bottom controlled to above 10.5, to obtain the discarded copper ore bioheap leaching tailings after medium conversion.

Cyanidation Spray Leaching:The medium-converted discarded copper ore bioheap leaching tailings are treated with four-stage cyanidation spray leaching using sodium cyanide solution to obtain the pregnant leach solution.

Copper Recovery via Oxidative Cyanide Destruction:A cyanide destruction agent is added for oxidative cyanide breakdown and copper removal. The slag slurry after cyanide destruction and copper removal is processed by thickening, sedimentation and solid-liquid separation to produce filtrate and copper concentrate as the finished product. The overflow and filtrate are mixed and then sent for activated carbon adsorption, yielding the barren adsorption solution and gold-loaded activated carbon as the finished product.

This method features low investment, short processing cycle and low cost. The gold content in the final tailings is less than 0.07 g/t, while the total copper recovery rate exceeds 35%. It can be scaled up into industrial production lines, with simple operation, strong adaptability and environmental friendliness, and is suitable for the comprehensive resource recovery of solid waste residues in the non-ferrous metallurgy industry.

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