A method of controlling the biological oxidation potential to enhance leaching of chalcopyrite

Abstract

A method for controlling biological oxidation potential to increase chalcopyrite leaching, aiming at the problems of low chalcopyrite leaching rate and high pyrite leaching rate, high cost of subsequent neutralization, large consumption of cyanide-breaking agent for bleaching powder of cyanide-containing wastewater containing copper, and waste of copper resources in solution, etc. The method uses cyanide in wastewater containing copper and cyanide to reduce cyanide-breaking cost and recover copper in wastewater containing copper and cyanide. HCN intervenes the oxidation cycle of ferrous iron to ferric iron in the biological oxidation process, reduces the biological oxidation potential, reduces the generation of chalcopyrite passivation film in the biological oxidation process by low-potential biological oxidation, and increases chalcopyrite leaching. Controlling low potential reduces pyrite leaching and subsequent neutralization cost. The reaction of hydrogen cyanide with high-iron bacterial solution generates Prussian blue and Ten's blue, which are non-toxic pigments, to reduce environmental pressure. The method has the advantages of reducing pyrite leaching and increasing chalcopyrite leaching, recycling waste, reducing cost, and improving efficiency, etc.

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