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The treatment of the effluent produced in the cyanidation of gold and silver ores is one of the main problems that the precious metals industry currently faces. These effluents contain variable amounts of free and complex cyanide (stable and unstable). Different methods for the cyanide elimination have been used; nevertheless, most of the times the consumption of reagents increases operating costs...
Most of the gold and silver produced worldwide are extracted by the cyanidation process. The recovery of the precious metals involves two distinct operations: the oxidative dissolution of gold and silver by an alkaline cyanide solution, and the reductive precipitation of metals from the solution. From the cyanidation point of view, gold and silver ores can be classified as free milling, and refractory...
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