Copper(I) speciation in mixed thiosulfate-chloride and ammonia-chloride solutions: XAS and UV-Visible spectroscopic studies
Thiosulfate and ammonia mixtures may be more environmentally benign alternatives to cyanide for leaching Au from ores. In this method, the Cu(i)/Cu(ii) couple acts as a redox mediator aiding in the oxidative dissolution of metallic Au. Information about the speciation of Cu(i) and Cu(ii) in these lixiviant solutions is paramount to the optimization of gold ore processing conditions. With this in mind, we have carried out XANES, EXAFS and UV-Vis spectroscopic studies of the speciation of Cu(i)...[Show more]
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