The leaching of copper using thiosulfate reagent as an alternative reagent to cyanide has been investigated\r\nsince it is almost presented in gold thiosulfate leaching. This paper addressed the investigation of adsorption of\r\ncopper complexes on anion exchange resin in non-ammoniacal and ammoniacal thiosulfate leaching systems.The\r\nwork provided the experimental procedures for the adsorption of copper complexes on strong based anion exchange\r\nresin in non-ammoniacal and ammoniacal resin-solution systems. The result showed that increasing ammonia in the\r\nsolution resulted in the diminishing total copper complexes on the resin. As the solution pH of resin-solution systems\r\nwas maintained by the ammonia solution added in the system, the same effect of ammonia on the total copper\r\ncomplexes on resin was also shown. Overall, non-ammoniacal resin-solution system gave much better adsorption\r\nisotherm of copper complexes on resin, and the dominant species copper complexes on the strong based anion\r\nexchange resin was expected to be Cu(S2O3)3\r\n based on leaching modelling.
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