Gold Extraction by Thiosulphate Leaching in New Catalytic System
In order to determine a new type of gold leaching system,which can not only bring good leaching effect with low consumption of thiosulfate,but also make the gold in the lixivium to be efficiently recovered,the leaching effects of gold with thiosulfate catalyzed by different combination of metal ions and organic ligands were compared,and then the gold in the lixivium was recovered by resin adsorption.The results indicate that the Ni2+-glycine-thiosulfate system can bring good Au leaching effect,showing Au leaching rate up to 89.72%with thiosulfate consumption of 15.28 kg/t.During the gold leaching process in this system,glycine catalyzes the coordination of Au+with S2 O32-and also stabilizes Ni2+under alkaline conditions,and Ni(C2 H4 NO2)20 catalyzes the reduction of O2.When Au is recovered by resin adsorption,Ni ions in the lixivium are hardly adsorbed on the resin,and do not compete with Au ions for adsorption,resulting in Au adsorption rate up to 98.13%.Then,only one-step process is required for desorption of gold-loaded resin,that is,Au can be directly desorbed.
metal ionorganic ligandsadsorbdesorbcatalytic systemthiosulfate methodresin adsorptiongold extraction
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