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Ammoniacal thiosulphate leaching of gold
ore Ammoniacal
thiosulphate leaching of gold finds a better substitute as it is non-toxic and
environmentally safe as compared to the toxic cyanide system for gold extraction. In the
present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate
leaching of gold ore samples from two different mines namely Akeshi and Hishikari of
Japan. In this study, the effect of thiosulphate concentration, effect of ammonia, effect
of cupric ions, and few other variables affecting the gold leaching have been studied. The
ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate
concentration. The leaching is improved significantly at a particular ratio of ammonia to
thiosulphate concentration and that ratio varies from ore to ore. Copper ions act as an
oxidant and the gold dissolution increases substantially in the presence of them. The gold
leaching is minimum in the presence of an inert gas such as nitrogen and the leaching
increases in presence of other gases like oxygen and air. |
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