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http://dx.doi.org/10.7844/kirr.2017.26.2.39

Leaching of the Mixture of Metallic Gold and Silver  

Xing, Weidong (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University)
Lee, Manseung (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University)
Publication Information
Resources Recycling / v.26, no.2, 2017 , pp. 39-45 More about this Journal
Abstract
In order to exclude the effect of uneven distribution of gold in anode slime, the dissolution of gold and silver from the metal mixture was investigated in different systems, such as the mixture of hydrochloric acid and oxidizing reagents ($H_2O_2$, NaClO and $HNO_3$), thiosulfate and thiourea. In the mixture of HCl and either $HNO_3$ or $H_2O_2$, Au was completely dissolved but the leaching percentage of Ag was around 1%. In both thiosulfate and thiourea solution, gold was not dissolved at all. The presence of ferric ion in acidic thiourea solution showed a favorable effect on the leaching of silver but further study is necessary to elucidate the combined effect of ferric ion and sulfuric acid.
Keywords
gold; silver; hydrochloric acid; thiosulfate; thiourea;
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