A novel technique for silver extraction from Ag_2S is described. The method utilizes thiosulphate as complexing reagent and the redox reaction between SO_2 added as Na_2SO_3 powder and H_2S gas evolved. The parameters of the reaction such as pH, the reaction temperature, the complex equilibrium of Ag^+ ion with thiosulphate and the solubility of Ag_2S were investigated. Silver ions, obtained by this means are collected in high purity (99%) by applying appropriate electrolysis conditions. The interference from other metallic impurities, namely copper, gold, iron and zinc, is eliminated by choosing an appropriate electrolysis potential.
Silver recovery, silver extraction, thiosulphate leaching
AYATA, SEVDA and YILDIRAN, HÜSEYİN (2001) "A Novel Technique for Silver Extraction from Silver Sulphide Ore," Turkish Journal of Chemistry: Vol. 25: No. 2, Article 8. Available at: https://journals.tubitak.gov.tr/chem/vol25/iss2/8