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http://dx.doi.org/10.9727/jmsk.2013.26.1.1

The Optimization of Silver Leaching from the Samjo Mine Concentrate by Thiourea  

Yang, Gwon-Seung (Department of Advanced Materials Engineering, Chosun University)
Kim, Bong-Ju (Department of Energy and Resource Engineering, Chosun University)
Choi, Nag-Choul (Engineering Research Institute, Chonnam National University)
Park, Cheon-Young (Department of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.26, no.1, 2013 , pp. 1-8 More about this Journal
Abstract
This study was carried out to test the possibility of using an environmentally friendly method of leaching silver concentrate from the Samjo mine. The Samjo mine ore contained minerals such as pyrite, chalcopyrite, galena, arsenopyrite, and sphalerite. The concentrate samples tested with the thiourea solution were roasted at $750^{\circ}C$. The results of different experimental conditions showed that the highest silver leaching rate was obtained when the concentration of thiourea was at 0.8 g with ferric sulfate at 0.425 g and the leaching temperature at $60^{\circ}C$. The Ag leaching rate obtained was 91.5% at a pulp density of 10%. However, in the XRD analysis, peaks of pyrite, galena, and hematite were still found in the leached solid residues in which the Ag leaching rate was the highest. it is expected that the unrecovered silver in the solid residue can be lost.
Keywords
thiourea; silver; roasted concentrate; ferric sulfate; leaching rate;
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