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http://dx.doi.org/10.9719/EEG.2013.46.1.21

Optimization of Gold Leaching from the Refractory Sulfide Concentrate by HCl-NaClO-FeCl3 Solution  

Kim, Bong-Ju (Department of Energy and Resource Engineering, Chosun University)
Cho, Kang-Hee (Department of Energy and Resource Engineering, Chosun University)
Lee, Jong-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
Economic and Environmental Geology / v.46, no.1, 2013 , pp. 21-28 More about this Journal
Abstract
In order to optimize gold leaching from refractory sulfide concentrate, a HCl-NaClO-$FeCl_3$ solution with varying attributes was applied to the roasted concentrate from Uil mine. The gold from Uil mine occurs in the form of invisible gold that is difficult to leach. The results of the gold leaching experiments showed that the best gold leaching parameters were $550^{\circ}C$ of roasting temperature, 2.0 M of concentration, 1.0% of pulp density, and $70^{\circ}C$ of leaching temperature. It is confirmed that the HCl-NaClO-$FeCl_3$ solution was an environmentally friendly method to leach gold and silver from the refractory sulfide concentrate as an alternative lixiviant to cyanide.
Keywords
gold leaching; optimization; roasted concentrate; HCl-NaClO-$FeCl_3$ leaching solution; invisible gold;
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