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http://dx.doi.org/10.9727/jmsk.2016.29.3.113

The Efficiency of Fe Removal Rate from Gold Ore in the Oxidation Zone by Ammonia Leaching  

Kim, Bong-Ju (Dept. of Energy and Resource Engineering, Chosun University)
Cho, Kang-Hee (Dept. of Rural Systems Engineering/Research Institute for Agriculture and Life Science, Seoul National University)
Choi, Nag-Choul (Dept. of Rural Systems Engineering/Research Institute for Agriculture and Life Science, Seoul National University)
Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.29, no.3, 2016 , pp. 113-122 More about this Journal
Abstract
This study aims to improve the recovery of gold and silver by removing hematite from gold ore of an oxidation zone with ammonia solution. Quartz, hematite and muscovite were present in the oxidation zone, while hematite was hydrogenous. As a result of performing an ammonia leaching test on variables, it is found that the maximum Fe leaching parameter was $-45{\mu}m$ particle size, 1.0 M sulfuric acid concentration, 5.0 g/l ammonium sulfate concentration and 2.0 M hydrogen peroxide concentration. It is also confirmed that goethite was precipitated and formed from that ammonia elution. As the amount of Fe-removal was increased in a solid-residue, the recovery of Au and Ag were increased, too.
Keywords
Oxidation zone; Hematite; Ammonia leaching; Goethite; Gold recovery;
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