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http://dx.doi.org/10.9727/jmsk.2019.32.2.113

Gold Recovery from Geumsan Concentrate Using Microwave-nitric Acid Leaching and Lead-fire Assay  

Lee, Jong-Ju (Department of Energy and Resource Engineering, Chosun University)
On, Hyun-Sung (Department of Energy and Resource Engineering, Chosun University)
Park, Cheon-Young (Department of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.32, no.2, 2019 , pp. 113-126 More about this Journal
Abstract
This study aimed to effectively dissolve sulfide minerals through microwave-nitric acid leaching of invisible gold concentrate and then recover gold from the solid-residue with fire assay. For the purposes, this study conducted microwave-nitric acid leaching experiments to examine nitric acid concentration, time of microwave leaching, and sample addition effect. As results of the experiments, this study discovered that the weight loss rate of solid-residue increased as nitric acid concentration and microwave leaching time increased while weight loss rate decreased as sample addition increased. In an XRD analysis with solid-residue, it was discovered that pyrite completely disappeared when the nitric acid concentrate was 6 M and the microwave leaching time was 18 minutes. When a fire assay was carried out with solid-residue, gold particles with more content were recovered as nitric acid concentration and microwave leaching time increased whereas gold particles with more gold content were recovered as the sample addition decreased.
Keywords
invisible gold concentrate; microwave-nitric acid leaching; lead-fire assay; gold particle;
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