New insights into the extraction of invisible gold in a low-grade high-sulfur Carlin-type gold concentrate by bio-pretreatment |
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Authors: | Xiao-bin Qiu Jian-kang Wen Song-tao Huang Hong-ying Yang Mei-lin Liu Biao Wu |
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Institution: | 1. National Engineering Laboratory of Biohydrometalurgy,General Research Institute for Nonferrous Metals,Beijing 100088,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;2. National Engineering Laboratory of Biohydrometalurgy,General Research Institute for Nonferrous Metals,Beijing 100088,China;3. School of Metallurgy,Northeastern University,Shenyang 110819,China |
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Abstract: | To extract gold from a low-grade (13.43 g/t) and high-sulfur (39.94wt% sulfide sulfur) Carlin-type gold concentrate from the Ni-bao deposit, Guizhou, a bio-pretreatment followed by carbon-in-pulp (CIP) cyanide leaching process was used. Various methods were used to detect the low-grade gold in the concentrate; however, only time-of-flight secondary-ion mass spectrometry (TOF-SIMS) was successful. With bio-pretreatment, the gold recovery rate increased by approximately 70.16% compared with that obtained by direct cyanide leaching of the concentrate. Various attempts were made to increase the final gold recovery rate. However, approximately 20wt% of the gold was non-extractable. To determine the nature of this non-extractable gold, mineralogy liberation analysis (MLA), formation of secondary product during the bio-pretreatment, and the preg-robbing capacity of the carbonaceous matter in the ore were investigated. The results indicated that at least four factors affected the gold recovery rate: gold occurrence, tight junctions of gold-bearing pyrite with gangue minerals, jarosite coating of the ore, and the carbonaceous matter content. |
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Keywords: | gold ore invisible gold bio-pretreatment mineralogy liberation analysis secondary product carbonaceous matter |
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