New insights into the extraction of invisible gold in a low-grade high-sulfur Carlin-type gold concentrate by bio-pretreatment
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第10期
论文作者：Xiao-bin Qiu Jian-kang Wen Song-tao Huang Hong-ying Yang Mei-lin Liu Biao Wu
文章页码：1104 - 1111
摘 要：To extract gold from a low-grade（13.43 g/t） and high-sulfur（39.94wt% sulfide sulfur） Carlin-type gold concentrate from the Nibao 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.
Xiao-bin Qiu1,2，Jian-kang Wen1，Song-tao Huang1，Hong-ying Yang2，Mei-lin Liu1，Biao Wu1
1. National Engineering Laboratory of Biohydrometallurgy, General Research Institute for Nonferrous Metals2. School of Metallurgy, Northeastern University
摘 要：To extract gold from a low-grade（13.43 g/t） and high-sulfur（39.94wt% sulfide sulfur） Carlin-type gold concentrate from the Nibao 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.
关键词：
