Biooxidation-thiosulfate leaching of refractory gold concentrate

作     者：He-fei Zhao Hong-ying Yang Lin-lin Tong Qin Zhang Ye Kong He-fei Zhao;Hong-ying Yang;Lin-lin Tong;Qin Zhang;Ye Kong

作者机构：Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education)Northeastern UniversityShenyang 110819China School of MetallurgyNortheastern UniversityShenyang 110819China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2020年第27卷第8期

页      面：1075-1082页

核心收录：

学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：financially supported by the Special Funds for the National Natural Science Foundation of China(No.U1608254) the Open Fund of State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores(No.ZJKY2017(B)KFJJ01 and ZJKY2017(B)KFJJ02) 

主　　题：thiosulfate leaching gold biooxidation refractory gold concentrate process mineralogy 

摘      要：A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was *** studies on the concentrate showed that very fine gold grains(10μm)were encapsulated in pyrite and arsenopyrite,while the proportion of monomer gold was only 21%.The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold *** gold leaching efficiency obtained by direct cyanidation was only 59.86%.After biooxidation pretreatment,the sulfide minerals were almost completely decomposed,92 wt%of the mineral particles of the biooxidation residue were decreased to38μm,and the proportion of monomer gold in the biooxidation residue was over 86%.Meanwhile,the gold content in the biooxidation residue was enriched to 55.60 g/t,and the S,Fe,and As contents were reduced to approximately 19.8 wt%,6.97 wt%,and 0.13 wt%,*** thiosulfate was used for gold extraction from the biooxidation residue of the refractory gold *** results showed that the optimal reagent conditions were 0.18 M thiosulfate,0.02 M copper(II),1.0 M ammonia,and 0.24 M *** these conditions,a maximum gold leaching efficiency of 85.05%was obtained.