Recovery of gold from refractory gold ores: Effect of pyrite on the stability of the thiourea leaching system

作     者：Hong Qin Xue-yi Guo Qing-hua Tian Lei Zhang Hong Qin;Xue-yi Guo;Qing-hua Tian;Lei Zhang

作者机构：School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China National&Regional Joint Engineering Research Center of Nonferrous Metal Resource RecyclingChangsha 410083China 

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：2021年第28卷第6期

页      面：956-964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：This work was financially supported by the National Natural Science Foundation of China(No.51922108) the Hunan Natural Science Foundation(No.2019JJ20031) the Hunan Key Research and Development Program(No.2019SK2061) 

主　　题：thiourea leaching stability pyrite refractory gold ores 

摘      要：The extraction of gold from refractory gold ores(RGOs)without side reactions is an extremely promising ***,most RGOs contain large amounts of sulfide,such as ***,investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of *** this work,the effects of pyrite on the stability of the thiourea system were systematically investigated under different *** showed that the decomposition rate of thiourea was accelerated sharply in the presence of *** effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of *** decomposition efficiency of thiourea decreased by 40%and the recovery efficiency of gold increased by 56%after the removal of sulfide by *** optimal conditions,the efficiency of the gold recovery system increased to 83.69%and only 57.92%of thiourea decomposition was *** high consumption of thiourea by the leaching system may be attributed to not only adsorption by mineral particles but also catalytic decomposition by some impurities in the ores,such as pyrite and soluble ferric oxide.