文献类型：期刊文献

英文题名：Study of gold leaching from pre-treated waste printed circuit boards by thiosulfate-cobalt-glycine system and separation by solvent extraction

作者：Hao, Juanjuan[1,4];Wang, Xiaolu[1];Wang, Yishu[1];Guo, Fu[1,2,3];Wu, Yufeng[1]

第一作者：Hao, Juanjuan

通讯作者：Wang, XL[1];Guo, F[1]

机构：[1]Beijing Univ Technol, Fac Mat & Mfg, Beijing 100124, Peoples R China;[2]Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China;[3]Beijing Union Univ, Coll Robot, Beijing 100101, Peoples R China;[4]Tech Ctr Inner Mongolia Baotou Steel Union Co Ltd, Baotou 014010, Inner Mongolia, Peoples R China

第一机构：Beijing Univ Technol, Fac Mat & Mfg, Beijing 100124, Peoples R China

通讯机构：[1]corresponding author), Beijing Univ Technol, Fac Mat & Mfg, Beijing 100124, Peoples R China.

年份：2023

卷号：221

外文期刊名：HYDROMETALLURGY

收录：;EI(收录号：20233314566481);Scopus(收录号：2-s2.0-85167776300);WOS:【SCI-EXPANDED(收录号:WOS:001059350100001)】；

基金：Acknowledgements This work was supported by the National Natural Science Foundation of China (Grant number 52201034) , General Program of Science and Technology Development Project of Beijing Municipal Education Com-mission (Grant number KM202210005007) and International Research Cooperation Seed Fund of Beijing University of Technology (Grant number 2021A13) .

语种：英文

外文关键词：Waste printed circuit boards; Gold recovery; Cobalt-glycine catalysis; Solvent extraction

摘要：The recovery of gold (Au) from waste printed circuit boards (WPCBs) derived from discarded mobile phones is crucial for the resource preservation and environmental protection. In this context, thiosulfate has emerged as a viable alternative to the toxic compound cyanide for Au leaching. However, the conventional thiosulfate leaching system has a main problem that is large thiosulfate consumption, which limits its commercial application. In this study, we developed a novel thiosulfate leaching system that utilizes a cobalt (Co(II))-glycine (gly) complex as the catalyst. Our findings demonstrate that the Co(II)-glycine-thiosulfate system exhibits excellent Au leaching performance coupled with low thiosulfate consumption. The effects of several parameters on Au leaching efficiencies and thiosulfate consumption were investigated. Increasing the concentrations of Co(II), thiosulfate, or glycine was beneficial to the Au leaching. However, increasing temperature promoted the oxidative decomposition of thiosulfate and reduced cobalt stability, negatively impacting Au leaching. Additionally, small amounts of base metals remained after pretreatment of WPCBs using HCl system and H2SO4-H2O2 system. Therefore, the roasting-assisted leaching process eliminated the adverse effects of these impurity metals and further improved Au leaching efficiency to 97.8% while also decreased thiosulfate consumption. The recovery of Au from the pregnant leach solution was also studied, and our findings demonstrated that N1923 can efficiently extract Au from the solution through anion exchange. Our study developed a novel and efficient Au thiosulfate leaching system catalyzed by the Co(gly)3/Co(S2O3)34- redox couple, and put forward a promising approach to enhance Au recyclability from WPCBs while significantly reducing thiosulfate consumption.