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Novel recovery of a low-concentration gold thiosulfate complex through electroreduction via a walnut shell charcoal electrode

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Green and Smart Mining Engineering 2024年第1期1卷 58-66页

作者： Qizheng Weng Shaoxian Song Weiquan Zhan Xuan Zhang Ziwei Xiang Jiabei Gao Feifei Jia Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources of Ministry of Education Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan University of TechnologyWuhan 430070China Instituto de Fisica Universidad Autonoma de San Luis PotosiAv.Manuel Nava 6Zona UniversitariaC.P.78290 San Luis PotosiS.L.P.Mexico

Low-concentration Au(S_(2)O_(3))2^(3-)recovery is an urgent issue to facilitate the application of thiosulfate leaching instead of cyanide leaching in ***,this work presents a novel recovery of low-concentration Au(S_(2)O_(3))2^(3-) combining adsorption and electrodeposition(electroreduction)to realize high Au(S_(2)O_(3))2^(3-)recovery in the form of gold particles(Au^(0)).walnut shells were used as the raw material for the successful preparation of charcoal with porous structure and rich oxygen-containing functional *** shell charcoal(WSC)as the electrode achieved efficient recovery of low-concentration Au(S_(2)O_(3))2^(3-).The recovery under low-concentration conditions was higher than 90%,with the highest reduction of 46.97 mg·g^(-1).Applying a suitable low voltage(0.8 V)facilitated lowconcentration Au(S_(2)O_(3))2^(3-)recovery,which was immensely improved than that without ***(S_(2)O_(3))2^(3-)recovery performances under applied voltage via the WSC electrode were related to electrochemical abilities,including reaction intensity and charge *** reactive sites containing suitable pores and oxygen functional groups were beneficial for the reduction *** work offers a new way to recover low-concentration Au(S_(2)O_(3))2^(3-)via cheap charcoal electrodes from solutions for application in the cyanide-free leaching method in industry.

关键词： Electroreduction Low concentration Au(S_(2)O_(3))2^(3-) Au^(0) walnut shell charcoal electrode

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