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

作　　者：Qizheng Weng Shaoxian Song Weiquan Zhan Xuan Zhang Ziwei Xiang Jiabei Gao Feifei Jia 

机构地区：[1]Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources of Ministry of Education,Wuhan University of Technology,Wuhan 430070,China [2]Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan University of Technology,Wuhan 430070,China [3]Instituto de Fisica,Universidad Autonoma de San Luis Potosi,Av.Manuel Nava 6,Zona Universitaria,C.P.78290 San Luis Potosi,S.L.P.,Mexico

出　　处：《Green and Smart Mining Engineering》2024年第1期58-66,共9页绿色与智能矿业工程（英文）

基　　金：supported by the National Key Research and Development Program of China (No.2021YFC2900900)。

摘　　要：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 factories.Herein,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 groups.Walnut 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 voltage.Au(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 transfer.More reactive sites containing suitable pores and oxygen functional groups were beneficial for the reduction reaction.This 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 

分 类 号：TD955[矿业工程—选矿] TD923