Chlorine inclusion mechanism in high purity copper electrorefining from nitric acid system

作     者：Hua-zhen CAO Wen-yu FENG Hui-bin ZHANG Guo-qu ZHENG 曹华珍;冯闻宇;张惠斌;郑国渠

作者机构：College of Materials Science and EngineeringZhejiang University of TechnologyHangzhou 310014China 

基　　金：Project(LY17B030009)supported by the Natural Science Foundation of Zhejiang Province China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2020年第30卷第5期

页      码：1387-1396页

摘      要：A practical approach was introduced to study the inclusion mechanism of chlorine in high purity copper electrorefining from nitric acid system via cyclic voltammetry(CV) combined with electrodeposition experiments. The CV curves display an obvious reduction peak of Cu Cl intermediate, which can provide an insight into the electrochemical behavior of this inclusion. Experimental results show that the increase of HNO3 concentration is favorable to reducing the quantity of chlorine inclusion although there is a slight decline in cathodic current efficiency. The optimum conditions for copper electrorefining in nitric acid system are HNO3 concentration in solution of 1-2 mol/L, moderate temperature of ~35 ℃ with current density not exceeding 25 m A/cm2. Based on the theoretical studies, an optimized copper electrorefining experiment was designed to simulate the industrial electrolysis, by which high purity copper can be obtained with chlorine inclusion less than 10 μg/g and current efficiency higher than 90%.

主 题 词：copper electrorefining nitric acid system cuprous chlorine inclusion mechanism 

学科分类：080603[080603] 0806[工学-电气类] 08[工学] 0818[工学-交通运输类] 0815[工学-矿业类] 0805[工学-能源动力学] 0813[工学-化工与制药类] 0703[理学-化学类] 0814[工学-地质类] 0702[理学-物理学类] 

核心收录：

D　O　I：10.1016/S1003-6326(20)65304-3

馆 藏 号：203930055...