有色金属科学与工程2024，Vol.15Issue(3)：322-331,10.DOI:10.13264/j.cnki.ysjskx.2024.03.002
锌电积体系Zn-MnO2同槽电解电化学分析
Electrochemical analysis of the simultaneous electrolysis of zinc and manganese dioxide in zinc electrowinning system
摘要
Abstract
In this work,the electrochemical process of the simultaneous electrolysis of zinc and manganese dioxide was systematically analyzed based on cyclic voltammetry,linear voltammetry,and electrochemical impedance spectroscopy,combined with electrolytic experiments.The results show that the reduction of Zn2+and the oxidation of Mn2+in the system do not interfere with each other within a Mn2+concentration lower than 10 g/L.Increasing the concentration of Mn2+is beneficial for electrolysis in the same cell.However,if the concentration of Mn2+is too high,it will increase the generation of oxidizing MnO4-,leading to the dissolution of cathode Zn by chemical oxidation;The electro-oxidation process of Mn2+is affected by the passivation of the electrode interface.Increasing the concentration of Mn2+is favorable to the same groove electrolysis.However,an over-high concentration of Mn2+will increase the production of oxidative MnO4-,resulting in the dissolution of the cathode Zn by the chemical oxidation.In addition,increasing the deposition temperature can improve the same groove electrolysis performance of Zn-MnO2,but an excessively high temperature(≥80℃)will accelerate the corrosion of Zn.The optimal conditions of same groove electrolysis of Zn and MnO2 are as follows:Mn2+concentration is 10 g/L,with a cathode current density of 40 mA/cm2 and an anode current density of 10 mA/cm2,respectively,at a temperature of 60℃.In the optimal conditions,cathode and anode current efficiencies are 94.81%and 12.16%,respectively.The energy consumption per ton of zinc is 2 456.58 kW·h,and the anodic product is ε-MnO2.关键词
锌电积/二氧化锰电解/同槽电解/阳极钝化/电流效率/高效电解Key words
zinc electrowinning/manganese dioxide electrolysis/simultaneous electrolysis/anodic passivation/current efficiency/efficient electrolysis分类
矿业与冶金引用本文复制引用
裴启飞,郭孟伟,邵伟春,王恩泽,高明远,张启波..锌电积体系Zn-MnO2同槽电解电化学分析[J].有色金属科学与工程,2024,15(3):322-331,10.基金项目
国家自然科学基金资助项目(21962008) （21962008）
