酸性条件下镍电解液净化除铜实验研究  

Study on Copper Removal from Nickel Electrolyte Under Acidic Condition

作　　者：班双 蒋晓云 易亚男 周剑雄 BAN Shuang;JIANG Xiao-yun;YI Ya-nan;ZHOU Jian-xiong

机构地区：[1]长沙华时捷环保科技发展股份有限公司,湖南长沙410013

出　　处：《有色设备》2021年第5期25-28,共4页Nonferrous Metallurgical Equipment

摘　　要：本文对镍电解液硫化除铜工艺条件实验考察,实验结果表明:溶液反应pH值和反应终点氧化还原电位(ORP)值,以及硫化反应级数属于镍电解液采用硫化氢铜镍分离的关键影响因素。其中ORP值决定了硫化除铜效率以及沉铜渣中镍损失的高低;反应溶液pH太低或太高都不利于除铜;采用两级硫化的实验,硫化渣中铜镍比数据优于单级硫化。反应温度60~70℃、H2S实际投加量为1.2~1.5倍理论需求量、一级硫化反应终点溶液ORP控制在110~180 mV、二级硫化反应终点溶液ORP控制在-(115~120)mV时,硫化除铜后液Cu离子浓度可以达到1 mg/L以下,硫化渣中铜镍比稳定在15以上,证明了工艺技术的可行性。In this paper,the technological conditions of copper removal by sulfidization from nickel electrolyte are experimented and studied.The results show that the pH value of solution reaction,the oxidation reduction potential(ORP)value at reaction end point and the stages of sulfidization reaction are the key factors affecting the separation of copper and nickel in nickel electrolyte with hydrogen sulfide.The ORP value among them determines the copper removal efficiency and nickel loss in copper precipitate the reaction solution at low or high PH value is not favorable for copper removal;the Cu/Ni ratio of the precipitate obtained from two-stage sulfidization is better than that of single-stage.Under the controlled conditions of reaction temperature 60~70℃,the actual dosage of H_(2)S 1.2~1.5 times of the theoretical demand,the product solution ORP at the reaction end points of the first and second stage sulfidization reaction 110~180 mV and-(115~120)mV respectively,the concentration of Cu ion in the solution after sulfidization can drop to less than 1 mg/L,and the Cu/Ni ratio in the sulfidization precipitate is maintained above 15,proving the feasibility of the technology.

关 键 词：镍电解液 硫化氢 净化除铜 

分 类 号：TF815[冶金工程—有色金属冶金]