Separation and recovery of Ni from copper electrolyte by crystallization of nickel ammonium sulfate double salt  

硫酸镍铵复盐结晶法分离回收铜电解液中的镍

作　　者：Yi WANG Biao LIU Xue-wen WANG Yu-qi MENG Xing-ming WANG Ming-yu WANG 王懿;刘彪;王学文;孟钰麒;王兴明;王明玉(中南大学冶金与环境学院,长沙410083;中南大学资源加工与生物工程学院,长沙410083)

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第11期3780-3789,共10页中国有色金属学报（英文版）

基　　金：the National Natural Science Foundation of China(No.50274075).

摘　　要：The separation and recovery of Ni from the copper electrolyte by crystallization of nickel ammonium sulfate double salt were studied.It is found that the solubility of copper sulfate at the same temperature is less than that of nickel sulfate,while the solubility of copper ammonium sulfate is greater than that of nickel ammonium sulfate.So,by adding(NH_(4))_(2)SO_(4),the Ni can be selectively crystallized from the copper electrolyte.By adding(NH_(4))_(2)SO_(4)at the molar ratio of(NH_(4))_(2)SO_(4)/NiSO_(4)≤0.8,and crystallizing at−15℃for 10 h,the Ni in the copper electrolyte can be crystallized in the form of Ni(NH_(4))_(2)(SO_(4))_(2)×6H_(2)O.The qualified product of NiSO_(4)×6H_(2)O can be obtained by pyrolyzing the crystals,dissolving the pyrolysis product in water,and then concentrating the dissolved solution for crystallization.The method of double salt crystallization is a clean,environmentally-friendly,cost-effective and efficient method for separating and recovering nickel from copper electrolyte.研究采用硫酸镍铵复盐结晶从铜电解液中分离回收镍的方法。研究发现,在相同温度的溶液中,硫酸铜的溶解度小于硫酸镍的溶解度,而硫酸铜铵的溶解度大于硫酸镍铵的溶解度。因此,加入(NH_(4))_(2)SO_(4)可使铜电解液中的镍选择性结晶析出。按(NH_(4))_(2)SO_(4)/NiSO_(4)摩尔比≤0.8加入(NH_(4))_(2)SO_(4),在−15℃冷冻结晶10 h,可使其中的镍以Ni(NH_(4))_(2)(SO_(4))_(2)×6H_(2)O的形式结晶析出。将所得结晶物热解,再将热解产物加水溶解,最后将溶解液浓缩结晶得到合格的NiSO_(4)×6H_(2)O产品。复盐结晶法是一种清洁环保、经济高效的从铜电解液中分离回收镍的方法。

关 键 词：copper electrolyte NICKEL CRYSTALLIZATION nickel ammonium sulfate 

分 类 号：TF815[冶金工程—有色金属冶金]