Cextrant 230从低品位铜矿H_(2)SO_(4)-NaCl浸出液中选择性提取回收铜  

Selective Extraction and Recovery of Copper from the Leaching of Low-grade Copper Ore by H_(2)SO_(4)-NaCl Solution Using Cextrant 230

作　　者：方愈 况王强 邝圣庭 廖伍平 FANG Yu;KUANG Wang-Qiang;KUANG Sheng-Ting;LIAO Wu-Ping(School of Chemistry and Chemical Engineering,Nanchang University,Nanchang 330031,China;Institute of Material and Chemistry,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China;State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)

机构地区：[1]南昌大学化学化工学院,南昌330031 [2]中国科学院赣江创新研究院,材料与化学研究所,赣州341000 [3]中国科学院长春应用化学研究所,稀土资源利用国家重点实验室,长春130022

出　　处：《应用化学》2023年第5期758-768,共11页Chinese Journal of Applied Chemistry

基　　金：中国科学院赣江创新研究院自主部署项目(No.E055C002);江西省自然科学基金青年基金项目(No.20212BAB213033);江西省“双千计划”(No.Jxsq.2020101005)资助。

摘　　要：助浸剂NaCl可提高硫酸在常温常压下浸取低品位复杂铜矿时铜的浸出率,但也形成了含铜的混酸溶液。二(2-乙基己基)-(N-(2-乙基己基)氨基)甲基膦酸酯(Cextrant230)对混酸(H_(2)SO_(4)+HCl)溶液中Cu^(2+)、Fe^(3+)、Co^(2+)、Mg^(2+)和Al^(3+)的萃取行为进行了研究。结果表明,Cextrant 230对混酸溶液中的Cu^(2+)和Fe^(3+)具有良好的萃取能力和选择性,而对Co^(2+)、Mg^(2+)和Al^(3+)的萃取能力较弱;Cl-可促进Cu^(2+)的萃取,而SO_(4)^(2-)和HSO_(4)^(-)对Cu^(2+)的萃取起抑制作用;Cu^(2+)的萃取过程是放热反应;当水相初始pH值为1.16,ρ(Cl-)为20g/L时,c(Cextrant230)=0.60mol/L对Cu^(2+)的饱和负载容量为13.1g/L;负载有机相中的Cu^(2+)可用H_(2)SO_(4)完全反萃;经2级逆流萃取优先除Fe^(3+),混酸模拟液中的ρ(Fe^(3+))从0.65g/L减少至32mg/L,Cu^(2+)的共萃取率仅1.5%;再经4级萃取,1级洗涤,3级反萃,可获得纯度大于99.7%的Cu2(OH)2CO3产品,铜收率为98.5%。The aid-leaching reagent NaCl can improve the leaching efficiency of copper from low-grade complex copper ore at ambient temperature and pressure,which gives a leach solution containing mixed acids.The extraction of Cu^(2+),Fe^(3+),Co^(2+),Mg^(2+)and Al^(3+)from the mixed H_(2)SO_(4)-HCl solutions using di(2-ethylhexyl)[N-(2-ethylhexyl)amino methyl]phosphonate(Cextrant 230)is studied here.Cextrant 230 has better extraction ability and selectivity towards Cu^(2+)and Fe^(3+)than Co^(2+),Mg^(2+)and Al^(3+)in the mixed acid solutions.The extraction of Cu^(2+)can be facilitated by Cl-while it is restrained by SO_(4)^(2-)and HSO_(4)^(-).The extraction reaction of Cu^(2+)is an exothermic process.The loading capacity of 0.60 mol/L Cextrant 230 for Cu^(2+)is determined to be 13.1 g/L at an initial pH of 1.16 with 20 g/L Cl-.The loaded Cu(Ⅱ)can be stripped completely by H_(2)SO_(4).By 2 stages of extraction,the content of iron in the mixed acid solution is decreased from 0.65 g/L to 32 mg/L and only 1.5%copper is co-extracted.After iron removal,the copper product with the purity of 99.7%and the yield of 98.5%can be obtained by 4 stages of extraction,1 stage of scrubbing and 3 stages of stripping.

关 键 词：铜 Cextrant 230 混酸溶液 溶剂萃取 回收 

分 类 号：O658.2[理学—分析化学]