P204-TBP协萃体系从高浓度硫酸钴溶液中萃取分离Mn和Ca  

Extraction and Separation of Mn and Ca from High Concentration Cobalt Sulfate Solution with P204-TBP Co-extraction System

作　　者：徐靖宸 肖超[1] 罗进爱 高立刚 XUJing-chen;XIAOChao;LUOJin-ai;GAOLi-gang(School of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004

出　　处：《有色金属（冶炼部分）》2021年第5期25-30,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51741403)。

摘　　要：针对从高浓度硫酸钴料液中分离钴锰相关研究较少的问题,采用P204与TBP形成的混合萃取体系从工业高浓度硫酸钴溶液中萃取分离Ca^(2+)、Co^(2+)、Mn^(2+),考察了萃取平衡pH、TBP体积分数、萃取相比、有机相皂化度对Ca^(2+)、Co^(2+)、Mn^(2+)萃取率的影响,并通过对有机相的洗涤来分离Ca^(2+)、Co^(2+)、Mn^(2+)。结果表明,以25%P204+10%TBP为萃取剂,65%煤油为稀释剂,在水相平衡pH为3.7,皂化率为45%和相比O/A为1∶2的条件下,Ca^(2+)、Co^(2+)及Mn^(2+)的萃取率分别为88.1%、69.8%和19.3%;再以30g/L硫酸锰溶液为洗涤液,在水相平衡pH为3.5、相比O/A为20∶1、洗涤级数为4的洗涤条件下,负载有机相中Mn^(2+)浓度为7.14g/L,Ca2和Co^(2+)浓度分别仅为0.05g/L和0.14g/L。该工艺有效实现了高浓度硫酸钴溶液中钴、锰、钙的分离。To address relatively few research issues related to separation of cobalt and manganese from high-concentration cobalt sulfate feed solution,process to extract and separate Ca^(2+),Co^(2+)and Mn^(2+)from industrial high-concentration cobalt sulfate solution with mixed extraction system formed by P204 and TBP was studied.Effects of extraction equilibrium pH value,volume fraction of TBP,extraction phase ratio,and degree of saponification of organic phase on extraction rate of Ca^(2+),Co^(2+)and Mn^(2+)were investigated.Ca^(2+),Co^(2+)and Mn^(2+)were separated via washing organic phase.The results show that extraction rate of Ca^(2+),Co^(2+)and Mn^(2+)is88.1%,69.8%and 19.3%,respectively under the conditions including 25%P204+10%TBP as extractant,65%kerosene as diluent,equilibrium pH value of water phase of 3.7,saponification rate of 45%,and O/A=1∶2.With 30g/L manganese sulfate solution as washing solution,and under washing conditions including equilibrium pH value of water phase of 3.5,O/A=20∶1,and washing series of 4,concentration of Mn^(2+)in loaded organic phase is 7.14g/L,concentration of Ca^(2+)and Co^(2+)is only 0.05g/L and 0.14g/L.This process effectively realizes separation of cobalt,manganese and calcium in high-concentration cobalt sulfate solution.

关 键 词：硫酸钴溶液 P204 TBP 萃取 分离 MN CA 

分 类 号：TF816[冶金工程—有色金属冶金] TF804.2