杂质离子对不同萃取体系下镍钴分离的影响研究  

Separation of Nickel and Cobalt in Different Solvent Extraction Systems with Impurity Metal Ions

作　　者：管青军 周桂英[1] 温建康[1] 

机构地区：[1]北京有色金属研究总院生物冶金国家工程实验室,北京100088

出　　处：《稀有金属》2015年第3期235-243,共9页Chinese Journal of Rare Metals

基　　金：国家科技部重点基础研究发展计划("973"计划)基金项目(2010CB630906);国家科技部高技术研究发展计划("863"计划)基金项目(2012AA060502)资助

摘　　要：分别考察了微生物浸出液中主要杂质离子(Mg2+,Ca2+,Fe2+,Fe3+)对Cyanex272-P507协萃体系、Cyanex272萃取体系和P507萃取体系在低p H值条件下分离回收模拟微生物浸出液中低含量钴镍的影响。研究发现杂质离子对3种萃取体系的钴萃取率和钴镍分离系数均有较大影响,其中Fe3+的影响最大,而杂质离子对镍萃取率影响不大,其仍保持在较低水平。3个萃取体系中Cyanex272萃取体系是受杂质离子影响最严重的萃取体系,少量杂质离子的增加就会使其钴镍分离系数以及钴萃取率发生显著的下降,而Cyanex272-P507协萃体系受杂质离子影响次之,P507萃取体系受影响最小。在杂质离子浓度较低时,相对于其他两个体系,Cyanex272-P507协萃体系可以实现更低的杂质离子萃取率。运用Cyanex272-P507协萃体系萃取分离钴镍时,为尽量降低杂质离子对钴萃取率和钴镍分离系数的影响,钴镍料液中所含杂质离子Mg2+,Ca2+,Fe2+,Fe3+的最高含量分别是:90.0,21.0,52.0,8.8 mg·L-1。The effects of main impurity ions （ Mg2 ＋ , Ca2 ＋ , Fe2＋ , Fe3 ＋） on the separation of low-grade nickel and cobalt from simu- lated bio-leaching solution in different solvent extraction systems under low initial pH value were studied. The solvent extraction systems were Cyanex272-PS07 system, Cyanex272 system and P507 system. The study showed that the impurity ions, especially Fe3 ＋ , had a marked impact on cobalt extraction rate and the separation factor of cobalt over nickel of the three systems; however, the impact on nickel extraction rate was not significant. The most severely affected system of the three solvent extraction systems was Cyanex272 sys- tem, and a small increase of the amount of impurity ions could make the separation factor of cobalt over nickel and cobalt extraction rate drop sharply. Cyanex272-PS07 system was influenced less seriously and P507 system was minimally affected. When the concentration of impurity ions was low, Cyanex272-PS07 system could achieve lower extraction rates of impurity ions compared with the other two sys- tems. In order to reduce the effects of the impurity ions on cobalt extraction rate and the separation factor of cobalt over nickel of Cya- nex272-PS07 system, the upper limits of Mg2＋ , Ca2 ＋ , Fe2 ＋ and Fe3 ＋ in nickel and cobalt solution should be 90.0, 21.0, 52.0 and 8.8 mg.L-1 , respectively.

关 键 词：杂质离子 协同萃取 CYANEX272 P507 钴镍分离 

分 类 号：TF18[冶金工程—冶金物理化学]