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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 the main impurity ions (Mg2 +, Ca2 +, Fe2 +, Fe3 +) in the leachate of microorganisms on the recovery of Cyanex272-P507, Cyanex272 and P507 extraction systems were studied respectively. Impact. It was found that the impurity ions had a significant effect on the cobalt extraction rate and the cobalt-nickel separation coefficient of the three extraction systems. Among them, Fe3 + had the strongest influence, while the impurity ions had little effect on the nickel extraction rate, which remained at a relatively low level. The extraction system of Cyanex272 is the most affected by impurity ions in three extraction systems. The addition of a small amount of impurity ions will significantly reduce the cobalt-nickel separation coefficient and the extraction rate of cobalt, while Cyanex272-P507 extraction system is contaminated by impurities Followed by ions, P507 extraction system is the least affected. At lower impurity ion concentrations, the Cyanex 272-P507 system achieves lower impurity ion extraction rates relative to the other two systems. When using Cyanex272-P507 extraction and extraction system to separate cobalt and nickel, in order to minimize the effect of impurity ions on cobalt extraction rate and cobalt-nickel separation coefficient, the maximum content of impurity ions Mg2 +, Ca2 +, Fe2 + and Fe3 + in the cobalt- Is: 90.0,21.0,52.0,8.8 mg · L-1.