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首页> 外文期刊>Russian Journal of Physical Chemistry >Extraction of Cobalt and Lithium from Sulfate Solution Using Di(2-ethylhexyl)phosphoric Acid/Kerosene Mixed Extractant
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Extraction of Cobalt and Lithium from Sulfate Solution Using Di(2-ethylhexyl)phosphoric Acid/Kerosene Mixed Extractant

机译：使用二（2-乙基己基）磷酸/煤油混合萃取剂从硫酸盐溶液中提取钴和锂锂

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摘要

The solvent extraction behavior of cobalt and lithium from mixed sulfate solution using di(2-ethylhexyl)phosphoric acid (D2EHPA)/kerosene as extractant system has been investigated. The effect of different process parameters such as pH of feed solution, extractant concentration, cobalt and lithium ion concentrations in the feed solution have been studied. Extraction equilibrium constants have been calculated and found to be log K-ex Co = -2.01 and log K-ex Li = -2.42. The highest separation factor of 292 was achieved using 1.59 M D2EHPA at pH 1.85 from mixed sulfate solution. 93.9% of cobalt and 11.4% lithium was co-extracted from 0.01 M cobalt and lithium sulfate solution. Extraction of cobalt-lithium by D2EHPA is affected by cation exchange mechanism, cobalt is extracted as [Co(HA(2))(2)] and [CoA(2)] depending on the metal concentration in the feed solution while the lithium is extracted as [Li(A(2)H)]. Quantitative extraction of cobalt was achieved in two-stage counter-current batch extraction (with McCabe-Thiele plot) using 0.477 M D2EHPA at an O : A phase ratio of 1. The data obtained from loaded organic and raffinate indicate a composition which reveals nearly complete extraction of cobalt and rejection of lithium resulting significant separation of these elements from mixed sulfate solution.
机译：研究了使用二（2-乙基己基）磷酸（D2ehpa）/煤油作为萃取剂体系的混合硫酸盐溶液的溶剂提取行为。已经研究了进料溶液，提取物浓度，钴和锂离子浓度的不同工艺参数如饲料溶液中的效果。已经计算出提取平衡常数，发现是Log K-EXCO = -2.01和LOG K-EX LI = -2.42。使用来自混合硫酸盐溶液的pH 1.85的1.59m D2ehpa实现了最高分离因子292。从0.01M钴和硫酸锂溶液中共用93.9％的钴和11.4％的锂。通过D2ehPa提取钴 - 锂受阳离子交换机制的影响，钴根据锂锂中的饲料溶液中的金属浓度而提取为[CO（2））（2）]和[COA（2）]提取为[Li（a（2）h）]。在o的0.477 m d2ehpa的两级计量分批萃取（用mccabe-thiele图）中实现了钴的定量萃取：相比例为1.从装载的有机和萃余液中获得的数据表示几乎露出的组合物完全萃取钴和锂抗冲突，导致这些元素与混合硫酸盐溶液显着分离。

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