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首页> 外文期刊>RSC Advances >Extraction of cobalt(ii) by methyltrioctylammonium chloride in nickel(ii)-containing chloride solution from spent lithium ion batteries
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Extraction of cobalt(ii) by methyltrioctylammonium chloride in nickel(ii)-containing chloride solution from spent lithium ion batteries

机译：从废锂离子电池中用甲基三辛基氯化铵在含镍（ii）的氯化物溶液中萃取钴（ii）

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Spent lithium batteries contain valuable metals such as cobalt, copper, nickel, lithium, etc. After pretreatment and recovery of copper, only cobalt, nickel and lithium were left in the acid solution. Since the chemical properties of cobalt and nickel are similar, separation of cobalt from a solution containing nickel is technically challenging. In this study, Co( II ) was separated from Ni( II ) by chelating Co( II ) with chlorine ions, Co( II ) was then extracted from the aforementioned chelating complexes by methyltrioctylammonium chloride (MTOAC). The effects of concentrations of chlorine ions in the aqueous phase ([Cl ~(?) ] _(aq) ), MTOAC concentrations in organic phase ([MTOAC] _(org) ), ratios of organic phase to aqueous phase (O/A), and the initial aqueous pH on cobalt separation were studied. The results showed that [Cl ~(?) ] _(aq) had a significant impact on cobalt extraction efficiency with cobalt extraction efficiency increasing rapidly with the increase in [Cl ~(?) ] _(aq) . The effect of initial pH on cobalt extraction efficiency was not significant when it varied from 1 to 6. Under the condition of [Cl ~(?) ] _(aq) = 5.5 M, [MTOAC] _(org) = 1.3 M, O/A = 1.5, and pH = 1.0, cobalt extraction efficiency reached the maximum of 98.23%, and nickel loss rate was only 0.86%. The stripping rate of cobalt from Co( II )–MTOAC complexes using diluted hydrochloric acid was 99.95%. By XRD and XRF analysis, the recovered cobalt was in the form of cobalt chloride with the purity of cobalt produced reaching 97.7%. The mode of cobalt extraction was verified to be limited by chemical reaction and the kinetic equation for cobalt extraction was determined to be: R _((Co)) = 4.7 × 10 ~(?3) [MTOAC] _((org)) ~(1.85) [Co] _((aq)) ~(1.25) .
机译：废锂电池包含有价值的金属，例如钴，铜，镍，锂等。在对铜进行预处理和回收之后，酸性溶液中仅残留了钴，镍和锂。由于钴和镍的化学性质相似，因此从含镍溶液中分离钴在技术上具有挑战性。在这项研究中，通过与氯离子螯合Co（II）将Co（II）与Ni（II）分离，然后通过甲基三辛基氯化铵（MTOAC）从上述螯合配合物中提取Co（II）。水相中氯离子浓度（[Cl〜（？）] _（aq）），有机相中MTOAC浓度（[MTOAC] _（org）），有机相与水相之比（O / A），并研究了钴分离时的初始水溶液pH值。结果表明，[Cl〜（？）] _（aq）对钴的提取效率有显着影响，随着[Cl〜（？）] _（aq）的增加，钴的提取效率迅速提高。初始pH值从1变为6时，对钴提取效率的影响并不显着。在[Cl〜（？）] _（aq）= 5.5 M，[MTOAC] _（org）= 1.3 M的条件下， O / A = 1.5，pH = 1.0，钴提取效率最高，达到98.23％，镍损失率仅为0.86％。使用稀盐酸从Co（II）–MTOAC络合物中分离钴的率为99.95％。通过XRD和XRF分析，回收的钴为氯化钴形式，产生的钴纯度达到97.7％。验证了钴萃取的方式受到化学反应的限制，并且确定了钴萃取的动力学方程为：R _（（Co））= 4.7×10〜（？3）[MTOAC] _（（org）） 〜（1.85）[Co] _（（aq））〜（1.25）。

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