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A microextraction approach for rapid extraction and separation of Mn(II) and Co(II) using saponified D2EHPA system

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Abstract

In this paper, we proposed a microextraction approach for the extraction and separation of Mn(II) and Co(II) from sulfate solution simulating leachate of spent lithium-ion battery cathode materials using saponified di-(2-ethylhexyl)phosphoric acid system. The effects of the following operational variables were investigated: equilibrium pH, tri-n-butyl phosphate concentration, saponification rate, two-phase ratio and residence time. The results showcased that the microextractor can reach the extraction equilibrium within 20 s, thereby greatly reducing necessary extraction time comparing to that of conventional processes. The volumetric mass transfer coefficient showed 8–21 times larger than that of batch device. With the help of microextractor, 95% of Mn(II) was extracted with a single theoretical stage at a chosen two-phase ratio of 3:1, and the separation factor βMn/Co was as large as 65.5. In the subsequent stripping step, more than 99% of manganese from loaded phase was easily stripped under optimal conditions. The microextraction approach greatly enhances the mass transfer while enabling a continuous and controllable extraction process within a simple structure design. When extracting spent electrode material with microextractors, the comprehensive recovery of mangenese can reach 96%. The microextraction approach has a good applicability in the spent lithium-ion battery cathode materials recycling at both bench and industrial scales.

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Acknowledgements

The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (Grant Nos. 22025801 and 21636004) for this work.

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Authors and Affiliations

  1. The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China

    Yiwei Zhou, Chen Zhuo, Jinpei Huang, Haipeng Liu & Jianhong Xu

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  1. Yiwei Zhou
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  2. Chen Zhuo
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  3. Jinpei Huang
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  4. Haipeng Liu
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  5. Jianhong Xu
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Correspondence to Jianhong Xu.

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Zhou, Y., Zhuo, C., Huang, J. et al. A microextraction approach for rapid extraction and separation of Mn(II) and Co(II) using saponified D2EHPA system. Front. Chem. Sci. Eng. 16, 963–972 (2022). https://doi.org/10.1007/s11705-021-2081-7

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  • DOI: https://doi.org/10.1007/s11705-021-2081-7

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