Yingnan Yang, Yingjie Yang, Chunlin He, Yuezhou Wei, Toyohisa Fujita, Guifang Wang, Shaojian Ma, and Wenchao Yang, Solvent extraction and separation of cobalt from leachate of spent lithium-ion battery cathodes with N263 in nitrite media, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 897-907. https://doi.org/10.1007/s12613-022-2571-8
Cite this article as:
Yingnan Yang, Yingjie Yang, Chunlin He, Yuezhou Wei, Toyohisa Fujita, Guifang Wang, Shaojian Ma, and Wenchao Yang, Solvent extraction and separation of cobalt from leachate of spent lithium-ion battery cathodes with N263 in nitrite media, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 897-907. https://doi.org/10.1007/s12613-022-2571-8
Research Article

Solvent extraction and separation of cobalt from leachate of spent lithium-ion battery cathodes with N263 in nitrite media

+ Author Affiliations
  • Corresponding author:

    Chunlin He    E-mail: helink1900@126.com

  • Received: 10 August 2022Revised: 3 November 2022Accepted: 4 November 2022Available online: 8 November 2022
  • To effectively separate and recover Co(II) from the leachate of spent lithium-ion battery cathodes, we investigated solvent extraction with quaternary ammonium salt N263 in the sodium nitrite system. N${\rm{O}}_2^- $ combines with Co(II) to form an anion [Co(NO2)3], and it is then extracted by N263. The extraction of Co(II) is related to the concentration of N${\rm{O}}_2^- $. The extraction efficiency of Co(II) reaches the maximum of 99.16%, while the extraction efficiencies of Ni(II), Mn(II), and Li(I) are 9.27%‒9.80% under the following conditions: 30vol% of N263 and 15vol% of iso-propyl alcohol in sulfonated kerosene, the volume ratio of the aqueous-to-organic phase is 2:1, the extraction time is 30 min, and 1 M sodium nitrite in 0.1 M HNO3. The theoretical stages require for the Co(II) extraction are performed in the McCabe–Thiele diagram, and the extraction efficiency of Co(II) reaches more than 99.00% after three-stage counter-current extraction with Co(II) concentration of 2544 mg/L. When the HCl concentration is 1.5 M, the volume ratio of the aqueous-to-organic phase is 1:1, the back-extraction efficiency of Co(II) achieves 91.41%. After five extraction and back-extraction cycles, the Co(II) extraction efficiency can still reach 93.89%. The Co(II) extraction efficiency in the actual leaching solution reaches 100%.
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