Journal of Northeastern University(Natural Science)

Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (10): 1430-1436.DOI: 10.12068/j.issn.1005-3026.2019.10.012

• Materials & Metallurgy • Previous Articles     Next Articles

Extraction of Impurities from Leaching Solution of Cathode Active Material of Spent Lithium Ion Batteries by Sulfuric Acid

YI Ai-fei1, 2， ZHANG Jian1, 2， ZHU Zhao-wu1, 2， QI Tao 1, 2   

  1. 1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology， Institute of Process Engineering， Chinese Academy of Sciences， Beijing 100910， China; 2. Key Laboratory of Green Process and Engineering， Institute of Process Engineering， Chinese Academy of Sciences， Beijing 100910， China.
  • Received:2019-01-06 Revised:2019-01-06 Online:2019-10-15 Published:2019-10-10
  • Contact: ZHU Zhao-wu
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Abstract: The effect of the formulation by the acid phosphine extractants of P204 with Lix54 and of P507 with Lix84 on the Al extraction from sulfuric acid leaching solution of cathode active materials of spent lithium ion batteries was studied. The results indicate that the P507+Lix84 formulation has the best extraction and separation effect on Al/Mn. When the optimal formulation of 5%P507+5%Lix84/kerosene is used and V○a/V○ois 1∶1 with pH of 4.0， the single-staged extraction rate of Al， Cu， Co， Ni， Mn and Li is 89.1%， 80.8%， 3.4%， 2.6%， 3.2% and 0.3%， respectively. When V○a/V○o is 1∶4， the Al concentration is 0.88g·L-1in the mother liquid and the Al extraction rate is higher than 97.7% after the two-staged(theoretical-level)extraction. With 2.0mol/L sulfuric acid solution in the oil phase and V○a/V○o of 10∶1， the Al concentration is 0.79g·L-1and the Al stripping rate is higher than 99.0% after the two-staged(theoretical-level)stripping process.

Key words: ternary lithium battery, P204, P507, Lix54, Lix84, solvent extraction, removing Al

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