Solvent Extraction of Li and Co by using the Masking Effect of Chelating Agents

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  • Tanaka Satoshi
    Department of Chemical, Energy and Environmental Engineering, Faculty of Environmental and Urban Engineering, Kansai University
  • Mukuda Hiroyuki
    Department of Chemical, Energy and Environmental Engineering, Faculty of Environmental and Urban Engineering, Kansai University
  • Horai Kenichi
    Department of Chemical, Energy and Environmental Engineering, Faculty of Environmental and Urban Engineering, Kansai University
  • Murayama Norihiro
    Department of Chemical, Energy and Environmental Engineering, Faculty of Environmental and Urban Engineering, Kansai University
  • Shibata Junji
    Department of Chemical, Energy and Environmental Engineering, Faculty of Environmental and Urban Engineering, Kansai University
  • Saeki Tomonori
    Hitachi, Ltd., Yokohama Research Laboratory

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Other Title
  • キレート化剤のマスキング効果を用いた溶媒抽出によるLi<sup>+</sup>およびCo<sup>2+</sup>の抽出分離
  • キレート化剤のマスキング効果を用いた溶媒抽出によるLi⁺およびCo²⁺の抽出分離
  • キレートカザイ ノ マスキング コウカ オ モチイタ ヨウバイ チュウシュツ ニ ヨル Li ⁺ オヨビ Co ² ⁺ ノ チュウシュツ ブンリ

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The demand for critical materials such as Li and Co increases with the demand for lithium ion batteries. Since there are no natural sources of Li and Co in Japan, it is desirable to recover these critical materials from batteries. Though LiCoO2 is mainly used as the cathode material, it could be replaced by cheaper materials such as Li(Co1/3Ni1/3Mn1/3)O2, LiMn2O4 and LiFePO4. Recovery of these valuable metals from lithium ion batteries by hydrometallurgical processes involves complex treatments including leaching, precipitation, and solvent extraction, together with costly steps to remove less valuable metals such as Fe and Al.<br>In this study, the separation of Li+ and Co2+ from Li+/Fe3+/Al3+ and Co2+/Fe3+/Al3+ solutions was investigated with solvent extraction using the masking effect of chelating agents. On addition of chelating agents, it was found that Fe3+ and Al3+ formed water-soluble complexes, allowing Li+ and Co2+ to be selectively extracted in the organic layer. This effect depends on the stability of extractant-metal ion complexes and chelating agent-metal ion complexes. On addition of chelating agents, Fe3+ and Al3+ formed water-soluble complexes, allowing Li+ and Co2+ to be selectively extracted in the organic layer.

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