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A Modified Process for the Separation of Fe(III) and Cu(II) from the Sulfuric Acid Leaching Solution of Metallic Alloys of Reduction Smelted Spent Lithium-ion Batteries

폐리튬이온전지의 용융환원된 금속합금상의 황산침출액에서 철(III)과 구리(II)의 분리를 위한 공정 개선

  • Nguyen, Thi Thu Huong (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National UnIIiversity) ;
  • Tran, Thanh Tuan (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National UnIIiversity) ;
  • Lee, Man Seung (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National UnIIiversity)
  • ;
  • ;
  • 이만승 (목포대학교 공과대학 신소재공학과)
  • Received : 2021.11.15
  • Accepted : 2021.11.26
  • Published : 2022.02.28

Abstract

The smelting reduction of spent lithium-ion batteries results in metallic alloys containing Co, Cu, Fe, Mn, Ni, and Si. A process to separate metal ions from the sulfuric acid leaching solution of these metallic alloys has been reported. In this process, ionic liquids are employed to separate Fe(III) and Cu(II). In this study, D2EHPA and Cyanex 301 were employed to replace these ionic liquids. Fe(III) and Cu(II) from the sulfate solution were sequentially extracted using 0.5 M D2EHPA with three stages of cross-current and 0.3 M Cyanex 301. The stripping of Fe(III) and Cu(II) from the loaded phases was performed using 50% (v/v) and 60% (v/v) aqua regia solutions, respectively. The mass balance results from this process indicated that the recovery and purity percentages of the metals were greater than 99%.

폐리튬이온전지를 용융환원시키면 구리, 코발트, 철, 망간, 니켈 및 규소를 함유한 금속합금을 얻는다. 금속합금의 황산침출용액에서 상기 금속을 분리하기 위한 공정을 개발하여 발표하였다. 이 공정에서는 철(III)과 구리(II)를 분리하기 위해 이온성액체를 사용하였다. 본 연구에서는 이온성액체를 대체하기 위해 D2EHPA와 Cyanex 301을 추출제로 사용했다. 철(III)과 구리(II)는 황산침출액으로부터 0.5 M의 D2EHPA에 의한 3단의 교차추출 및 0.3 M의 Cyanex 301로 분리하는 것이 가능했다. 유기상으로부터 철(III)과 구리(II)의 탈거는 각각 50%와 60%의 왕수로 가능했다. 연속실험의 물질수지로부터 금속의 회수율과 순도는 99%이상으로 확인되었다.

Keywords

Acknowledgement

This work was supported by the Technology Innovation Program (Development of Material Component Technology) (Project number: 20011183) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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