Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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A Study on Recovery of Rare Earth and Acid Leaching for Wet Recycling of Waste NiMH Batteries

니켈수소 폐이차전지의 습식 재활용을 위한 산침출 및 희토류 회수에 대한 연구

  • Ahn, Nak-Kyoon (Advanced Materials and Processing Center, Institute for Advanced Engineering(IAE)) ;
  • Kim, Dae-Weon (Advanced Materials and Processing Center, Institute for Advanced Engineering(IAE)) ;
  • Yang, Dae-Hoon (GM-Tech)
  • Received : 2017.10.25
  • Accepted : 2018.01.16
  • Published : 2018.02.28
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Abstract

In order to industrially recycle nickel, cobalt and rare earth elements included in waste NiMH batteries, electrode powder scraps were recovered by dismantle, crushing and classification from automobile waste battery module. As a result of leaching recovered electrode powder scrap with sulfuric acid solution, 99% of nickel, cobalt and rare earth elements were leached under reaction conditions of 1.0 M sulfuric acid solution, pulp density 25 g/L and reaction temperature $90^{\circ}C$ for 4 hours. In addition, the rare earth elements were able to separate from nickel / cobalt solution as cerium, lanthanum and neodymium precipitated under pH 2.0 using 10 M NaOH.

폐니켈수소전지에 함유되어 있는 유가금속인 니켈, 코발트 그리고 희토류의 산업적 재활용을 위하여 자동차용 폐전지모듈로부터 분해, 분쇄 및 분급을 통하여 전극 분말을 회수하였다. 회수된 전극 분말 스크랩을 황산용액으로 침출한 결과 황산농도 1.0 M, 고액비 25 g/L, 반응 온도 $90^{\circ}C$, 4시간 동안의 반응조건에서 니켈, 코발트 그리고 희토류는 약 99%의 침출결과를 얻었으며, 침출액으로부터 희토류는 10 M NaOH를 이용하여 pH 2.0 이하에서 희토류 침전물과 니켈/코발트 용액 분리가 가능하였다.

Keywords

References

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  1. 폐니켈수소전지에서 회수된 희토류복합 침전분말로부터 세륨 회수에 대한 연구 vol.28, pp.6, 2018, https://doi.org/10.7844/kirr.2019.28.6.18