Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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A Study on the Electrochemical Kinetics of Electrowinning Process of Valuable Metals Recovered from Lithium-ion Batteries

폐리튬이온전지로부터 유가금속 회수를 위한 전해채취 공정 전기화학 반응속도론적 연구

  • Park, Sung Cheol (Korea Institute of Industrial Technology) ;
  • Kim, Yong Hwan (Korea Institute of Industrial Technology) ;
  • Lee, Man Seung (Department of Advanced Materials Science and Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Son, Seong Ho (Korea Institute of Industrial Technology)
  • 박성철 (한국생산기술연구원 뿌리산업기술연구소) ;
  • 김용환 (한국생산기술연구원 뿌리산업기술연구소) ;
  • 이만승 (목포대학교 신소재공학과) ;
  • 손성호 (한국생산기술연구원 뿌리산업기술연구소)
  • Received : 2022.09.29
  • Accepted : 2022.10.13
  • Published : 2022.10.31
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Abstract

To investigate the rate-determining step of nickel, cobalt and copper electrowinning, experiments were conducted by varying the electrolyte temperature and agitation speed using a rotating disc electrode. Analyzing the rate-determining step by calculating the activation energy in the electrowinning process, it was found that nickel electrowinning is controlled by a mixed mechanism (partly by chemical reaction and partly by mass transport), cobalt is controlled by chemical reaction, and copper is controlled by mass transfer. Electrowinning of nickel, cobalt and copper was performed by varying the electrolyte temperature and agitation speed, and the comparison of the current efficiencies was used the determine the rate-determining step.

니켈, 코발트 및 구리 전해채취의 반응율속단계 규명을 위해 회전원판전극(rotating disc electrode, RDE)를 사용하여 전해액 온도 및 교반속도에 대한 실험을 수행하였다. 유가금속 별 전해채취 공정에서의 활성화에너지를 구하여 반응율속단계를 규명한 결과 니켈은 혼합율속, 코발트는 화학반응율속, 구리는 물질전달율속으로 판단되었다. 니켈, 코발트 및 구리의 전해액 온도 및 교반속도 변화에 따른 전해채취 공정을 수행하여 전류효율을 비교한 결과 반응율속단계 결과와 일치하였다.

Keywords

Acknowledgement

본 연구는 2020년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원(과제번호 : 20011183)에 의한 연구 결과로서 이에 감사드립니다.

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