자원리싸이클링 (Resources Recycling)

  • 제28권5호
  • /
  • Pages.51-59
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  • 2019
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  • 2765-3439(pISSN)
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  • 2765-3447(eISSN)
한국자원리싸이클링학회 (The Korean Institute of Resources Recycling)
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DOI QR Code

폐니켈-카드뮴 전지로부터 황산암모늄을 이용한 수산화니켈 제조 방안 연구

A study on the Synthesis of Nickel Hydroxide by Ammonium Sulfate from Waste Nickel-Cadmium Batteries

  • 김민준 (고등기술연구원 신소재공정센터) ;
  • 박일정 (고등기술연구원 신소재공정센터) ;
  • 김대원 (고등기술연구원 신소재공정센터) ;
  • 정항철 (고등기술연구원 신소재공정센터)
  • Kim, Min-Jun (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Park, Il-Jeong (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Kim, Dae-Weon (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Jeong, Hang-Chul (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
  • 투고 : 2019.08.09
  • 심사 : 2019.09.10
  • 발행 : 2019.10.31
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초록

폐니켈-카드뮴전지 내의 니켈과 카드뮴을 분리하기 위한 재활용 기술 중 황산암모늄($(NH_4)_2SO_4$)을 이용하여 니켈을 침전시킴으로써 분리하는 기술이 보고되고 있어, 실제 산업현장에서 사용 중인 침출액을 이용하여 pH, 온도, 황산암모늄의 투입량 등을 변수로 하여 최적의 니켈 회수 조건을 도출하였다. pH의 경우 중성, 염기성에 비해 산성의 침출액에 황산암모늄을 투입했을 때 안정적인 황산니켈암모늄($(NH_4)_2Ni(SO_4)_26H_2O$)이 형성되었으며, 침출액의 온도는 $60^{\circ}C$일 때 가장 높은 순도를 나타내었다. 황산암모늄의 투입량은 니켈 함량 대비 2배의 몰 비로 투입했을 때 높은 회수율과 가장 적은 불순물 함량을 나타내었다. 서로 다른 두 공정을 통한 수산화니켈 제조 결과, 황산니켈암모늄 이용 시 카드뮴이 1.4% 검출되었고 황화나트륨($Na_2S$)을 이용하여 카드뮴을 제거한 용액에서 수산화니켈 제조 시에는 침출액 내 포함되어 있던 철과 니켈이 동시에 석출되었다. 본 연구를 통해 황산암모늄을 이용한 니켈 회수가 유용한 재활용 기술이 될 수 있을 것으로 사료된다.

This study focused on the synthesis of the nickel hydroxide using ammonium sulfate in leaching solution from waste nickel-cadmium batteries. The effect of pH, temperature and the input amount of ammonium sulfate in leaching solution was investigated. The ammonium nickel sulfate with high purity was obtained in acidic leaching solution and the solution temperature of $60^{\circ}C$. The suitable molar ratio of the input amount of ammonium sulfate to nickel in solution is 2:1. The impurity about 1.4 at.% of Cd was included in the nickel hydroxide precipitates when ammonium nickel sulfate was used. At the process using sodium sulfide which precipitates the cadmium in solution, nickel and iron compounds were precipitated together.

키워드

참고문헌

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