자원리싸이클링 (Resources Recycling)

  • 제25권2호
  • /
  • Pages.33-41
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  • 2016
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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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용매추출-전해채취법에 의한 망간단괴 매트상 모의 침출용액으로부터 코발트 회수

Recovery of Cobalt from Synthetic Leaching Solution of Manganese Nodule Matte by Solvent Extraction-electrowinning

  • 김현호 (한국지질자원연구원, 제련연구실) ;
  • 남철우 (한국지질자원연구원, 제련연구실) ;
  • 박경호 (한국지질자원연구원, 제련연구실) ;
  • 윤호성 (한국지질자원연구원, 제련연구실) ;
  • 김민석 (한국지질자원연구원, 제련연구실) ;
  • 김철주 (한국지질자원연구원, 제련연구실) ;
  • 박상운 (한국지질자원연구원, 제련연구실)
  • Kim, Hyun-Ho (Extractive metallurgy department, Korea Institute of Geoscience and Mineral Resources) ;
  • Nam, Chul-Woo (Extractive metallurgy department, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Kyung-Ho (Extractive metallurgy department, Korea Institute of Geoscience and Mineral Resources) ;
  • Yoon, Ho-Sung (Extractive metallurgy department, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Min-Seuk (Extractive metallurgy department, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Chul-Joo (Extractive metallurgy department, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Sang-Woon (Extractive metallurgy department, Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2016.02.26
  • 심사 : 2016.04.07
  • 발행 : 2016.04.30
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초록

망간단괴 매트상 모의 침출용액에서 구리 용매추출과 수산화 침전법에 의해 구리와 철이 제거 된 용액(Co 1.91 g/L, Ni 14.65 g/L)으로부터 용매추출-전해채취 연속공정을 통해 코발트를 분리, 회수를 위한 규모확대 실험(망간단괴 기준 380 kg/day)을 수행하였다. 용매추출의 경우 추출제로는 NaOH로 45% 비누화 된 0.22 M Cyanex 272, 세정용액은 코발트 2 g/L(pH : 3.0), 탈거용액은 코발트 전해폐액(Co 36.0 g/L, $Na_2SO_4\;70g/L$, pH : 1.5)을 사용하였으며, 탈거된 유기상은 산과 증류수의 세척 공정을 통해 재사용하였다. 추출단, 세정단 그리고 탈거단의 O/A 비는 각각 1/1.5, 10/1 그리고 1.5/1 이었으며, 산세척과 수세척단의 O/A 비는 각각 1/1, 6/1이었다. 용매추출공정의 코발트의 추출율과 탈거율은 각각 99.8%와 99.88%이었으며 탈거액의 코발트와 니켈의 농도는 각각 40.27 g/L, 4 ppm이었다. 전해액의 pH 조절을 위해 전해폐액 순환 방식을 도입한 전해채취공정은 $0.563A/dm^2$의 전류밀도에서 67.0%의 전류효율을 나타내었으며, 99.963% 순도의 금속 코발트를 얻었다.

A scale up tests (380 kg/day) using a continuous solvent extraction and electro-winning system was carried out to separate and recover cobalt from a solution containing 1.91 g/L Co and 14.65 g/L Ni. The solution was obtained during a process including solvent extraction and precipitation stages for removal of Cu and Fe from a synthetic sulfuric acid solution of manganese nodule matte. The optimal condition for solvent extraction was : solvent concentration of 0.22M Na-Cyanex 272 (45% saponified with NaOH) and O:A phase ratios of 1:1.5, 10:1 and 1.5:1 used in extraction, scrubbing and stripping stages, respectively. The extraction and stripping efficiencies were found to be 99.8% and 99.88%, respectively. The stripped solution contained 40.27 g/L Co with 4 ppm Ni. Cobalt metal of 99.963% purity was yielded with current efficiency of 67% and current density of $0.563A/dm^2$ during the electro-winning process.

키워드

참고문헌

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