Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Behavior of Cobalt Extraction from Cobalt Sulphate solution using Supercritical 2

황산코발트용액(溶液)으로부터 초임계(超臨界CO2에 의한 코발트 추출거동(抽出擧動)

  • Shin, Shun-Myung (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Joo, Sung-Ho (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Sohn, Jeong-Soo (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Kang, Jin-Gu (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
  • 신선명 (한국지질자원연구원 광물자원연구본부) ;
  • 주성호 (한국지질자원연구원 광물자원연구본부) ;
  • 손정수 (한국지질자원연구원 광물자원연구본부) ;
  • 강진구 (한국지질자원연구원 광물자원연구본부)
  • Received : 2011.08.16
  • Accepted : 2011.10.20
  • Published : 2011.12.31
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Abstract

Supercritical $CO_2$($scCO_2$) extraction has a great possibility to be a new process to recover metal and to replace the existing leaching/solvent extraction processes. The cobalt extraction was carried out using $scCO_2$ from cobalt sulphate solution. The bis (2,4,4-trimethylpentyl) phosphinic acid and diethylamine ligands were used to extract cobalt ion in $scCO_2$. The recommended method consists of $scCO_2$/extractants complexation process and metal extraction process at 60, 200bar. Experimental results showed that the extraction efficiency of Co was increased by 16-99% with increasing the ligand amount.

초임계 2추출은 기존의 금속추출/용매추출 공정을 대체할 수 있는 새로운 공정으로써의 큰 가능성을 가지고 있는 기술이다. 초임계 2를 이용하여 황산코발트용액으로부터 코발트의 추출에 대한 연구를 수행하였다. 코발트의 추출을 위해 bis (2,4,4-trimethylpentyl) phosphinic acid 및 diethylamine을 초임계 2와 함께 추출제로 사용하였으며 2의 추출거동을 관찰하였다. 초임계 2추출은 $60^{\circ}C$, 200 bar의 조건에서 실시하였고 실험은 초임계 2추출제 착염화과정과 금속추출과정으로 구성된 공정을 이용하여 진행하였다. 실험결과 코발트의 추출률은 추출제 투입량에 따라 16-99%까지 증가하였다.

Keywords

References

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