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Separation of Copper & Cobalt by Solvent Extraction in Organic Acid Leaching Solution

유기산 침출용액에서 용매추출법에 의한 구리 및 코발트 분리

  • Kim, Tae-Young (Dept. of Advanced Materials Sci. & Eng., Daejin University) ;
  • Ryu, Seong-Hyung (Dept. of Advanced Materials Sci. & Eng., Daejin University) ;
  • Ahn, Jae-Woo (Dept. of Advanced Materials Sci. & Eng., Daejin University)
  • Received : 2014.12.26
  • Accepted : 2015.03.23
  • Published : 2015.06.30

Abstract

A study has been made on the recovery & separation of cobalt and copper from organic acid leaching solution by solvent extraction. The experimental parameters such as the equilibrium pH, concentration of extractant and phase ratio were observed. Copper was extracted using LIX 84 and Cobalt was extracted using cyanex 272 and versatic acid 10. Experimental results showed that extraction percent of copper was 99% at above eq. pH 2.0 and then more than 90% of cobalt were extracted by cyanex 272 in eq. pH 6.0 and versatic acid 10 in eq. pH 7.5. Stripping of copper and cobalt from the loaded organic phases can be accomplished by sulfuric acid as a stripping reagent and 120 ~ 150 g/L of $H_2SO_4$ was effective for the stripping of copper and cobalt respectively. Finially, the basic optimal process for recovery of copper and cobalt from the bio-leaching solution was proposed.

코발트와 구리가 함유된 유기산 침출용액으로부터 용매추출법을 이용하여 구리와 코발트의 분리 회수를 위한 기초 연구를 실시하였다. 구리와 코발트의 추출에 영향을 미칠 수 있는 평형 pH, 추출제의 농도, 상비 변화에 대하여 용매 추출 실험을 진행하였다. 구리 추출제로 LIX 84, 코발트 추출제로 Cyanex 272 및 Versatic acid 10을 사용하였는데 실험 결과 구리의 경우 평형 pH 2.0 이상에서 약 99%의 추출율을 보였고, 코발트의 경우는 추출제로 Cyanex 272를 사용 시 평형 pH 6.0에서 Versatic acid 10 사용 시에는 평형 pH 7.5에서 각각 90% 이상의 추출율을 나타내었다. 한편, 구리와 코발트를 탈거하기 위한 탈거제로 최적의 황산농도는 120 ~ 150 g/L 이었다. 그리고 구리 및 코발트가 함유된 미생물 침출용액에서 구리와 코발트를 회수할 수 있는 기초 최적 공정을 제시하였다.

Keywords

References

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