Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Extraction & Separation Behavior of Light Rare Earth Elements from the Mixed Solutions by Cyanex 572

경희토류(La, Ce, Pr, Nd, Sm) 혼합용액에서 Cyanex 572에 의한 추출·분리 거동 고찰

  • Cho, Yeon-Chul (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • Lee, Joo-Eun (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • So, Hong-Il (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • Ahn, Jae-Woo (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • Kim, Hong-In (Covergence Research Center for Development of Mineral Resources (DMR) Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Jin-Young (Covergence Research Center for Development of Mineral Resources (DMR) Korea Institute of Geoscience and Mineral Resources)
  • 조연철 (대진대학교 신소재공학과) ;
  • 이주은 (대진대학교 신소재공학과) ;
  • 소홍일 (대진대학교 신소재공학과) ;
  • 안재우 (대진대학교 신소재공학과) ;
  • 김홍인 (한국지질자원연구원 DMR융합연구단) ;
  • 이진영 (한국지질자원연구원 DMR융합연구단)
  • Received : 2017.07.10
  • Accepted : 2017.08.10
  • Published : 2017.08.31
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Abstract

Extraction and separation behaviors of La, Ce, Pr, Nd and Sm from light rare earth multi - component mixed solutions by Cyanex 572 were studied. As extractant concentration increased, the $pH_{50}$ values of all the five components decreased. When extractant concentration was larger than 0.6 M, the separation factor of La and Ce, Nd and Sm was higher than 10, while the separation factor between Ce and Pr, Pr and Nd was as low as 0.5~2.2. Addition of TBP to the 0.6 M Cyanex 572 had little synergistic effect on the phase separation rate and separation factor. From the analysis of experiment results, group separation of [La]/[Pr, Nd, Sm] and [Pr, Nd]/[Sm] could be possible, but in case of the group separation between [La, Ce] and [Pr, Nd] was not available because of the low separation factor between Ce and Pr.

Cyanex 572에 의한 경희토류 다성분 혼합 용액에서 La, Ce, Pr, Nd, Sm의 분리특성에 대해 연구하였다. 5성분계 혼합 용액에서 추출제 농도가 증가할수록 5성분 모두 $pH_{50}$(추출율이 50%인 pH) 값은 감소하였다. 추출제 농도 0.6 M 이상에서 La과 Ce, Nd와 Sm 는 10 이상의 분리계수 값을 보인 반면, Ce과 Pr, Pr과 Nd 사이의 분리계수는 0.5~2.2로 낮았다. 분리계수 개선을 위해 0.6 M Cyanex 572에 TBP를 첨가하였으나 상 분리 속도나 분리계수 개선 효과는 나타나지 않았다. 실험 결과를 고찰한 결과, La/(Pr, Nd, Sm) 그룹과 (Pr, Nd)/Sm 의 경우는 그룹 별 분리는 가능할 것으로 보이나, (La, Ce) 과 (Pr, Nd)의 그룹분리는 Ce와 Pr 사이의 분리계수가 낮아 어려울 것으로 사료된다.

Keywords

References

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