Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Comparison of the Extraction and Separation Behavior of La, Ce, Pr, Nd, Sm from Light Rare Earth Mixed Solutions by PC88A and Cyanex 572

경희토류 혼합용액에서 PC88A와 Cyanex 572에 의한 La, Ce, Pr, Nd, Sm의 추출·분리 거동 비교

  • Cho, Yeon-Chul (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Lee, Joo-eun (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • So, Hong-Il (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Ahn, Jae-Woo (Department of Advanced Materials Science and Engineering, 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 : 2017.10.18
  • Accepted : 2017.11.15
  • Published : 2018.02.28
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Abstract

Solvent extraction of La, Ce, Pr, Nd and Sm from chloride solutions was studied using PC88A and Cyanex 572 as the extractants. Our results indicated that the acidity of the aqueous solution and saponification degree had some effect on the percentage extraction of metal ions. The distribution coefficient of the metal ions increased with increasing aqueous solution pH in both of PC88A and Cyanex 572. But the $pH_{50}$ value was lowered by about 0.05~0.34 in PC88A. In extraction with saponified Cyanex 572 with NaOH, the distribution coefficients of the metal ions were independent of the degree of saponification, and did little to improve the separation behavior of these metal ions. With Cyanex 572 as the extractant, the separation factor of the binary La/Ce and Nd/Sm was enhanced about 5.0, but Ce/Pr and Pr/Nd showed no difference in separation factor as compared with PC88A. The group separation factor of La/(Pr, Nd, Sm) and (Pr, Nd)/Sm was increased by 3.0~8.0, but for (La, Ce)/(Pr, Nd) and Ce/(Pr, Nd) it was only increased by 0.2~0.7 in the Cyanex 572 system.

Keywords

Acknowledgement

Supported by : 국가과학기술연구회

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