Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Separation and Adsorption-Desorption Characteristics of Heavy Rare Earth Elements (Gd, Tb, Dy) using P507 Resin

P507 추출수지를 이용한 중희토류 원소(Gd, Tb, Dy)의 흡탈착 분리특성에 관한 연구

  • Lee, Sungeun (Department of Chemical Engineering, Kwangwoon University) ;
  • Kim, Joung Woon (Department of Chemical Engineering, Kwangwoon University) ;
  • Jeon, Jong Hyuk (Department of Chemical Engineering, Kwangwoon University) ;
  • Jun, Hong Myeong (Department of Chemical Engineering, Kwangwoon University) ;
  • Lee, Jin Young (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Han, Choon (Department of Chemical Engineering, Kwangwoon University)
  • 이성은 (광운대학교 화학공학과) ;
  • 김정운 (광운대학교 화학공학과) ;
  • 전종혁 (광운대학교 화학공학과) ;
  • 전홍명 (광운대학교 화학공학과) ;
  • 이진영 (한국지질자원연구원 광물자원연구본부) ;
  • 한춘 (광운대학교 화학공학과)
  • Received : 2016.06.16
  • Accepted : 2016.08.09
  • Published : 2016.08.31
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Abstract

This study was conducted to establish the adsorption-desorption mechanism and the optimum condition of chromatographic operation for separations of heavy rare earth elements (Gd, Tb, Dy) using a p507-containing resin. By employing Langmuir and Freundlich isotherm together with pseudo first and second order kinetics, absorption-desorption reaction mechanism was investigated. Langmuir and Freundlich isotherm was applied under assumption that adsorption reaction occurs in form of monolayer, and because the result was identical to the assumption, now we know adsorption of heavy rare earth elements occurs in form of monolayer. Concerning the pseudo first and second order kinetic, the pseudo second order seemed to be more suitable to represent heavy rare earth element adsorption mechanism. By using the extraction chromatography to separate heavy rare earth elements, ${\alpha}^{Tb}_{Gd}=1.24$, and ${\alpha}^{Dy}_{Tb}=1.03$ were confirmed in eluent HCl 0.25 M which indicates almost perfect separations of three elements. Furthermore, as concentrations of eluent became higher, the resolution value decreased and the elution area got shortened.

본 연구에서는 P507을 포함하고 있는 추출수지를 사용하여 중희토류 원소인 Gd, Tb, Dy의 흡 탈착 반응 메커니즘을 고찰하고 분리를 위한 최적 크로마토그래피법의 반응조건을 도출하였다. 흡 탈착 반응 메커니즘은 흡착등온식인 Langmuir, Freundlich 흡착등온식과, 흡착속도모델인 유사 1차, 2차 반응속도식을 적용하여 고찰하였다. 중희토류 원소의 흡착반응은 단분자층으로 일어난다고 가정하여 흡착등온식을 적용하였고, 잘 일치하여 흡착반응이 단분자층으로 이루어짐을 추측할 수 있었다. 시간별 실험을 진행하여 유사 1차, 2차 반응속도식에 적용한 결과 유사 2차 반응속도식이 추출수지의 중희토류 흡착 메커니즘을 더 잘 표현하였고, 평형흡착량의 실험값은 이론값에 부합하였다. 크로마토그래피법을 이용하여 용리액 HCl 0.25 M 농도조건에서 ${\alpha}^{Tb}_{Gd}=1.24$, ${\alpha}^{Dy}_{Tb}=1.03$으로 분리계수 1이상의 높은 분리조건을 확인하였다. HCl 용리액을 사용하였을 때, 용리액의 농도가 높을수록 분리도는 감소하고 용출구간은 줄어드는 경향을 확인하였다.

Keywords

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