Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Separation of Actinides and Lanthanides by DEHPA Extractant(II)

DEHPA 추출제에 의한 악티늄족원소와 란탄족원소의 상호분리연구(II)

  • Yang, H.B. (Nuclear Environment Management Center at KAERI) ;
  • Lee, E.H. (Nuclear Environment Management Center at KAERI) ;
  • Lim, J.K. (Nuclear Environment Management Center at KAERI) ;
  • Yoo, J.H. (Nuclear Environment Management Center at KAERI) ;
  • Park, H.S. (Nuclear Environment Management Center at KAERI)
  • 양한범 (한국원자력연구소 부설 원자력환경관리센타) ;
  • 이일희 (한국원자력연구소 부설 원자력환경관리센타) ;
  • 임재관 (한국원자력연구소 부설 원자력환경관리센타) ;
  • 유재형 (한국원자력연구소 부설 원자력환경관리센타) ;
  • 박현수 (한국원자력연구소 부설 원자력환경관리센타)
  • Received : 1995.10.10
  • Accepted : 1995.11.15
  • Published : 1996.02.12
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Abstract

Several main nuclides($^{241}Am$, $^{152}Eu$ and $^{237}Np$) in radioactive waste solution were selected and examined to mutual separation with di-(2-ethylhexyl) phosphoric acid by solvent extraction technique. $^{237}Np$ was extracted more than 99.9% adding the $H_2O_2$ that was a good reductant for the oxidation state control of $^{237}Np$. $^{241}Am$, $^{152}Eu$ and $^{237}Np$ could be fairly well separated one another during the different sequence stripping stages, but about 7~9.6% of the other nuclides were still remained for the $^{241}Am$ stripping solution. This result shows that the product of $^{152}Eu$ and $^{237}Np$ was good, but $^{241}Am$ may be needed to further purification process. It was also discussed on the cause of the third phase formation phenomenon that was found in the solvent regeneration.

방사성폐액 중 주요 핵종인 $^{241}Am$, $^{152}Eu$ 및 $^{237}Np$를 선정하여 추출제 di-(2-ethylhexyl) phosphoric acid를 사용한 용매추출법으로 이들 세 가지 핵종의 상호분리에 대해 연구하였다. $^{237}Np$의 추출율을 향상시키기 위해 환원제로 $H_2O_2$를 첨가하여 추출한 결과 $^{241}Am$, $^{152}Eu$ 및 $^{237}Np$ 핵종 모두 99.9% 이상 추출할 수 있었다. 추출된 $^{241}Am$, $^{152}Eu$ 및 $^{237}Np$는 세 단계의 역추출과정을 통해 상호분리한 결과 $^{152}Eu$와 $^{237}Np$의 경우 상호분리도가 좋았으나, $^{241}Am$의 경우 약 7~9.6%의 $^{152}Eu$와 $^{237}Np$가 동반 역추출되어 $^{241}Am$ 용액에 대한 정제과정이 추가로 요구되었다. 용매재생과정에서 생성되는 제3상의 생성원인과 해결방법에 대해서도 논하였다.

Keywords

References

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