30 % TBP/NDD-2 M HNO3 (0.005 M K2Cr2O7 함유) 계에 의해 산화 추출된 Np의 유기상을 대상으로 n-butyraldehyde (NBA)에 의한 Np의 환원 역추출을 고찰하였다. Np의 역추출은 NBA의 농도 증가에 따라, 역추출 수용상 내 질산농도 감소에 따라, 그리고 반응 온도 감소에 따라 증가하였으며, 이때 겉보기 환원 역추출 속도식은 -d [Np]Org./dt =1,524 exp(-2,906/T) [NBA]0.91[H+]-0.92 [Np]Org. 이었다. 1.04M NBA 및 2M HNO3에서 Np 및 U의 역추출률은 각각 70.1 % 및 7.1 % 이며 이때 분리계수((DU/DNp)는 30.4 정도로, TBP-HNO3 계에 의해 공추출된 Np과 U은 NBA에 의해 효과적으로 상호 분리할 수 있음을 알 수 있었다.

The reductive stripping of Np using a n-butyraldehyde (NBA) from loaded organic solutioncontaining Np, which was oxidative-extracted in a system of a 30 % TBP/NDD-2M HNO3andO/A=2 containing 0.005 M K2Cr2O7as an oxidant of Np, was studied. The stripping yields of Npwas increased with an increasing the NBA concentration, with a decreasing the nitric acidconcentration of stripping solution and with a decreasing the reaction temperature. The apparentreductive stripping rate equation was shown by the following equation : -d[Np]Org./dt= 1,524 exp(-2,906/T ) [NBA]0.91[H+]-0.92[Np]Org.At 1.04 M NBA and 2 M HNO3, the stripping yield of Np andU was 70.1 %, and 7.1 %, respectively, and the separation factor of U over Np (=DU/DNp) wasabout 30.4. Therefore, it was found that U and Np co-extracted in a system of TBP-HNO3could beeffectively mutual-separated by the NBA.

Abstract   요 약   I. 서 론   II. 실 험    가. 모의 용액 제조    나. 실험 방법    다. 분석   III. 실험 결과 및 토의    가. Np의 추출    나. Np의 역추출    다. Np의 겉보기 환원 역추출 속도   IV. 결 론   참고문헌

• 이일희(한국원자력연구원(Korea Atomic Energy Research Institute)) | Eil-Hee Lee
• 임재관(한국원자력연구원(Korea Atomic Energy Research Institute)) | Jae-Kwan Lim
• 정동용(한국원자력연구원(Korea Atomic Energy Research Institute)) | Dong-Yong Chung
• 양한범(한국원자력연구원(Korea Atomic Energy Research Institute)) | Han-Beom Yang
• 김광욱(한국원자력연구원(Korea Atomic Energy Research Institute)) | Kwang-Wook Kim