Kinetics of Reactive Extraction of Nd from Nd2O3 with TBP-HNO3 Complex in Supercritical Carbon Dioxide

The process based on supercritical fluid extraction for reprocessing of the spent nuclear fuel has some remarkable advantages over the plutonium-uranium extraction （PUREX） process. Especially, it can minimize the generation of secondary waste. Dynamic reactive extraction of neodymium oxide （Nd2O3） i...

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Published inChinese journal of chemical engineering Vol. 17; no. 2; pp. 214 - 218
Main Author 朱礼洋 段五华 徐景明 朱永[贝睿]
Format Journal Article
LanguageEnglish
Published 01.04.2009
Subjects
Nd2O3
动力学过程
反应萃取
复合物
氧化钕
磷酸三丁酯
超临界二氧化碳
Online AccessGet full text
ISSN1004-9541
2210-321X
DOI10.1016/S1004-9541(08)60196-2

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Abstract The process based on supercritical fluid extraction for reprocessing of the spent nuclear fuel has some remarkable advantages over the plutonium-uranium extraction （PUREX） process. Especially, it can minimize the generation of secondary waste. Dynamic reactive extraction of neodymium oxide （Nd2O3） in supercritical carbon dioxide （SC-CO2） containing tri-n-butyl phosphate-nitric acid （TBP-HNO3） complex was investigated. Temperature showed a positive effect on the extraction efficiency, while pressure showed a negative effect when the unsaturated TBP-HNO3 complex was employed for the dynamic reactive extraction of Nd2O3 in SC-CO2. Both temperature and pressure effects indicated that the kinetic process of the reactive extraction was controlled by the chemical reaction. A kinetic model was proposed to describe the extraction process.
AbstractList The process based on supercritical fluid extraction for reprocessing of the spent nuclear fuel has some remarkable advantages over the plutonium-uranium extraction (PUREX) process. Especially, it can minimize the generation of secondary waste. Dynamic reactive extraction of neodymium oxide (Nd2O3) in supercritical carbon dioxide (SC-CO2) containing tri-n-butyl phosphate-nitric acid (TBP-HNO3) complex was investigated. Temperature showed a positive effect on the extraction efficiency, while pressure showed a negative effect when the unsaturated TBP-HNO3 complex was employed for the dynamic reactive extraction of Nd2O3 in SC-CO2. Both temperature and pressure effects indicated that the kinetic process of the reactive extraction was controlled by the chemical reaction. A kinetic model was proposed to describe the extraction process.
The process based on supercritical fluid extraction for reprocessing of the spent nuclear fuel has some remarkable advantages over the plutonium-uranium extraction （PUREX） process. Especially, it can minimize the generation of secondary waste. Dynamic reactive extraction of neodymium oxide （Nd2O3） in supercritical carbon dioxide （SC-CO2） containing tri-n-butyl phosphate-nitric acid （TBP-HNO3） complex was investigated. Temperature showed a positive effect on the extraction efficiency, while pressure showed a negative effect when the unsaturated TBP-HNO3 complex was employed for the dynamic reactive extraction of Nd2O3 in SC-CO2. Both temperature and pressure effects indicated that the kinetic process of the reactive extraction was controlled by the chemical reaction. A kinetic model was proposed to describe the extraction process.
Author 朱礼洋 段五华 徐景明 朱永[贝睿]
AuthorAffiliation Institute of Nuclear and New Energy. Technology, Tsinghua University, Beij ing 102201, China
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SubjectTerms Nd2O3
动力学过程
反应萃取
复合物
氧化钕
磷酸三丁酯
超临界二氧化碳
Title Kinetics of Reactive Extraction of Nd from Nd2O3 with TBP-HNO3 Complex in Supercritical Carbon Dioxide
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