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

Abstract

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.

Key words: supercritical carbon dioxide, kinetics, reactive extraction, TBP-HNO₃ complex, Nd₂O₃

摘要： 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.

关键词: supercritical carbon dioxide, kinetics, reactive extraction, TBP-HNO₃ complex, Nd₂O₃

ZHU Liyang, DUAN Wuhua, XU Jingming, ZHU Yongjun. Kinetics of Reactive Extraction of Nd from Nd₂O₃ with TBP-HNO₃ Complex in Supercritical Carbon Dioxide[J]. , 2009, 17(2): 214-218.

朱礼洋, 段五华, 徐景明, 朱永. Kinetics of Reactive Extraction of Nd from Nd₂O₃ with TBP-HNO₃ Complex in Supercritical Carbon Dioxide[J]. , 2009, 17(2): 214-218.

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

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

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