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

• Published in: Chinese 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
• Language: English
• 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
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(08)60196-2

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.