【摘 要】
：
It is well known that separation of adjacent lanthanide elements,such as Pr and Nd,is very difficult because of their extremely similar physical and chemical properties [1].Traditionally,thermodynamic
【机 构】
：
Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of
【出 处】
：
第七届国际分离科学与技术会议(Proceedings of the 7th International Conferen
论文部分内容阅读
It is well known that separation of adjacent lanthanide elements,such as Pr and Nd,is very difficult because of their extremely similar physical and chemical properties [1].Traditionally,thermodynamic separation factor between Pr and Nd in oil-water two phase extraction is below 2 [2].In present work,a kinetic non-equilibrium extraction method for separation of praseodymium (Pr) from neodymium (Nd) is proposed.Diethylenetriaminepentaacetic acid (DTPA) were previously added into aqueous solution containing Pr and Nd,then organic solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl Ester (P507) in kerosine was added to contact with the aqueous phase.Various influences from solution pH values,the initial DTPA concentration,Pr and Nd ion concentrations,molar ratio of Pr to Nd in feed solutions on kinetic separation of Pr and Nd were investigated.Experimental results indicated that kinetic separation factor of Pr/Nd in P507 organic phase can achieve above 5 under appropriate conditions.It was found that dissociation reactions of DTPA-Ln(Pr/Nd) complex play an important role in kinetic separation of Pr and Nd.Kinetic separation mechanism of Pr and Nd was discussed.The present works highlight a novel approach to achieve kinetic non-equilibrium extraction and separation of adjacent lanthanide elements,so that it is a promising technique for future industrial application for purification of rare-earths.
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