Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by [A336][NO3] using the single drop technique

被引：0
作者：
Xiaoqin Wang [1 ,2 ]
Kun Huang [1 ,2 ]
Wenjuan Cao [2 ,3 ]
Pan Sun [2 ,3 ]
Weiyuan Song [2 ,3 ]
Huizhou Liu [2 ,3 ]
机构：
[1] School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
[2] CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences
[3] University of Chinese Academy of Sciences
来源：
Chinese Journal of Chemical Engineering | 2020年 / 28卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Praseodymium; Neodymium; A336][NO3; Kinetics; Single drop technique;
D O I：
暂无
中图分类号：
O658.2 [萃取法]; O614.33 [镧系元素（稀土元素）];
学科分类号：
070301 ; 070302 ; 081704 ;
摘要：
The kinetics and the difference for Pr(Ⅲ) and Nd(Ⅲ) extraction from nitrate aqueous solution using trialkylmethylammonium nitrate([A336][NO3]) as extractant were investigated by the single drop technique.The dependence of the extraction rate of Pr(Ⅲ) and Nd(Ⅲ) on the concentrations of free Pr(Ⅲ) and Nd(Ⅲ)ions, the concentrations of Na NO3and H+in aqueous solutions, and the concentrations of [A336][NO3] in kerosene solutions were discussed and the corresponding extraction rate equations for Pr(Ⅲ) and Nd(Ⅲ) were obtained. These equations demonstrated that the reaction rate constant of Pr(Ⅲ) with [A336][NO3] was double than that of Nd(Ⅲ). The effect of the addition of diethylenetriaminepentaacetic acid(DTPA) on the difference in the extraction rate of Pr(Ⅲ) and Nd(Ⅲ) by [A336][NO3] was also investigated. It was revealed that the difference in the complex formation rates of Pr(Ⅲ) and Nd(Ⅲ) with DTPA made a significant impact on the difference in the extraction rates of Pr(Ⅲ) and Nd(Ⅲ) with [A336][NO3]. The ratio of extraction rates of Pr(Ⅲ) to Nd(Ⅲ) with[A336][NO3] was in proportion to the ratio of complex formation rates of Pr(Ⅲ) to Nd(Ⅲ) with DTPA. The extraction rate difference for Pr(Ⅲ) and Nd(Ⅲ) with [A336][NO3] increased due to a higher complex formation rate constant of DTPA with the free and un-complexed Nd(Ⅲ) ions in the aqueous nitrate solution than that with Pr(Ⅲ) ions. Therefore, the addition of DTPA in the aqueous nitrate solution is an effective method to intensify the separation of Pr(Ⅲ) and Nd(Ⅲ) in kinetics. The study on the extraction mechanism indicated that both the extraction of Pr(Ⅲ) and Nd(Ⅲ) by [A336][NO3] were diffusion controlled, and the reactions obeyed SN2 mechanism. The present work highlights a possible approach to strengthen the kinetic separation of Pr(Ⅲ) and Nd(Ⅲ).
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页码：1326 / 1333
页数：8
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