离子液基体系Cyanex923(925)/[C_8mim][PF_6]和TBP/[A336][NO_3]萃取钪的研究

Application of RTIL-Based System Cyanex923(925)/[C_8mim][PF_6] and TBP/[A336][NO_3] in Scandium(Ⅲ) Extraction

对Cyanex923(925)/[C8mim][PF6]和TBP/[A336][NO3]两个离子液基体系在萃取Sc(Ⅲ)中的应用进行了研究。实验表明,由于空间位阻较小,Cyanex923在[C8mim][PF6]中对Sc(Ⅲ)的萃取能力明显优于Cyanex925。温度对Cyanex923/[C8mim][PF6]体系萃取Sc(Ⅲ)的影响较小。与[C8mim][PF6]相反,[A336][NO3]在水中的浓度随酸度增加逐步减少。TBP/[A336][NO3]对Sc(Ⅲ)具有较高的萃取率。

Two RTIL-based systems of Cyanex923 （925） / [ Csmim ] [ PF6 ] and TBP/[ A336 ] [ NO3 ] were studied for the Sc（ Ill ） extraction. As indicated by experiment, Cyanex923 demonstrated better extraction efficiency for Sc （ Ⅲ ） than Cyanex925 since the steric effect. In additional, the relationship of lgDso with temperature showed that temperature had little influence on the extraction process. In contrast to [ Csmim] [PF6], the concentration of [A336] [NO3] in aqueous phase decreased as the acidity increased. TBP/ [A336] [ NO3 ] indicated higher extraction effciency for Sc（ Ⅲ ）.