Solvent Extraction of Some Lanthanides with Trioctylphosphine Oxide in Molten Paraffin Wax

作     者：Bi Wang, Xiaojun Guo, Haiyan Fan, Bo Peng, Jinzhang Gao (Department of Chemistry, Northwest Normal University, Lanzhou 730070, China Dept. of Leather Engineering, Sichuan University, Chendu 610065, China.) 

作者机构：NW Normal Univ Dept Chem Lanzhou 730070 Peoples R China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2001年第20卷第1期

页      面：18-23页

核心收录：

学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：the Natural Science Foundation of Gansu Province  China 

主　　题：lanthanides trioctylphosphine oxide extraction molten paraffin 

摘      要：The extraction behavior of Ln(III) (Ln=Nd, Sm, Tb and Yb) with trioctylphosphine oxide (TOPO) in molten paraffin wax has been studied. The effect of pH, TOPO concentration, medium, stirring time and the amount of sails added on the distribution of lanthanides between two phases were investigated. Two different compositions Ln(H2O)(t-2) (TOPO)(2)(OH)(2)NO3 (Ln=Nd and Sm) and Ln(H2O)(s-1) (TOPO)(2)(OH)(NO3)(2) (Ln=Tb and Yb) were determined by slope analysis method. The equilibrium extraction constant K-ex and pH(1/2) value were calculated and the thermodynamic parameters were obtained from the dependence of K-ex on the temperature.