新型乳状液膜萃取RE(Ⅲ)动力学条件研究  

Kinetic Conditions of Extraction of RE(Ⅲ)with a New Emulsion Liquid Membrane

作　　者：雷红霞 李勇 LEI Hongxia;LI Yong(College of Architecture and Environment,Ningxia Institute of Technology,Shizuishan 753000,China;College of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]宁夏理工学院建筑与环境学院,宁夏石嘴山753000 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《湿法冶金》2024年第4期431-436,共6页Hydrometallurgy of China

基　　金：宁夏回族自治区教育厅高等学校科学研究项目资助(NYG2024232);国家自然科学基金资助项目(52074082)。

摘　　要：稀土元素间电子层结构和物理化学性质极其相似,导致其难以分离,因此,稀土元素萃取分离一直是稀土冶金的研究热点问题。研究了以6%D2EHPA为流动载体、5%T154为表面活性剂、3.0mol/LHCl溶液为内水相、磺化煤油为膜溶剂,控制相比(Roi)为1.5制备一种新型乳状液萃取剂。通过用该乳状液萃取剂在硫酸体系下分别萃取La^(3+)、Ce^(3+)、Sm^(3+)、Eu^(3+)、Ho^(3+)和Er^(3+)6种稀土离子,确定了乳状液膜法(ELM)萃取RE(Ⅲ)的最优动力学条件。结果表明:最优动力学条件为乳化时间5min,萃取时间6min,乳水比(Rew)0.5,萃取温度25℃,外水相为稀土元素水溶液;该条件下,La^(3+)最高萃取率为99.92%,最大富集比为3.33,传质速率k=9.35×10^(-10)m/s,ELM对低浓度La^(3+)溶液表现出优异的萃取性能和富集效果。The electron layer structure and physical chemical properties of rare earth elements are very similar,rare earths are difficult to separaterare.Therefore,the extraction of rare earth is always research hot issue in rare earth metallurgy.A new emulsion extractant was prepared with 6% D2EHPA as the flow carrier,5% T154 as the surfactant,3.0 mol/L HCl solution as the inner water phase,sulfonated kerosene as the membrane solvent and control R oi of 1.5.By using the emulsion extractor to extract La^(3+),Ce^(3+),Sm^(3+),Eu^(3+),Ho^(3+)and Er^(3+)in sulfuric acid system,the optimal kinetic conditions for the extraction of RE(Ⅲ)by emulsion film method(ELM)were determined.The results show that under optimal kinetic conditions of emulsification time of 5 min,extraction time of 6 min,emulsion to water ratio(R ew)of 0.5,extraction temperature of 25℃,the outer water phase is rare earth element aqueous solution.the highest extraction rate of La^(3+)is 99.92%,the maximum enrichment ratio is 3.33,and the mass transfer rate k=9.35×10^(-10) m/s.The ELM shows excellent extraction performance and enrichment effect for low concentration La^(3+)solution.

关 键 词：稀土 乳状液膜 萃取 分离 富集 动力学 

分 类 号：TF841.8[冶金工程—有色金属冶金] TF803.2