双咪唑离子液体体系从盐湖卤水中萃取锂的动力学研究  

Study on Kinetics of Extraction of Lithium from Salt Lake Brine by Diimidazole Ionic Liquid System

作　　者：马淑清 李昌文 王琪慧 陈雪琳 秦亚茹 石成龙 Ma Shuqing;Li Changwen;Wang Qihui;Chen Xuelin;Qin Yaru;Shi Chenglong(School of Chemistry and Chemical Engineering,Qinghai Minzu University,Xining 810007,China;Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China)

机构地区：[1]青海民族大学化学化工学院,西宁810007 [2]中国科学院青海盐湖研究所,西宁810008

出　　处：《青海科技》2024年第1期116-121,129,共7页Qinghai Science and Technology

基　　金：青海省自然科学基金项目(2020-ZJ-953Q);青海民族大学校级规划项目(2022GH12)。

摘　　要：文章采用恒界面池法研究TBP-[C_(4)(mim)_(2)][Fe Cl_(4)]-MIBK体系从溶液中萃取锂的动力学过程。考察了搅拌速率、恒界面面积、温度、[C_(4)(mim)_(2)][Fe Cl_(4)]浓度、TBP浓度等因素对萃取速率的影响。实验结果表明,双咪唑离子液体体系萃取锂的反应主要发生在两相界面区域。萃取反应的表观活化能为E_(a)=13.671 k J/mol,萃取反应受扩散控制。TBP-[C_(4)(mim)_(2)][Fe Cl_(4)]-MIBK体系萃取锂的动力学方程为:R_(Li)=1.291×10^(-2)[Li+]^(0.995)[TBP]^(2.051)[C_(4)(mim)_(2)·FeCl_(4)^(-)]^(0.937)。In this paper,the kinetic process of lithium extraction from solution by TBP-[C_(4)(mim)_(2)][FeCl_(4)]-MIBK system was studied by constant interface cell method.The effects of stirring rate,constant interface area,temperature,[C_(4)(mim)_(2)][FeCl_(4)]concentration and TBP volume fraction on the extraction rate were investigated.The experimental results showed that the extraction reaction of lithium by diimidazole ionic liquid system mainly occurred in the two-phase interface region.The apparent activation energy of the extraction reaction was E_(a)=13.671 kJ/mol and the extraction reaction was controlled by diffusion.The kinetic equation of lithium extraction by TBP-[C_(4)(mim)_(2)][FeCl_(4)]-MIBK system was R_(Li)=1.291×10^(-2)[Li+]^(0.995)[TBP]^(2.051)[C_(4)(mim)_(2)·FeCl_(4)^(-)]^(0.937).

关 键 词：双咪唑离子液体 恒界面池法 动力学 锂 

分 类 号：TQ028.4[化学工程]