| 离子液体作为绿色介质应用于盐湖卤水中锂提取的研究 |
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| 引用本文： | 宋贤菊,王仕芳,李在均.离子液体作为绿色介质应用于盐湖卤水中锂提取的研究[J].稀有金属,2011,35(3). |
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| 作者姓名： | 宋贤菊 王仕芳 李在均 |
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| 作者单位： | 江南大学化学与材料工程学院,江苏无锡,214122 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 离子液体是一种绿色溶剂,它作为萃取介质可避免传统湿法冶金因有机溶剂挥发产生的环境污染.制备6种1-烷基-3-甲基咪唑六氟磷酸盐离子液体,然后以离子液体(IL)、磷酸三丁酯(TBP)和三氯化铁(FeCl<,3>)分别为萃取介质、萃取剂和协萃剂建立盐湖卤水锂萃取研究模型,以此考察离子液体和萃取条件对锂萃取影响.锂的萃取率随离子液体中烷基碳原子数的增加而增加.但碳原子数超过8的离子液体在室温下呈固态,在萃取过程中出现第三相.因此,1-辛基-3-甲基咪唑六氟磷酸盐被确定为萃取介质.该体系的最佳萃取条件是:TBP/IL:9/1(v/v),水相酸度:0.03 moI·L<'-1>HCl,相比(O/A):1:1和Fe/Li:2:1.在此条件下,锂的单次萃取率和反萃率分别是87%和90%.有机相重复利用十次锂的萃取率变为77%,但水洗有机相去除反萃时带入的HCl锂的萃取率又上升至88%.机制研究表明,Li<'+>与TBP和FeCl<,3>形成极性较小的LiFeCl<,4>·2TBP络合物而被萃取进入有机相,在有机相中加入盐酸因H<'+>极化能力强于Li<'+>而将Li<'+>置换使Li<'+>重新进入水相.LiFeCl<,4>·2TBP在弱极性的离子液体中溶解度优于非极性的溶剂煤油,因此离子液体萃取体系具有更高的锂萃取效率和容量.此外,还进行了盐湖卤水萃取锂的串级实验,结果表明经过三级萃取和二级反萃锂的总提取率大于97%,有机相中镁/锂降低至2.2左右.
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| 关 键 词： | 离子液体 盐湖卤水 锂提取 磷酸三丁酯 三氯化铁 |
Application of Ionic Liquid as Green Medium for Extraction of Lithium from Salt Lake Brine |
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| Song Xianju,Wang Shifang,Li Zaijun.Application of Ionic Liquid as Green Medium for Extraction of Lithium from Salt Lake Brine[J].Chinese Journal of Rare Metals,2011,35(3). |
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| Authors: | Song Xianju Wang Shifang Li Zaijun |
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| Affiliation: | Song Xianju,Wang Shifang,Li Zaijun (School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China) |
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| Abstract: | Ionic liquid is a kind of green solvent and as extraction medium could avoid environmental pollution of conventional hydrometallurgy due to volatilization of organic solvent.Six 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids were prepared and applied to design a model for study on extraction lithium from salt lake brine,in which the ionic liquid,FeCl3 and tributyl phosphate(TBP) were used as extraction medium,synergic reagent and extracting agent respectively,which was employed for investigat... |
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| Keywords: | ionic liquid salt lake brine recovery of lithium tributyl phosphate FeCl3 |
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