无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2024, Vol. 56 ›› Issue (9): 54-59.doi: 10.19964/j.issn.1006-4990.2023-0597

• 研究与开发 • 上一篇    下一篇

离子液体/金属盐萃取体系用于高镁卤水提锂的研究

周万嵇1(), 黎四霞2   

  1. 1.青海大学化工学院,青海 西宁 810016
    2.青海师范大学化学化工学院,青海 西宁 810016
  • 收稿日期:2023-12-12 出版日期:2024-09-10 发布日期:2024-09-26
  • 作者简介:周万嵇(1985— ),男,博士,副教授,主要从事盐湖资源分离提取相关材料的研发;E-mail:617787057@qq.com
  • 基金资助:
    青海大学部省合建盐湖化工大型系列研究设施资助项目(2023-DXSSZZ-02);青海省“昆仑英才?高端创新创业人才”项目

Study on extraction lithium from brine with high magnesium using ionic liquid/metal salt extraction system

ZHOU Wanji1(), LI Sixia2   

  1. 1.School of Chemical Engineering,Qinghai University,Xining 810016,China
    2.School of Chemistry and Chemical Engineering,Qinghai Normal University,Xining 810016,China
  • Received:2023-12-12 Published:2024-09-10 Online:2024-09-26

摘要:

通过研究不同金属盐共萃剂、不同萃取体系对锂镁萃取率及离子液体阳离子损失率的影响,确定出最佳的萃取体系为1-辛基-3-甲基咪唑六氟磷酸盐([C8mim]PF6)/六氟磷酸钠(NaPF6)/磷酸三丁酯(TBP)。考察了[C8mim]PF6浓度、NaPF6浓度、相比对[C8mim]PF6/NaPF6/TBP萃取体系锂镁萃取率及离子液体阳离子损失率的影响,确定最佳的[C8mim]PF6浓度为0.2 mol/L,NaPF6浓度为0.2 mol/L,两者相比(体积比)为2.5;在最佳萃取条件下,锂的单级萃取率为80.5%,镁的单级萃取率为6.5%,离子液体阳离子损失率为2.6%。最佳反萃盐酸浓度为1.0 mol/L,反萃相比(体积比)为2.5;在最佳反萃条件下,锂和镁的反萃率分别为95.2%和99.0%。[C8mim]PF6/NaPF6/TBP萃取体系能够实现锂的高效萃取,并且能够降低离子液体中阳离子的损失率,其可为用于高镁锂比卤水提锂的新型离子液体/金属盐萃取体系开发提供借鉴。

关键词: 萃取, 高镁锂比, 磷酸三丁酯, 离子液体, 提锂

Abstract:

The optimal extraction system was determined to be 1-octyl-3-methylimidazole hexafluorophosphate([C8mim]PF6)/sodium hexafluorophosphate(NaPF6)/tributyl phosphate(TBP) by studying the effects of different metal salt co-extraction reagent,and different extraction systems on the extraction efficiency of lithium and magnesium,and the cation loss rate of ionic liquid.The effects of [C8mim]PF6 concentration,NaPF6 concentration and phase ratio on the extraction efficiency of lithium and magnesium,and the cation loss rate of ionic liquid in[C8mim]PF6/NaPF6/TBP/extraction system were investigated,it was concluded that[C8mim]PF6 concentration was 0.2 mol/L,NaPF6 concentration was 0.2 mol/L,and phase ratio was 2.5.Under the optimum extraction conditions,the single stage extraction efficiency of lithium was 80.5%,the single stage extraction efficiency of magnesium was 6.5%,and the cation loss rate of ionic liquid was 2.6%.The optimum concentration of hydrochloric acid for stripping was 1 mol/L,and the stripping phase ratio was 2.5.Under the optimum stripping conditions,the stripping efficiency of lithium and magnesium was 95.2% and 99.0%,respectively.[C8mim]PF6/NaPF6/TBP extraction system could efficiently extract lithium,and reduce the cation loss rate of ionic liquid.It could be used as a reference for the development of a new ionic liquid/metal salt extraction system for extracting lithium from brine with high magnesium lithium ratio.

Key words: extraction, high Mg/Li ratio, tributyl phosphate, ionic liquid, lithium extraction

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