离子液体/金属盐萃取体系用于高镁卤水提锂的研究
Study on extraction lithium from brine with high magnesium using ionic liquid/metal salt extraction system
周万嵇 1黎四霞2
作者信息
- 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
- 折叠
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.
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 effi-ciency 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 strip-ping 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.
关键词
萃取/高镁锂比/磷酸三丁酯/离子液体/提锂Key words
extraction/high Mg/Li ratio/tributyl phosphate/ionic liquid/lithium extraction引用本文复制引用
基金项目
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()
出版年
2024
NETL
NSTL
万方数据