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Study on extraction lithium from brine with high magnesium using ionic liquid/metal salt extraction system
Received date: 2023-12-12
Online published: 2024-04-11
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
ZHOU Wanji , LI Sixia . Study on extraction lithium from brine with high magnesium using ionic liquid/metal salt extraction system[J]. Inorganic Chemicals Industry, 2024 , 56(9) : 54 -59 . DOI: 10.19964/j.issn.1006-4990.2023-0597
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