离子液体/金属盐萃取体系用于高镁卤水提锂的研究

doi:10.19964/j.issn.1006-4990.2023-0597

Abstract

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

CLC Number:

TQ132.2

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.

Figures/Tables 8

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Inorganic Acid-Base-Salt Committee of CIESC

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

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