铁基离子液体体系从溶液中萃取锂的动力学研究

doi:10.19964/j.issn.1006-4990.2023-0560

Abstract

Abstract:

In this paper，tributyl phosphate（TBP） was used as an extractant，1，2-dichloroethane（C₂H₄Cl₂） was used as a diluent，and the iron-based ionic liquid 1-butyl-3-methylimidazole iron tetrachloride（［C₄mim］［FeCl₄］） was used as a coextractant to construct TBP-［C₄mim］［FeCl₄］-C₂H₄Cl₂ extraction system.The kinetic process of lithium extraction from solution by TBP-［C₄mim］［FeCl₄］-C₂H₄Cl₂ system was studied by constant interface cell method.The effects of volume fraction of ionic liquid，concentration of lithium in aqueous phase，interface area，stirring rate and temperature on the extraction rate were investigated by single factor experiment.The results showed that the extraction reaction rate could be increased by increasing stirring rate，interface area and temperature.The extraction reaction of Li⁺ by TBP-［C₄mim］［FeCl₄］-C₂H₄Cl₂ system mainly occurred at the phase interface.The apparent activation energy was E_a=10.68 kJ/mol and the extraction process of lithium was controlled by diffusion.The kinetic equation of the extraction system was obtained by linear fitting： $R 2 L i = 1.221 × 10 - 2 c (L i +) 1.347 φ (F e C l 4 -) 0.474 φ (T B P) 1.877$ .The reaction order of Li⁺ concentration，FeCl₄^- concentration and TBP concentration was close to 1，0.5 and 2，respectively.The effect of these three factors on the reaction rate was in the descending order：TBP，Li⁺，FeCl₄^-.This study provided some guidance and reference for in-depth understanding of the mass transfer mechanism and reaction control mode in the process of lithium extraction by ionic liquid system.

Key words: iron-based ionic liquid, kinetics, constant interface cell, extraction of lithium

CLC Number:

TQ131.11

MA Shuqing, LI Changwen, SHI Chenglong, QIN Yaru. Kinetic study of lithium extraction from solution with iron-based ionic liquid system[J]. Inorganic Chemicals Industry, 2024, 56(9): 60-66.

Figures/Tables 8

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Kinetic study of lithium extraction from solution with iron-based ionic liquid system

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