Solvent Extraction Process and Extraction Mechanism for Lithium Recovery from High Mg/Li-Ratio Brine

Shangqing Chen; Xuejiao Nan; Nan Zhang; Long Li; Xiaoping Yu; Yafei Guo; Tianlong Deng

doi:10.1252/jcej.17we230

Separation Engineering

Solvent Extraction Process and Extraction Mechanism for Lithium Recovery from High Mg/Li-Ratio Brine

Shangqing Chen, Xuejiao Nan, Nan Zhang, Long Li, Xiaoping Yu , Yafei Guo, Tianlong Deng

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Keywords: High Mg/Li Ratio Brine, Lithium, Solvent Extraction, Tributyl Phosphate (TBP)+Potassium Hexafluorophosphate (KPF₆), Co-extraction System

JOURNAL RESTRICTED ACCESS

2019 Volume 52 Issue 6 Pages 508-513

DOI https://doi.org/10.1252/jcej.17we230

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Abstract

A co-extraction system of tributyl phosphate (TBP) and KPF₆ was used for lithium ion extraction from brine containing a high ratio of magnesium and lithium. The effects of the phase ratio R(organic/aqueous), aqueous phase pH, and PF₆⁻/Li⁺ molar ratio on the extraction of lithium were studied. The single-stage extraction efficiency of lithium was 82.29% under optimal conditions, and the back-extraction efficiency was 93.99% when using 1 mol/L HCl +3 mol/L NaCl as the stripping agents at R(O/A)=1. The stoichiometry of the extraction complex was investigated by nuclear magnetic resonance spectroscopy and slope analysis.

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