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• W4324127778 endingPage "116543" @default.
• W4324127778 startingPage "116543" @default.
• W4324127778 abstract "Lithium is a vital aspect of the strategic development of the alternative energy and nuclear industries, and the demand for this metal is currently increasing rapidly. China possesses significant lithium resources, nearly 80 % of which are situated in salt lake brine. Solvent extraction is a viable means of extracting lithium ions from brine that has high magnesium-to-lithium ratio, and provides high selectivity along with ready scale-up to industrial production levels. The most common extraction technology for such scenarios is the tributyl phosphate (TBP)-FeCl3-kerosene system. However, this system tends to lose Fe3+ during the extraction process and the concurrent use of acid and alkali can seriously affect the stability of the organic phase. The present work demonstrates a new extraction process employing TBP as the main extractant, sodium tetraphenyl boron as a co-extractant and phenethyl isobutyrate as a diluent. Optimization of the relative amounts of these components along with the phase ratio provided a single-stage lithium ion extraction efficiency of 85.70 % together with a separation factor of lithium to magnesium ions of 1175. The organic phase was washed with a LiCl + NaCl solution to remove impurity ions then stripped five times with a NaHCO3 solution, with a Li+ stripping efficiency >99 %. During ten replicate extractions, the Li+ extraction efficiency remained stable at approximately 84 %, demonstrating good stability. NMR spectra verified that the binding strength of metal cations to TBP decreased in the order of Li+ > Na+ ≫ Mg2+, indicating selectivity for the extraction of Li+. This single step NaHCO3 method was adopted to simplify the extraction process. The overall strategy avoids the use of strong acids or bases that otherwise corrode equipment and provides greatly improved long-term stability of the organic phase." @default.
• W4324127778 created "2023-03-15" @default.
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• W4324127778 date "2023-06-01" @default.
• W4324127778 modified "2023-10-14" @default.
• W4324127778 title "Selective extraction of lithium ions from salt lake brines using a tributyl phosphate-sodium tetraphenyl boron-phenethyl isobutyrate system" @default.
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• W4324127778 doi "https://doi.org/10.1016/j.desal.2023.116543" @default.
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