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http://dx.doi.org/10.7844/kirr.2018.27.6.53

Solvent Extraction of Li(I) from Weak HCl Solution with the Mixture of Neutral Extractants Containing FeCl3  

Xing, Weidong (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Lee, Seah (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Lee, Manseung (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Publication Information
Resources Recycling / v.27, no.6, 2018 , pp. 53-58 More about this Journal
Abstract
Solvent extraction of Li(I) from weak HCl solution was investigated by the mixture of TBP/MIBK with other neutral extractants such as Cyanex 923, TOPO and TOP. The TBP/MIBK organic phase was loaded with 0.1 M $FeCl_3$ at different HCl concentrations (1-9 M). Extraction of Li(I) from weak HCl solution is related to the stability of $FeCl_3$ in the organic mixture. As HCl concentration increased in preparing the loaded TBP phase, the stripping percentage of Fe(III) during the extraction of Li(I) became reduced and thus Li(I) could be extracted by ion exchange reaction with hydrogen ion in the organic. The concentration of TBP in the extractant mixture affected the stability of $FeCl_3$. Compared to TBP, Fe(III) was easily stripped from the loaded MIBK and thus no Li(I) was extracted by the mixture with MIBK. The nature of neutral extractant with TBP/MIBK showed little difference in the extraction of Li(I) and stripping of Fe(III).
Keywords
Lithium; Extraction; Neutral extractants; Weak hydrochloric acid; $FeCl_3$;
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