Studies on Temperature Dependent Ionic Liquid Solid-Liquid Extraction Behavior of Rare Earth

Abstract:

Temperature dependent solid-liquid extraction behavior of eight rare earth elements (REs) was investigated using N-butyl pyridinium hexafluorophosphate ([BPPF₆) as an ionic liquid solvent and 8-hydroxyquinoline (HQ) as an extractant at 80 °C. Parameters including the amount of [BPPF₆, HQ concentration, extraction time, extraction temperature and pH were investigated and optimized. The extracted species was neutral REQ₃ in the RE³⁺-[BPPF₆-HQ solid-liquid extraction system. The extraction percentage of RE³⁺ could be higher than 99%. The recovery of RE³⁺ extracted into [BPPF₆ can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid as stripping agents. The extraction equilibrium constants and the pH_1/2 values of eight REs and their separation factors between adjacent rare earths were estimated and comparatively studied. REs were extracted into solid ionic liquid phase with smaller volume and concentrated to some extent. Furthermore the temperature dependent solid-liquid extraction allows to recover [BPPF₆ after the extraction procedures. These results indicate that the proposed procedure can be used for the preconcentration and separation of REs using [BPPF₆ with high melting point.

• Periodical: Applied Mechanics and Materials (Volumes 401-403)
• Pages: 817-821
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.401-403.817
• Online since: September 2013
• Authors: Zhong Wei Pan, Wen Ting Weng, Hui Bing Yan, Yu Li Yu, Tian Ci Wu, Jing Ding Pan
• Keywords: 8-Hydroxyquinoline, Ionic Liquid (IL), Rare Earth, Solid-Liquid Extraction

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