Extraction relationship of Li+ and H+ using tributyl phosphate in the presence of Fe(III) |
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| Authors: | Hui Su Zheng Li Lina Wang Tao Qi |
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| Affiliation: | 1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing, China;2. Key Laboratory of Green Process and Engineering, Institute of ProcessEngineering, Chinese Academy of Sciences, Beijing, China;3. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, China;4. Department of Chemistry, KU Leuven, Heverlee, Belgium |
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| Abstract: | ABSTRACTDuring the extraction of lithium from high Mg-containing salt lake brines by tributyl phosphate (TBP) in the presence of Fe(III), H+ is used to stabilize Fe(III). However, the distribution ratio of H+ (DH) is 4–6 times higher than that of Li+ (DLi), which affects the extraction of Li+ significantly. In this study, the competition mechanism between H+ and Li+ was investigated by spectral analysis and thermodynamic equilibrium. The extracted species are determined as HFeCl4 · 2TBP and LiFeCl4 · 2TBP for H+ and Li+, respectively. The apparent equilibrium constants are KH = 799.8 and KLi = 120.6, respectively. Both equilibrium constants and the distribution ratios for H+ and Li+ extraction show that extraction of H+ is stronger than Li+. |
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| Keywords: | Lithium H+ competition mechanism apparent equilibrium constant tributyl phosphate |
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