Selective Separation of Lithium,Magnesium and Calcium using 4-Phosphoryl Pyrazolones as pH-Regulated Receptors |
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| Authors: | Jianfeng Zhang Narisara Tanjedrew Dr. Marco Wenzel Philipp Royla Prof. Dr. Hao Du Prof. Dr. Supavadee Kiatisevi Prof. Dr. Leonard F. Lindoy Prof. Dr. Jan J. Weigand |
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| Affiliation: | 1. Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany;2. Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400 Thailand;3. National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 China;4. School of Chemistry, F11, University of Sydney, Sydney, NSW-2006 Australia |
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| Abstract: | Ensuring continuous and sustainable lithium supply requires the development of highly efficient separation processes such as LLE (liquid-liquid extraction) for both primary sources and certain waste streams. In this work, 4-phosphoryl pyrazolones are used in an efficient pH-controlled stepwise separation of Li+ from Ca2+, Mg2+, Na+ and K+. The factors affecting LLE process, such as the substitution pattern of the extractant, diluent/water distribution, co-ligand, pH, and speciation of the metal complexes involved, were systematically investigated. The maximum extraction efficiency of Li+ at pH 6.0 was 94 % when Mg2+ and Ca2+ were previously separated at pH<5.0, proving that the separation of these ions is possible by simply modulating the pH of the aqueous phase. Our study points a way to separation of lithium from acid brine or from spent lithium ion battery leaching solutions, which supports the future supply of lithium in a more environmentally friendly and sustainable manner. |
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| Keywords: | Ca/Mg/Li Separation Di- and Trinuclear Complexes Separation Science pH-Regulated Receptors 4-Phosphoryl Pyrazolone Ligands |
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