Zhang Jianfeng, Tanjedrew Narisara, Wenzel Marco, Royla Philipp, Du Hao, Kiatisevi Supavadee, Lindoy Leonard F, Weigand Jan J
Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand.
Angew Chem Int Ed Engl. 2023 Mar 20;62(13):e202216011. doi: 10.1002/anie.202216011. Epub 2023 Jan 31.
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 Ca , Mg , 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 Mg and Ca 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.
确保锂的持续和可持续供应需要开发高效的分离工艺，如用于原生资源和某些废物流的液液萃取（LLE）。在这项工作中，4-磷酰基吡唑啉酮用于在pH值受控的情况下从钙、镁、钠和钾中高效分步分离锂。系统研究了影响液液萃取过程的因素，如萃取剂的取代模式、稀释剂/水的分布、共配体、pH值以及所涉及金属配合物的形态。当镁和钙在pH<5.0时预先分离，在pH 6.0时锂的最大萃取效率为94%，这证明通过简单调节水相的pH值就可以分离这些离子。我们的研究为从酸性卤水或废旧锂离子电池浸出液中分离锂指明了一条道路，这有助于以更环保和可持续的方式保障未来锂的供应。
