One-step separation of neodymium and dysprosium without using organic solvents.
Green (Saitama University Research Seed Collection 2025-25 p.100)
Keywords: Neodymium, Dysprosium, Separation, Low Environmental Impact, Coordination Polymers
Neodymium (Nd) magnets containing dysprosium (Dy) are high-performance magnets that enable energy-saving technologies such as motors. As the need to recycle Nd and Dy from used products increases in order to boost domestic self-sufficiency in the future, it is crucial to efficiently separate the components within the magnets. Traditional separation methods, such as solvent extraction, have the drawback of using large amounts of organic solvents. If Nd and Dy can be efficiently separated and recovered using only water as a solvent, it could become a superior separation method in terms of lower environmental impact compared to conventional methods. This research discovered that by utilizing coordination polymerization reactions, Nd and Dy can be precipitated and separated in one step using only water as the solvent. This study demonstrates that by incorporating organic ligands into the traditionally inorganic salt-based precipitation separation, the separation efficiency of Nd and Dy can be improved.
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Yuko Handa, Associate Professor Graduate School of Science and Engineering, Department of Materials Science, Fundamental Materials Area 【Recent Research Themes】 ● Development of rare earth separation methods utilizing the crystal structure changes of coordination polymers ● Synthesis and functional exploration of coordination polymers using nucleic acids (DNA, RNA) ● Elucidation of the adsorption mechanisms of substances on ice surfaces
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【Appeal Points to the Industry】 ● Patent obtained (Patent No. 6411199 for "Aqueous Separation Precipitation Method for Rare Metals Utilizing Coordination Polymers") ● If the design and synthesis of new organic ligands are possible, further separation efficiency can be achieved. 【Examples of Practical Use, Applications, and Utilization】 ● Mutual separation of rare earths without the use of organic solvents.
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Changes in the precipitation rates of Nd3+ and Dy3+ with respect to organic ligand concentration.
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.