Acetic acid leaching of neodymium magnets and iron separation by simple oxidative precipitation
Niskanen, J., Lahtinen, M., & Perämäki, S. (2022). Acetic acid leaching of neodymium magnets and iron separation by simple oxidative precipitation. Cleaner Engineering and Technology, 10, Article 100544. https://doi.org/10.1016/j.clet.2022.100544
Julkaistu sarjassa
Cleaner Engineering and TechnologyPäivämäärä
2022Oppiaine
Epäorgaaninen kemiaAnalyyttinen kemiaEpäorgaaninen ja analyyttinen kemiaResurssiviisausyhteisöInorganic ChemistryAnalytical ChemistryInorganic and Analytical ChemistrySchool of Resource WisdomTekijänoikeudet
© 2022 the Authors
Neodymium-iron-boron (NdFeB) has become the most prominent permanent magnet alloy, with a wide variety of applications and an ever-increasing demand. Their recycling is important for securing the supply of critical raw materials used in their manufacturing. The use of organic acids such as acetic acid has been of recent interest for the recycling of waste NdFeB magnets. Despite achieving good leaching efficiencies, the published literature has not properly investigated the effects of key factors influencing the acetic acid leaching process and their respective interactions, which has lead to conflicting findings as to what conditions are optimal. The present work goes to show that no such optimum actually exists by taking a look at the major factors (concentration, solid-to-liquid ratio, time and temperature) and their interactions. The results show that leaching efficiencies >95% and even up to 100% can be achieved using a variety of different conditions showing that the leaching reaction is quite flexible, which is helpful for a potential upscaling of the process. Separation of the leached elements presents another problem in NdFeB magnet processing. As a novel application, this work investigated iron separation from the acetic acid leachate by the means of simple and inexpensive aeration. It was found that up to 99% of iron could be precipitated as FeO(OH) (goethite) within 2 h at pH 5 and 80 °C, while only minor neodymium co-precipitation was observed (5%). Separation of iron from the leachate can help obtain purer REE products in further processing.
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Julkaisija
Elsevier BVISSN Hae Julkaisufoorumista
2666-7908Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/151751487
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EAKR Euroopan aluekehitysrahasto, React-EULisätietoja rahoituksesta
The work was supported by the Department of Chemistry at University of Jyväskylä, and the experimental work received funding from the European Regional Development Fund (grant number: A76928). Hannu Salo is gratefully acknowledged for SEM-EDS imaging and analysis. Green Disposal Oy, Ltd is acknowledged for providing the waste NdFeB magnets.Lisenssi
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