The transition to a circular economy is crucial for sustainable resource management. This study involves an integrated approach for the valorization of end-of-life (EoL) neodymium–iron–boron (NdFeB) magnets, combining a one-pot metal leaching by bio-based chemicals and selective Ln-precipitation, with a hydrothermal carbonization (HTC) to recover the Fe- and C-rich aqueous fraction, in the form of a magnetic hydrochar. This innovative approach enhances metal recovery while producing functional carbon materials, contributing to scalable, eco-friendly recycling solutions for environmental remediation and resource valorization.
From end-of-life magnets to functional carbon materials: a circular strategy for resource recovery
Gianluigi Farru;Anna Laura Sanna;Maria Lisac Palomo;Silvia Roman Suero;Giovanna Cappai;Angela Serpe
2025-01-01
Abstract
The transition to a circular economy is crucial for sustainable resource management. This study involves an integrated approach for the valorization of end-of-life (EoL) neodymium–iron–boron (NdFeB) magnets, combining a one-pot metal leaching by bio-based chemicals and selective Ln-precipitation, with a hydrothermal carbonization (HTC) to recover the Fe- and C-rich aqueous fraction, in the form of a magnetic hydrochar. This innovative approach enhances metal recovery while producing functional carbon materials, contributing to scalable, eco-friendly recycling solutions for environmental remediation and resource valorization.
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