Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process

Abstract There is considerable interest in extraction of rare earth elements from NdFeB magnets to enable recycling of these elements. In practical extraction methods using wet processes, the acid waste solution discharge is a problem that must be resolved to reduce the environmental impact of the p...

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Autores principales:	Jiro Kitagawa, Ryohei Uemura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3d78a6651ce8431396ca17c6400b2356
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spelling	oai:doaj.org-article:3d78a6651ce8431396ca17c6400b23562021-12-02T12:31:52ZRare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process10.1038/s41598-017-08629-z2045-2322https://doaj.org/article/3d78a6651ce8431396ca17c6400b23562017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08629-zhttps://doaj.org/toc/2045-2322Abstract There is considerable interest in extraction of rare earth elements from NdFeB magnets to enable recycling of these elements. In practical extraction methods using wet processes, the acid waste solution discharge is a problem that must be resolved to reduce the environmental impact of the process. Here, we present an encouraging demonstration of rare earth element extraction from a NdFeB magnet using a closed-loop hydrochloric acid (HCl)-based process. The extraction method is based on corrosion of the magnet in a pretreatment stage and a subsequent ionic liquid technique for Fe extraction from the HCl solution. The rare earth elements are then precipitated using oxalic acid. Triple extraction has been conducted and the recovery ratio of the rare earth elements from the solution is approximately 50% for each extraction process, as compared to almost 100% recovery when using a one-shot extraction process without the ionic liquid but with sufficient oxalic acid. Despite its reduced extraction efficiency, the proposed method with its small number of procedures at almost room temperature is still highly advantageous in terms of both cost and environmental friendliness. This study represents an initial step towards realization of a closed-loop acid process for recycling of rare earth elements.Jiro KitagawaRyohei UemuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-6 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jiro Kitagawa Ryohei Uemura Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process
description	Abstract There is considerable interest in extraction of rare earth elements from NdFeB magnets to enable recycling of these elements. In practical extraction methods using wet processes, the acid waste solution discharge is a problem that must be resolved to reduce the environmental impact of the process. Here, we present an encouraging demonstration of rare earth element extraction from a NdFeB magnet using a closed-loop hydrochloric acid (HCl)-based process. The extraction method is based on corrosion of the magnet in a pretreatment stage and a subsequent ionic liquid technique for Fe extraction from the HCl solution. The rare earth elements are then precipitated using oxalic acid. Triple extraction has been conducted and the recovery ratio of the rare earth elements from the solution is approximately 50% for each extraction process, as compared to almost 100% recovery when using a one-shot extraction process without the ionic liquid but with sufficient oxalic acid. Despite its reduced extraction efficiency, the proposed method with its small number of procedures at almost room temperature is still highly advantageous in terms of both cost and environmental friendliness. This study represents an initial step towards realization of a closed-loop acid process for recycling of rare earth elements.
format	article
author	Jiro Kitagawa Ryohei Uemura
author_facet	Jiro Kitagawa Ryohei Uemura
author_sort	Jiro Kitagawa
title	Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process
title_short	Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process
title_full	Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process
title_fullStr	Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process
title_full_unstemmed	Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process
title_sort	rare earth extraction from ndfeb magnet using a closed-loop acid process
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3d78a6651ce8431396ca17c6400b2356
work_keys_str_mv	AT jirokitagawa rareearthextractionfromndfebmagnetusingaclosedloopacidprocess AT ryoheiuemura rareearthextractionfromndfebmagnetusingaclosedloopacidprocess
_version_	1718394209291993088

Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process

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