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To secure the supply chain for the productionNdFeB magnets of permanent magnetsPermanent magnets, recyclingRecycling rare earth elementsRare earth elements (REEs) from secondary sources, specifically end-of-life permanent magnetsPermanent magnets, has become a crucial area of research. The hydrometallurgical processing route has been determined as the best option, allowing elemental separation of the magnetMagnets components. Unfortunately, the electronegative metals in the magnetsMagnets and the fine particle size distribution of the shredded magnetsMagnets result in highly exothermic and uncontrollable reactions with significant hydrogen gas evolution. Therefore, this study presents an alternative processing method that replaces the mineral acids with a metal salt solution having higher a reduction potential while cementing the metal during the leachingLeaching process. Various metal salts are tested and investigated to enhance efficiency while eliminating the problems during conventional processing and considering the minimal environmental impact. The cemented metal is recycled during the process achieving a sustainable and environmentally friendly hydrometallurgical process for REE-bearing permanent magnetsPermanent magnets.

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Sustainable Hydrometallurgical Rare Earth Elements Recovery from Waste NdFeB Magnet

  • 会议论文

  • 发表日期：

    2025年

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  • Hüseyin Eren Obuz,
  • Bengi Yagmurlu

摘要

To secure the supply chain for the productionNdFeB magnets of permanent magnetsPermanent magnets, recyclingRecycling rare earth elementsRare earth elements (REEs) from secondary sources, specifically end-of-life permanent magnetsPermanent magnets, has become a crucial area of research. The hydrometallurgical processing route has been determined as the best option, allowing elemental separation of the magnetMagnets components. Unfortunately, the electronegative metals in the magnetsMagnets and the fine particle size distribution of the shredded magnetsMagnets result in highly exothermic and uncontrollable reactions with significant hydrogen gas evolution. Therefore, this study presents an alternative processing method that replaces the mineral acids with a metal salt solution having higher a reduction potential while cementing the metal during the leachingLeaching process. Various metal salts are tested and investigated to enhance efficiency while eliminating the problems during conventional processing and considering the minimal environmental impact. The cemented metal is recycled during the process achieving a sustainable and environmentally friendly hydrometallurgical process for REE-bearing permanent magnetsPermanent magnets.