Recycling of NdFeB Magnets Using Sulfation, Selective Roasting, and Water Leaching

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• 作者：Mehmet Ali Recai ?nal ; Chenna Rao Borra ; Muxing Guo…
• 关键词：Recycling ; NdFeB magnets ; Sulfation ; Roasting ; Water leaching
• 刊名：Journal of Sustainable Metallurgy
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：1
• 期：3
• 页码：199-215
• 全文大小：7620KB
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• 作者单位：Mehmet Ali Recai ?nal (1)
  Chenna Rao Borra (2)
  Muxing Guo (1)
  Bart Blanpain (1)
  Tom Van Gerven (2)
  
  1. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, 3001, Leuven, Belgium
  2. Process Engineering for Sustainable Systems (ProcESS), Department of Chemical Engineering, KU Leuven, De Croylaan 46, 3001, Leuven, Belgium
  
• 刊物类别：Metallic Materials; Sustainable Development; Industrial Chemistry/Chemical Engineering;
• 刊物主题：Metallic Materials; Sustainable Development; Industrial Chemistry/Chemical Engineering;
• 出版者：Springer International Publishing
• ISSN：2199-3831

文摘

NdFeB magnets currently dominate the magnet market. Supply risks of certain rare earth metals (REMs), e.g., Nd and Dy, demand efficient recycling options that are applicable to different types and compositions with minimum use of chemicals and waste generation. In this study, a hydrometallurgical method is presented, which is adjustable to all NdFeB magnets, regardless of their composition. After completely transforming powdered samples into a sulfate mixture, a suitable selective roasting and water leaching treatment resulted in 95-00 % extraction efficiencies for Nd, Dy, Pr, Gd, Tb, and Eu, while Fe remained in the resultant residue forming a marketable hematite-dominated by-product. Impurities other than Fe were also greatly separated from the leachate thereby enabling the production of a liquid with at least 98 % REM purity. Such a solution then can be directly treated with subsequent shortened downstream processes without pretreatments for impurity removal. Due to decomposition reactions of impurities, including Fe, during the selective roasting stage, the majority of consumed acid is recyclable resulting in an environment-friendly flow sheet. Keywords Recycling NdFeB magnets Sulfation Roasting Water leaching