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Processing of Grinding Slurries Arising from NdFeB Magnet Production
Author(s) -
Kruse Stephanie,
Raulf Karoline,
Trentmann Anna,
Pretz Thomas,
Friedrich Bernd
Publication year - 2015
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201500070
Subject(s) - neodymium magnet , dysprosium , grinding , neodymium , metallurgy , materials science , slurry , praseodymium , rare earth , magnet , raw material , alloy , chemistry , composite material , mechanical engineering , inorganic chemistry , laser , physics , optics , organic chemistry , engineering
Neodymium‐iron‐boron (NdFeB) grinding slurries are the residual output of grinding as shaping process step in the production process of sintered NdFeB magnets. The treatment of the grinding slurries with the aim of recovering rare earth elements may lead to a reduced demand in primary raw materials like the rare earth elements neodymium, praseodymium and dysprosium. In this study, the possibility of recycling the contained rare earth elements, which account for up to 30 wt % in the alloy, through a pyrometallurgical process was investigated. The necessity of a thermal conditioning prior to the pyrometallurgical process is described.