Comparison of production of mixed rare earth oxide (Nd/Pr oxide) powders by different precipitation agents from NdFeB magnets’ water leaching

Elif Emil-Kaya*, Emircan Uysal, Sebahattin Gürmen, Bernd Friedrich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This research compared the production processes for mixed rare earth oxide (Nd/Pr oxide) powders from a leach solution obtained from acid baking with nitric acid followed by water leaching. Furthermore, the precipitation behaviour of the constituent elements in the leach liquor was examined. Development of economically feasible processes is significant on an industrial scale. In this regard, Nd/Pr oxide powders were recovered from the leach solution by using oxalic acid, ammonium oxalic acid (C2H2O4), sodium hydroxide (NaOH), and ammonium hydrogen carbonate (NH4HCO3) in a comparative manner. Experimental investigations showed behavioural similarities between C2H2O4 and NH4HCO3 precipitation agents; they precipitate rare earth elements (REEs), selectively. However, NaOH was different from them as it precipitates constituent elements in the leach liquor. The cost of C2H2O4 and NH4HCO3 on the industrial scale is higher than NaOH. The resulting flow diagrams of the preparation of Nd/Pr oxide powders were comprehensively compared and optimised to propose more environmentally friendly, economical, and sustainable process.

Original languageEnglish
JournalCanadian Metallurgical Quarterly
DOIs
Publication statusAccepted/In press - 2023

Bibliographical note

Publisher Copyright:
© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

Keywords

  • acid baking
  • hydrometallurgy
  • NdFeB
  • precipitation
  • rare earth oxide
  • recovery
  • recycling
  • water leaching

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