Advertisement

REWAS 2019 pp 295-304 | Cite as

Rare Earth Magnet Recovery from Hard Drives by Preferential Degradation

  • Brandon OttEmail author
  • D. Erik Spiller
  • Patrick R. Taylor
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Neodymium recycling by the mineral processing practice of liberation and separation of hard disk drives is envisioned and evaluated. Magnetic material is liberated from the hard drive, constructed mostly of malleable metals, by preferential degradation of the brittle magnet material. The process developed is shown to recover greater than ninety-five percent of the magnet material with a product grade of over 80% magnet material by mass. The process is designed to co-produce stainless steel, aluminum, nickel alloy, carbon steel, and printed circuit board concentrates as contributors to the recycle value of hard drives.

Keywords

Recycling RE magnets Rare earths Neodymium 

Notes

Acknowledgements

This work was completed with support from the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office.

References

  1. 1.
    Office of Energy Efficiency and Renewable Energy (2010) U.S. department of energy—critical materials strategy. Department of Energy, Washington, DC, United StatesGoogle Scholar
  2. 2.
    Sprecher B, Kleijn R, Kramer G (2014) Recycling potential of neodymium: the case of computer hard disk drives. Environ Sci Technol 48(16):9506–9513CrossRefGoogle Scholar
  3. 3.
    Abrahami S, Xiao Y, Yang Y (2014) Rare-earth elements recovery from post-consumer hard-disc drives. Miner Process Extr Metall 124(2):106–115CrossRefGoogle Scholar
  4. 4.
    Takeda O, Okabe T, Umetsu Y (2006) Recovery of neodymium from a mixture of magnet scrap and other scrap. J Alloy Compd 408–412:387–390CrossRefGoogle Scholar
  5. 5.
    Baba K, Hiroshige Y, Nemoto T (2013) Rare-earth magnet recycling. Hitachi Rev 62(8):452–455Google Scholar
  6. 6.
    Bandara H, Darcy J, Apelian D, Emmert M (2014) Value analysis of neodymium content in shredder feed: toward enabling the feasibility of rare earth magnet recycling. Environ Sci Technol 48(12):6553–6560CrossRefGoogle Scholar
  7. 7.
    Walton A, Yi H, Rowson N, Speight J, Mann V, Sheridan R, Bradshaw A, Harris I, Williams A (2015) The use of hydrogen to separate and recycle neodymium–iron–boron-type magnets from electronic waste. J Clean Prod 104:236–241CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Brandon Ott
    • 1
    Email author
  • D. Erik Spiller
    • 1
  • Patrick R. Taylor
    • 1
  1. 1.Kroll Institute for Extractive MetallurgyColorado School of MinesGoldenUSA

Personalised recommendations