| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recycling and Sustainability for Emerging Technologies and Strategic Materials
|
| Presentation Title |
Rare Earth Magnet or Ferroalloy? What Steel Processing Can Teach Us about Magnet Sludge Recycling. |
| Author(s) |
Mary Elizabeth Wagner, Antoine Allanore |
| On-Site Speaker (Planned) |
Mary Elizabeth Wagner |
| Abstract Scope |
Recycling rare-earth magnets poses a metallurgical challenge due to their high reactivity and the difficulty in separating individual rare-earth elements. These challenges are compounded when considering magnet machining sludge, which is more heavily oxidized and contaminated than typical end-of-life magnets. Drawing inspiration from steel processing, a thermodynamic study was undertaken to consider the oxidation behavior of rare-earth magnet sludge using a hybrid CALPHAD-classical method and a comprehensive 25 element model. Oxygen distribution in a rare-earth magnet, with a total O content ranging between 0.09% to 5.4wt%, was assessed. The theoretical minimum energy to reduce the whole magnet sludge, without separation and purification, was calculated. The model performance with respect to published experimental data is used to shed light into new possible processing methods for magnet recycling. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Recycling and Secondary Recovery, Computational Materials Science & Engineering, Sustainability |