| Autor: |
Lima, Suzan X., Neves, Eduardo F., Rosa, Marcelo A., da Silva, Douglas A. P., Ronchi, Julio C. S., Wendhausen, Paulo A. P., Neto, Joao B. R., Souza, Sergio M., Rebelo, Querem H. F., Junior, Pedro O. N., Souza, Ricardo D. |
| Zdroj: |
IEEE Transactions on Magnetics; September 2024, Vol. 60 Issue: 9 p1-4, 4p |
| Abstrakt: |
Recycling end-of-life (EoL) magnets is a necessary strategy to mitigate environmental impacts in magnet production and rare-earth extraction. Utilizing these waste materials as raw materials in magnet production means advancement in the economy and sustainability gains. In this work, the reduction-diffusion (RD) was adopted to recover highly oxidized and corroded EoL magnets, which are generally disposed in more traditional recycling routes. The EoL magnets with 57800 ppm of O were demagnetized, and the corroded portion was sieved (opening $\lt 500~\mu $ m) and characterized by X-ray diffraction (XRD), and the results show the presence of $\Phi $ -phase (Nd2Fe14B) and rare-earth oxides dissociated from $\Phi $ -phase in the powder, which indicate that this material is suitable to be recovered; however, the presence of $\alpha $ -Fe was observed in some process conditions. The results obtained after RD process show coercivity above 800 kA/m and $\Phi $ -phase particles with diameter under $2~\mu $ m and absence of $\alpha $ -Fe. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
