A Method for Selective Recovery or Rare Earth Elements from ND-FE-B Magnet Scraps Based on Electrolysis
| Publication Number: | EP3795704C0 |
| Application Date: | 17. 9. 2019 |
| Assignee/Applicant: | Jožef Stefan Institute [SI] |
| Inventor: | Xu Xuan; Strum Saso; Zuzek Rozman Kristina |
| Title: | A Method for Selective Recovery or Rare Earth Elements from ND-FE-B Magnet Scraps Based on Electrolysis |
| Description: | The present invention relates to a method for recovery of rare-earth elements from Nd-Fe-B magnet scraps. In the method the Nd-Fe-B magnet scraps (2) are anodically oxidized in an electrochemical reactor (1) which at least comprises an anode formed of said Nd-Fe-B magnet scraps (2), a cathode and an aqueous liquid electrolyte (5). The aqueous liquid electrolyte (5) is selected such that during the anodic oxidation said Nd-Fe-B magnet scraps (2) are leached in the electrolyte (5) and Fe metal (7) is deposited on the cathode. After said anodic oxidation step Na2SO4 (12) is added to the electrolyte (5) to precipitate rare-earth elements. The electrolyte (5) is then filtered to recover the precipitated rare-earth elements in the form of (RE, Na)(SO4)2 double salts (13). |
| Drawings: |  |
| Category: | Nanotechnology and New Materials |
| Technology application codes: | Industrial manufacturing, material and transport, Other industrial technologies, Physical and exact sciences, |
| Market application codes: | Industrial products, Other |
| www: | https://worldwide.espacenet.com/patent/search/family/067988914/publication/EP3795704C0?q=pn%3DEP3795704A1 |
| Patent offices: | WIPO |
Extended patent application
| Publication Number: | CN112522527B |
| Application Date: | 17. 9. 2020 |
| Assignee/Applicant: | Jožef Stefan Institute [SI] |
| Inventor: | Xu Xuan; Strum Saso; Zuzek Rozman Kristina |
| Title: | A Method for Selective Recovery or Rare Earth Elements from ND-FE-B Magnet Scraps Based on Electrolysis |
| www: | https://worldwide.espacenet.com/patent/search/family/067988914/publication/CN112522527B?q=pn%3DEP3795704A1 |