Patent Profile
| Patent No: | IN519997 [India] | Application No: | 201911037730 |
| Title: | An improved process for selective recovery of rare earths from NDFEB magnet | ||
| Issue Date: | 05-03-2024 | File Date: | 19-09-2019 |
| Inventor(s): | Aarti Kumari ; Navneet Singh Randhawa ; Sushanta Kumar Sahu | ||
| IPC Classification: | H01F1/05, C22B59/00, C22B7/00, H01F41/02, C22C33/02 | ||
| Abstract: | The present invention relates to a process for the recovery of valuable metal compounds from spent neodymium-iron-boron magnets of wind turbines. The chloridizing roasting followed by water leaching method has been applied for selective recovery of rare earths from waste NdFeB magnet. In the present invention, NH4CI is used as additive for chloridizing roasting process. In the applied method, rare earths selectively recovered by roasting the magnet powder at much lower roasting temperature and also, avoided the usage of concentrated acids in leaching process. The method is useful to produce mixed rare earth oxide of Neodymium, Praseodymium and Dysprosium of 99% purity from the leach liquor. The invention is also useful for the recovery of iron oxide powder which has large Application and high market value. | ||
CSIR-National Metallurgical Laboratory[CSIR-NML]
: director[at]nmlindia[dot]org
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:https://www.nml.res.in
: director[at]nmlindia[dot]org
:91-657-2345202
:https://www.nml.res.in
Industrial Applications
Metal Recyling [Metallurgy]
Pollution control [Environmental (Clean Tech)]
Waste management [Environmental (Clean Tech)]