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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Rare Metal Extraction & Processing
Presentation Title Leaching of Neodymium from Recycled NdFeB Magnet Powders Using Citric Acid
Author(s) Srujan Rokkam, Quang Truong, Jonas Baltrusaitis, Manoj Silva
On-Site Speaker (Planned) Srujan Rokkam
Abstract Scope We report studies undertaken to recycle neodymium and dysprosium contained in NdFeB magnets from the End-of-Life electronics. The extraction process utilizes a two-stage process. The NdFeB powders go through wet ball mill grinding to pretreat with sodium hydroxide (NaOH) solution to form rare earth hydroxides. The rare earth hydroxides then go through leaching in mild acids. The leaching efficiencies of HCl and citric acid were investigated. As a result, a leaching efficiency of 69% for Nd and 100% for Dy was achieved after 60 minutes of milling with 3.5 mL of 4.0 M NaOH, and 60 minutes of leaching with 100 mL of 0.5 M citric acid into the solution phase. Subsequently, 100% of iron (Fe) content can be removed out of the solution. Finally, neodymium and dysprosium can be separated using multi-stage acid stripping. This work was funded by US DLA Phase I contract SP4701-19-P-0048, awarded to ACT, Inc.
Proceedings Inclusion? Planned:
Keywords Recycling and Secondary Recovery, Hydrometallurgy, Sustainability


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