EARTH

[3901-12-07] Neodymium Resources Recycling from Spent Magnets Slurry

○Chen-Yao Hung¹, Wei-Sheng Chen¹ (1. National Cheng Kung University )

Chairman: Kyoungkeun Yoo （Korea Maritime and Ocean University）, Naoki Hiroyoshi (Hokkaido University)

Keywords:solvent extraction, Nd, slurry, synergetic

Since permanent magnet, the demand of permanent increase year by year. Permanent magnet have applied in multiple area, like wind turbine, magnetic resonance imaging (MRI), DVD players and voice coil motor (VCM). In Taiwan, the process of VCM product over 10 tons of Nd-contained slurry per year without suitable treatment. In this study, the analysis of raw material by ICP contained 24.5 wt% Nd, 71.5% Fe, 1% B. After leaching process, we will discuss the initial pH value, extractant, organic-aqua ratio and extractant concentration to get the optimal parameters to separate Fe and Nd. Next, the stripping process discuss the type of stripping agent and the concentration. In the last step, the purification process will be investigated. Using oxalic acid to obtain oxalic neodymium and after calcination process to get neodymium oxide. Finally, we could obtain over 90% recovery rate of Nd.