Abstract
Here we study the recovery process of rare earth metals from Nd magnet scraps via electrolysis in a molten salt and with an alloy diaphragm. In the present study, the electrochemical formation of Dy-Fe and Nd-Fe alloys, which was an important step of the recovery process, was investigated in molten CaCl2-LiCl systems at 873 K. Two Dy-Fe alloy samples were prepared by potentiostatic electrolysis of Fe plate electrodes at 0.30 V (vs. Li+/Li) and 0.50 V for 1 h in CaCl2-LiCl-DyCl3 (0.50 mol% added). The formation of DyFe5 was suggested by X-ray diffraction (XRD). Potentiostatic electrolysis was also conducted at 0.30 V and 0.50 V for 1 h using Fe plate electrodes in CaCl2-LiCl-NdCl3 (0.50 mol% added). XRD analysis suggested the formation of Nd2Fe17 for both samples. The equilibrium potentials for (DyFe5+Fe) and (Nd2Fe17+Fe) coexisting phases were indicated.
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