Abstract
Physical and electrochemical properties of choline-based ionic liquids were investigated in this research. The result showed that the electrical conductivity was dependent on the density of ionic liquids. In addition, it was revealed that RE metallic species affected for the ionic conductive mechanism. Furthermore, the recycling process of RE metals from Nd-Fe-B permanent magnets by electrodeposition using ionic liquids was developed. In this study, VCM was used as the starting materials and each treatment of recycling processes, which consisted of the following processes, i.e., demagnetization, chemical etching, dissolution in amide-acid, synthesis of metallic-salts and two-stage electrodeposition, has been applied to the practical wastes. The electrodeposits obtained in electrodeposition(I) and (II) using choline-based ionic liquids were examined by SEM/EDX and XPS. The results proved that iron group and rare earth metals can be recovered separately by electrodeposition(I) and (II), respectively.
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