Abstract
The objective of this study is to separate dyes in wastewater with high efficiency and speed using high-gradient magnetic separation via a superconducting bulk magnet. Two main technologies are necessary for this magnetic separation: one is a magnetic-seeding technology that provides the substance with ferromagnetism, and the other is a magnetic-separation technology that uses a superconducting magnet and magnetic filters. In order to separate the organic dyes, it is necessary to clarify the mechanism of magnetic seeding, and to design a suitable magnetic-seeding method for each kind of dye. Six kinds of dyes widely used in industry were used to investigate the possibility of magnetic seeding, and the interaction mechanism between the dyes and ferromagnetic particles. The results show that electrostatic interaction was one of the main interactions between the organic dyes and ferromagnetic particles. Based on the results, the possibility of practical application of the continuous magnetic separation systems was examined in a model experiment using a superconducting bulk magnet.
