Abstract
To effectively separate the organic dyes in wastewater, we propose a method magnetic separation using superconducting bulk magnets. There are two key technologies in the magnetic separation process; magnetic seeding and magnetic separation. Two kinds of magnetic particles, magnetic activated carbon (MAC) and reactive nanoscale iron particles (RNIP), were used to adsorb organic dyes, orange II and crystal violet, as magnetic seeds. We set up a magnetic separator by placing an acrylic pipe between the magnetic poles of a face-to-face superconducting bulk magnet, and two types of magnetic separation were carried out: high gradient magnetic separation (HGMS) and open gradient magnetic separation (OGMS). The experimental results showed us that the adsorption ratio reached 93% and 97% for MAC and RNIP, respectively, and separation ratios of over 90% were achieved in HGMS both for the organic dyes.
