자철광의 환원 속도에 미치는 외부 자기장의 영향 연구

Abstract

The reduction behavior of magnetite by hydrogen and H2-CO gas mixtures with applied magnetic field was investigated. Metallization of magnetite under Curie temperature with different external magnetic field strength and H2/CO gas ratio were investigated by thermo gravimetric analysis, TGA. The reduction rate increased with external magnetic field and hydrogen gas atmosphere. There was no wustite formation at below Curie temperature of magnetite. In order to find out external magnetic field effect on reduction of magnetite, two type of magnetite were utilized, pellet and powder. When powdered sample of magnetite were used, it was possible to observe enhancements of the reduction rate. Because the particles in the presence of an external magnetic field had highly exposed surface area to the reduction gas. In addition, the effect of reduction temperature, reducing agents, ore types, particle size, and specimen shape on the metallization behavior of magnetite below the Curie temperature with different external magnetic field strengths were investigated visually. The elemental distribution in the reduced magnetite were clarified using the BET, XRD, SEM, and EPMA method.