| Effect of Ash Component in Platy Coke on Melting Behavior of Iron Taichi Murakami1; Daisuke Maruoka2; Eiki Kasai1; 1GRADUATE SCHOOL OF ENVIRONMENTAL STUDIES, TOHOKU UNIVERSITY, Sendai, Japan; 2TOHOKU UNIVERSITY, Sendai, Japan; PAPER: 22/Iron/Regular (Oral) SCHEDULED: 14:00/Tue. 29 Nov. 2022/Arcadia 1 ABSTRACT: Saving carbon dioxide emission is essential to produce environmentally friendly steel especially, decreasing its amount from blast furnace process is important. Not only faster reduction of iron ore but also the acceleration of carburizing and melting of reduced iron is the method to achieve it. Understanding ash behavior in coke is important to control carburization. In this study, concentration behavior in ash compounds on the surface of coke by gasification under blast furnace condition and melting behavior of iron tablet by the direct contact with coke were examined. Furthermore, in-situ observations of melting behavior of coke-iron composite and effect of de-ash treatment was carried out. Ash concentrates on the surface of coke by gasification, and the coverage ratio of ash on the coke surface increases with increasing coke reactivity. Melting of iron by carburization from coke proceeds at lower temperature when coke reactivity is high. However, the effect of ash coverage ratio on this behavior is much higher than that of coke reactivity and an increase in ash coverage ratio leads to preventing carburization and melting of iron. SiO2 in ash reduces to Si by carbon, and it alloys with metallic iron. It can be concluded that Si prevent to melt iron. |
