Efficient Utilization of Carbon-Bearing Dusts in Composite Agglomeration Process for Iron Ore Sintering

Abstract

This study focused on improving recycling of carbon-bearing dusts from integrated steel plants by the composite agglomeration process (CAP), in which four types of the dusts were prepared as pelletized feed, while the other raw materials were used as matrix feed for sintering to produce agglomeration product as a substitute for traditional iron ore sinter. It was found that the carbon distribution in the pelletized feed and matrix feed and segregation of pelletized feed in the burden layer strongly affected the process. When the total carbon content of the feeds was 3.22 wt%, the proper carbon content ratio of pelletized feed to matrix feed was 1.65-2.48. At this moment, optimizing the segregation of pelletized feed which contained 6.64 wt% carbon (named DP-4) in the sintering burden layer would improve the quality indexes of agglomeration product with higher carbon utilization efficiency, i.e., lower total carbon consumption.