European Direct Reduced Iron and Alternative Ironmaking Conference - IRONMASTERS 2022

Many researches on the reduction of carbon-iron ore composite have been reported to decrease carbon dioxide emission from ironmaking process. There are many types of carbonaceous materials such as coke, dust, coal, and biomass char. Some of them have a certain amount of sulfur which affects the reduction behavior. In this study, effect of sulfur contents, its form, and CaO addition on the carburization and melting of reduced iron of carbon-iron ore composite was evaluated. Carbon content in the reduced iron decreases with increasing sulfur content because the direct contact of carbon to reduced iron through molten slag prevents by decreasing surface tension of slag due to increasing sulfur content in slag. The inhibiting effect of sulfur added by FeS is stronger than that by elemental sulfur to the composite. There is optimum amount of CaO addition to promote the carburization and melting.