Single Step Ironmaking from Ore to Impro

Current blast furnace technology is a two-stage ironmaking process that demands energy-intensive heating and cooling of iron ore concentrates to produce pig iron. The objective of this project was to assess the ITmk3 process, which aims to produce pig iron nuggets directly from cold-pelletized iron ore concentrates in a single heating stage. Utilizing a rotary-hearth furnace, the study examined the transformation of powdered iron oxide to metal and slag while varying temperature and processing time. Results demonstrated that the initially presumed direct reaction of iron oxides with coal was inaccurate. Instead, coal volatiles first reacted with iron oxides to form Direct Reduced Iron (DRI), and subsequent melting produced a mixed slag/metal product termed Transition Direct Reduced Iron (TDRI). Eventually, TDRI separated into pig iron and slag. The optimal transformation time significantly varied with temperature, suggesting an essential relationship for industrial-scale applications. Inconsistencies in nugget quality were attributed to non-uniform heating of pellets within the furnace, indicating that achieving uniform heating is crucial for consistently producing high-quality pig iron nuggets.