Decarburization Kinetics of Fe–C Melt with CO<sub>2</sub>–O<sub>2</sub> Mixed Gas by Isotope Tracing Method

The partial substitution of O2 with CO2 in steelmaking process is an important technology to reduce emission and recycle. In order improve CO2–O2 decarburization utilization, the kinetics Fe–C melt mixed gas have been studied using 13CO2–18O2 dual isotope tracing method established kinetic model. results show that less than 40% oxygen partially replaced by CO2, which improves utilization involved reaction still more 80%. For rate limiting steps, regarding O2, it governed control mechanism involving gas-phase mass transfer interfacial chemical reaction; increase pressure, step changes from only. As bath temperature 1723 1873 K, overall increases; mainly affects rates, whereas, rates are not significantly affected. apparent activation energy 21.5 kJ·mol−1.