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 involv...