Reduction of Iron-Silicon-Oxysulfide by CO Gas Injection

The reduction of liquid oxysulfide in the Fe-Si-S-O system by CO gas injection has been studied by monitoring the exit gas composition. The reduction rate of oxygen was calculated from the volume of evolved CO2. Sulfur-bearing species such as COS were close to the detection limit of the mass spectrometer, which indicated that the reduction of sulfur was very limited. The volume of evolved CO2 reached steady values I minute after CO injection. The reduction reaction was controlled by a chemical reaction. The observed maximum reduction rate of oxygen at 1250 °C was 8.3 X 10^-6 gO/cm^2 s, which was within the range of the reduction rates in other melts such as iron oxide and iron silicates.