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The kinetics of MnO and SiO2 reduction in SiMn slags based on Assmang / Comilog ore and high-carbon ferromanganese (HCFeMn) slag were investigated between 1500 and 1650°C under CO atmosphere. The results showed that charges containing HCFeMn slag had relatively faster reduction rates than the charges without. The difference in the driving force for MnO reduction was insignificant between the SiMn slags at 1500°C, which implied a low contribution of the driving force for reduction rate. The comparison of slag viscosities was also rather similar at 1500°C, which could not explain the different reduction rates. Different charges will contain various sulfur contents, and it is believed that this is the main source of variation in the reduction rates. The estimated activation energies for MnO reduction were around 500–920 kJ/mol for charges containing HCFeMn slag and between 250–300 kJ/mol without. Based on the estimated kinetic parameters, the considered rate models were able to describe the reduction of MnO and SiO2 in SiMn slags between 1500 and 1650°C.

Reduction rates of MnO and SiO2 in SiMn slags between 1500 and 1650°C