Abstract: The kinetics during coalbased reduction of Fe2O3SiO2 system was studied isothermally and nonisothermally. The isothermal experiments showed that reduction degree and reduction rate increased with the rise of reduction temperature in a certain range， which was beneficial to the gasification of coal. The coalbased reduction reaction of Fe2O3SiO2 system accorded with AvramiErofeev kinetic model， and the reaction was controlled by the process of nucleation and development of iron particles. The apparent activation energy and preexponential of isothermal coalbased reduction process were 23533kJ/mol and 322×107min-1 respectively. The nonisothermal experiments showed that coalbased reduction reaction started at 400℃ and accelerated after 700℃ then reached equilibrium eventually. The apparent activation energy and preexponential of main reaction stage were 23866kJ/mol and 104×107min-1 determined by nonisothermal method.

Key words: coalbased reduction, Fe2O3SiO2 system, isothermal method, nonisothermal method, kinetics