Abstract: The charCO2 gasification reactivity in molten blast furnace slag was studied kinetically by the isothermal thermogravimetry using STA409PC thermal analyzer. The effects of the slagcoal ratio， gasification temperature and coal types on the gasification reaction were investigated through the calculation of relevant kinetic parameters according to the reaction rate equation method. The results showed that both the charCO2 conversion rate and the peak value of the reaction rate were positively correlated with the slagcoal ratio. The molten blast furnace slag had a certain promotion effect in the charCO2 gasification reaction. When the gasification temperature was lower than 1673K， the charCO2 conversion rate and the peak value of the gasification reaction rate both increased with the increase of the gasification temperature. When the gasification temperature was higher than 1673K， the carbon conversion rate and the peak value of the gasification reaction rate both appeared the tendency of decrease with the increase of the gasification temperature. The gasification reactivity with different types of coal char used differed from each other that the gasification reactivity of Datong coal was better than that of the Fuxin coal and even better than the coke. The dynamic parameters of the gasification reaction existed significant difference in different conditions. The apparent activation energy and preexponential factor of the coke increased with the increase of the slagcoal ratio; the apparent activation energy and preexponential factor of Fuxin coal increased first and then decreased with the increase of the slagcoal ratio.

Key words: coal char, gasification, kinetics, molten blast furnace slag, CO2