The accurate measurement of solid-solid reaction kinetics

such as reduction of iron oxide by carbon

is of great significance in scientific research and practical applications.In this paper solid-solid reaction characteristics between iron oxide and graphite was studied using thermogravimeter (TG) measurement for both samples prepared respectively by directly mixing and grinding graphite and Fe2O3 as well as by impregnating Fe2O3 on the graphite.Their reaction kinetic parameters were calculated using the Flynn-Wall-Ozawa and Coats-Redfern equations.The variation trends of activation energy are related with the aggregation morphology of Fe2O3 on the surface of carbon.The reduction kinetics for impregnated sample is of the characteristics of strong endothermic reaction.Combining the results of XRD characterization and online gas determination

in the initial stage of Fe2O3 reduction the products are Fe3O4 and CO2

reaction follows second order reaction mechanism and activation energy is about 530 kJ·mol-1.