Abstract
Experiments have been made of the reduction of synthetic FeCr2O4 pellet with hydrogen in a temperature range from 800°C to 1 300°C. The reduction of FeO component preceded that of Cr2O3, and it proceeded topochemically under the formation of relatively clear interface between reduced shell (γ-Fe+Cr2O3) and unreacted core. In the reduction stage of Cr2O3 component, the reaction interface was considerably widely. diffused. Kinetic analysis based on an unreacted core model was conducted with the reduction stage of FeO component, and the rate constant of chemical reaction kr and the intraparticle diffusivity De were evaluated. The activation energy of the chemical reaction was about 30 kcal/mol. The temperature-dependency of De was very strong, especially at temperatures above 1 200°C.
