1992 年 32 巻 4 号 p. 489-495
The oxidation kinetics was studied thermogravimetrically with three kinds of cement-bonded natural ilmenite pellets. Appreciable temperature rise was found inside the pellets during their oxidation with pure oxygen. In order to suppress the temperature rise, a series of oxidation experiments was carried out with diluted oxygen (9.8mol%O2-N2) in the temperature range from 1073 to 1273 K. The experimental data were analyzed in the light of the unreacted core shrinking model resulting in that the oxidation rate was mainly controlled by the intrapellet diffusion of oxygen and the intrinsic chemical reaction. The temperature dependence of the kinetic parameters was also determined.
