Kinetics of hematite chlorination with Cl2 and Cl2 + O2. Part II. Chlorination with Cl2 + O2

The kinetics of chlorination of hematite by Cl2 + O2 have been investigated in the temperature range from 600 to 1025 °C by using thermogravimetric analysis (TGA). The effects of Cl2/O2 ratio, gas velocity, temperature and partial pressure of reactive gases on the reaction rate were determined. The reaction rate of Fe2O3 chlorination increased steadily with Cl2/O2 ratio reaching the maximum for the chlorination in absence of oxygen. The hematite chlorination process by Cl2 + O2 was characterized by an apparent activation energy of about 148 kJ/mol in the whole temperature range studied. The apparent reaction orders with respect to Cl2 + O2, Cl2 and O2 at 750 °C were about 0.71, 1.44, and −0.61, respectively. Almost the same values of reaction orders were obtained at 950 °C.