Kinetics of hematite chlorination with Cl(2) and Cl(2) + O(2). Part II. Chlorination with Cl(2) + O(2)

The kinetics of chlorination of hematite by Cl(2) +O(2) have been investigated in the temperature range from 600 to 1025 degrees C by using thermogravimetric analysis (TGA). The effects of Cl(2)/O(2) ratio, gas velocity, temperature and partial pressure of reactive gases on the reaction rate were determined.

The reaction rate of Fe(2)O(3) chlorination increased steadily with Cl(2)/O(2) ratio reaching the maximum for the chlorination in absence of oxygen. The hematite chlorination process by Cl(2) + O(2) 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 Cl(2) + O(2), Cl(2) and O(2) at 750 degrees C were about 0.71, 1.44, and -0.61, respectively. Almost the same values of reaction orders were obtained at 950 degrees C.