The oxidizing kinetics of the liquid FeO-MnO-CaO-SiO(2) slags in air has been studied in the temperature range of 1500 K to 1600 K (1227 A degrees C to 1327 A degrees C) by using a thermogravimetric analysis (TGA). The reaction products after oxidation were analyzed by X-ray diffraction analysis (XRD). The surface topography of the obtained samples was analyzed by scanning electron microscopy (SEM). The products after oxidation showed the presence of manganese ferrite/magnetite and calcium silicate for all the samples in the experimental temperatures range. The oxidation process was developed through the following three consequent steps: (1) incubation period followed by a chemical reaction controlled stage (2) and later (3) diffusion of oxygen through the product layer. Appropriate mathematical relationships were constructed for these steps. Combining equations corresponding to the mechanism of oxidation, the experimental results were consistently reproduced, validating thereby the theoretical analysis.
