en Research Paper Research Paper Abstract: In this paper solid state reduction of high carbon ferrochromium-chromite composite pellets in the temperature range of 900-1350°C was investigated. A two stage reduction mechanism is proposed. The first stage is likely to be controlled by the chemical reaction with activation energy of 127.2kJ/mol. In the second stage, solid state diffusion of carbon through the reaction product layer is suggested to be rate controlling. The activation energy of this stage was calculated to be 93.1kJ/mol. The reduction process was found to be favored by high temperatures as well as high vacuum. The results also show that pre-milling of initial mixture has a negative effect on the reduction degree. Reaction Kinetics, Solid State Reduction, Ferrochromium, Activation Energy. 22 28 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3-18&slc_lang=en&sid=1 A. Ataie1, 18003194753284600331 18003194753284600331 No S. Heshmati-Manesh1, 18003194753284600332 18003194753284600332 No S. Sheibani1, Sheibani_s@engmail.ut.ac.ir 18003194753284600333 18003194753284600333 Yes G. R. Khayati,Y. Firozbakht 18003194753284600334 18003194753284600334 No