The present study investigates the silicothermic reduction kinetic and mechanism of the dolomitic charges used in the magnetherm type reactors under inert atmosphere. The dolomitic charges are composed of a mixture of calcined dolomite (dolime) and ferrosilicon pressed in the briquettes form. Initially, these briquettes were sintered under argon at different temperatures 700-1000 degrees C, then reduced in magnetherm reactor. Different technical parameters such as the effect of sintering temperature, the reduction temperature (1450-1550 degrees C) and reduction time (up to 20 min) were investigated. The produced slag was characterized using XRD, XRF, and SEM techniques. Maximum reduction extent (about 80%) was achieved at optimum reduction conditions. These optimum conditions were double stoichiometric amount of silicon (2x) which is necessary to reduce all magnesium oxide present in dolomitic charges, sintering temperature of 700 degrees C for1 hr, reduction time of 15 min and reduction temperature at 1550 degrees C. The results showed that the reduction of the dolomitic charge is controlled by the solid state diffusion process and the calculated value of the activation energy was found to be about 498 kj/mol. (C) 2013 Elsevier B.V. All rights reserved.