The kinetics of hematite (Fe2O3) to wustite (FeO) reduction has been investigated. Kinetic parameters have been estimated based on the thermogravimetric data. The Avrarrii-Erofe'ev equation of coupled nucleation and growth processes was successfully applied to describe the initial stages of the process, while four diffusion equations were tested to model the final stages of the process. It was found that the initial stage can be interpreted theoretically as the crystals' nucleation and 1D growth at the gas/iron oxide(s) interface, which gradually shifts to diffusion control. Kinetic and diffusion regions for various temperatures (within the 700-900 degrees C range) were identified. The value of activation energy AEa of the reaction was estimated and compared with the literature data. (c) 2007 Elsevier B.V. All rights reserved.