The reduction of iron oxides has been investigated extensively, mainly by virtue of its industrial significance. Nevertheless, despite the large amount of experimental evidence, there has been as yet no agreement as to the mechanism of the reaction, nor has a generalized correlation for the reaction rate been suggested. As a matter of fact, many workers appear to assume that the complexity of the system makes the formulation of such a correlation impossible. One of the main objects of this study has been to attempt an analysis of the mechanism of the reduction, from which a correlation could be derived. To this end, a thorough search of the relevant literature was conducted and the results are presented in the form of a critical review in the first section of this Thesis.