System Analysis of the Reduction of Iron Oxides

The parameters of the equilibria that take place during the reduction of iron oxides in the water gas medium (CO-CO2-H-2-H2O) in the presence and absence of carbon are calculated. The possibilities of the diagram technique of representing results are discussed. The following two spatial diagrams are plotted: one of them reflects a set of three phase equilibrium surfaces, and the curved surface in the other diagram consists of a set of six three-phase equilibrium regions separated by four-phase equilibrium lines. The last diagram has a single point that determines the parameters of invariant five-phase equilibrium. A method is proposed to graphically determine possible water gas compositions in equilibrium with the following mixtures: Fe3O4-C, Fe3O4-FeO-C, FeO-C, FeO-Fe(C)-C, Fe(C)-C, and Fe3O4-Fe(C)-C.