| Title |
A Mathematical Model for Gas - Solid Reaction and Reduction Kinetics of Wustite |
| Abstract |
A mathematical model was developed to describe the kinetics of gas-solid reactions. The model incorporates intergrain diffusion, intragrain diffusion, and surface reaction steps in series, and provides for variations in porosity and effective diffusivity of the reacting gas. For quantitative evaluation of the model, a particular system which oxidation of iron to wustite and reduction of wustite to iron were repeated in a cyclic manner to create the structual changes in the product layer was chosen. The prediction was found to agree reasonably well with results of reduction experiments. It should be however pointed out that the model proposed is not adequate to describe the oxidation process since the oxide layer formed is fairly compact. |