| Title |
Research Paper - Pyrometallurgy : Effect of Particle Size on Gaseous Reduction Rate of Iron Ore |
| Authors |
강흥원(Heung Won Kang); 정우창(Uoo Chang Chung); 이일옥(Il Ock Lee); 정원변(Won Sub Chung); 소야양일(Yoichi Ono) |
| Abstract |
In order to investigate the effect of particle size on gaseous reduction rate of iron ore, two kinds of iron oxide pellets of different diameters were reduced with CO-CO₂ gas mixture. Results were analyzed using two models, the intermediate model and the unreacted-core model. From the analysis of the former model, the effective diffusivity through product layer, D_s, the effective diffusivity through reactant layer, D_(so), and volume-based chemical reaction rate constant k_v, were not changed with particle diameter while Thiele`s modulus φ and effectiveness factor, E₁ were changed. From that of the latter model, the effective diffusivity through product layer, D_s was not varied with particle diameter, while the interface chemical reaction rate constant, k_c was varied. Investigation revealed that particle size affected a gas-solid reaction modules and that this affected gaseous reduction rate. |