EFFECT OF IRON-ORE SHAPE ON GASEOUS REDUCTION RATE

In order to clarify the effect of particle shape on the gaseous reduct ion rate of iron ores, iron oxide pellets of various shapes including the long cylindrical- and the disc shape are reduced with 10%CO-90%CO2 gas mixture. Experimental results show that the reduction rate of the disc-shaped particle is the fastest among all and the long cylindrica l particle follows. The experimental data are analyzed by the unreacte d-core model for non-spherical particle proposed by authors in the pre vious paper. According to the analysis, this model is applicable for t he non-spherical iron ore of the cylindrical shape within the ratio ra nge of the height to the cylindrical diameter from 0.5 to 2 while the particles of the long cylindrical- and disc-shaped particle out of thi s range are problematic applying the model. Based on the review of the experimental- and analysis results, the kinetic behavior concept for the non-spherical particle including the long cylindrical- and disc-sh aped particles is discussed.