8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

The Influence of pore on reduction behavior of iron oxide is very important. The pore affects the reduction gas diffusion and thus the reduction behavior is affected. However, in most studies, porosity was used only as a tool for the resultant interpretation of the reduction. There is insufficient studies to identify porosity by artificially changing pore. In this study, we investigate the reduction behavior by changing only pores after fixing other influencing reducing factors. FeCl2 of high vapor pressure at high temperature, was used to control pores in the sample. FeO and FeCl2 were physically mixed in a vertical furnace and the FeCl2 was evaporated at high temperature to form pores. Reduction behavior was investigated by TGA experiment method. By using XRD, SEM, CIC, and BET analysis, the following results were obtained by examining the correlations of compositional equilibrium, morphology, Cl content, porosity and so on. As expected, the amount of pores in the sample was increased in proportion to the amount of FeCl2 initially added by evaporation of FeCl2. The amount of pores in the sample was increased, but the initial rate of reduction was inversely proportional to the pore volume. After the mid-reduction, the rate of reduction tended to increase again in proportion to the initial value of the sample. It was found that not only the amount of pores but also the quality of pores could be an important factor in reduction.