抄録
Although it is required hardness for coke in the blast furnace, CO2 is generated by reduction of iron ore and the CO2 gasify coke and make coke brittle. However, there is a case where the strength does not easily lowered. One of the reasons is difference of coke optical textures. So, there are many studies about influence of gasification on coke optical textures. However, almost of these reasearches are about CO2 gasification and there is a little about CO2/H2O mixed gas. In this study, since H2 rich gas is used for reducing gas and CO2/H2O gasification is occured in NEDO project COURSE50, influence of CO2, H2O, CO2/H2O gasification on coke optical textures was investigated by using image analysis of the coke cross-section. As a result, it was revealed that inert and isotropic textures had higher reactivity and ratio of inert, isotropic and mosaic textures reactivity was 1.00:0.71:0.20. This ratio was almost same in all gas.
