No.1-13 Influence of Coke Gasification by CO₂, H₂O, CO₂/H₂O on Coke optical textures.

Abstract

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.