抄録
We have been developing a coal derived caking additive to make a strong coke for blast furnace. It is a coal extract, dissolved in a methylnaphthalene-based solvent at 360-400℃, named "High-Performance Caking additive, HPC". HPC has an excellent thermal plasticity and a dilatability. On the other hand, similar amount of insoluble coal, 'RC' is produced in this process. RC appeals no thermal plasticity, and has a high concentration of ash. However, it seems to play as a filter to form a substitution for a strong caking coal by suitable mixing with HPC in the process. Caking properties of the mixtures were examined to evaluate a suitable mixing condition of RC. It was resulted that around 30% of RC concentration was the most effective to use as the substitution for caking coal. Viewed in this point, 80% of the feed stock, steaming coal, can be utilized as a caking coal.
