Upgrading Effect of Medium Temperature Carbonized Coke by Reheating Treatment

An innovative cokemaking process named SCOPE21 has been developed from 1993 to 2003 by member companies of the Japan Iron and Steel Federation as a national project. The concept of this project is higher utilization of non-, slightly coking coals, improvement of productivity and environmental protection.In order to enhance coke productivity, coals are preheated rapidly, fine coals are agglomerated and coke is discharged at medium temperatures. The strength of coke carbonized at medium temperatures will be lower than that of coke carbonized at a temperature over 1000°C so that coke discharged at medium tempera-ture is further heated in an upper part of CDQ pre-chamber to obtain the conventional coke strength.In this study, the quality of cokes discharged at medium temperatures was analyzed and the upgrading effect of them was investigated by three different reheating methods. As a result, it was confirmed that coke discharged at medium temperature could be improved by reheating treatment and upgrading effect was affected by reheating method.