Abstract
Volume and surface breakage rate parameters of conventional and formed cokes were evaluated by using drum test data. Finer crushing of coal lowered both the volume and the surface breakage rate. Conventional and formed cokes, some of which had been partially reacted with CO2 gas, were compared. The formed cokes had higher post reaction strength indices than conventional cokes, because their increases in surface breakage rate caused by the reaction with CO2 gas were less than those of conventional cokes. One of the formed cokes had lower post reaction strength indices because of the high volume breakage rate.
