Control of the Size Degradation Behavior of Coke
Studies on the size degradation behavior of coke were reviewed. Coke is brittle material and the defects that cause volume breakage and surface breakage have been discussed. A possibility that large pores in coke act as "Griffith" flaws was suggested.
The history of coal blending technologies for using low-rank caking coals, which form "weak" coke with fingery structure when carbonized alone, was reviewed. The concept of the degree of void filling during coal softening was discussed.
In order to control the size degradation behavior of coke, the mechanical qualities indicated by drum tests such as the JIS drum test and the MICUM test should be related to the structures and properties of coke.