イナート粒度がコークス強度に及ぼす影響(コークス性状,コークスその1,<特集号>製銑プロセスの環境調和・資源対応力強化を目指して)

概要

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In order to improve coke strength by technique of coal size control, it is essential to understand relationship between inert size and coke strength. The size and area of inert in coke was measured with a microscope and an image analysis technique and the effect of inert size on coke strength was investigated. Moreover the reason why DI^<150>_<-6> leveled off at inert size of 1.5mm was investigated. The results are follows. (1) When the inert size is between about 1.5mm and 5mm, surface breakage product (DI^<150>_<-6>) decreases as the size of inert in coke becomes smaller. When the inert size is over about 5.0mm, volume breakage product (DI^<150>_<6-15>) decreases as the inert size becomes smaller. (2) The effect of 1% inert in coke on DI^<150>_<-6> and DI^<150>_<6-15> was clarified. (3) According to Hertzian contact theory and Griffith equation, it is estimated that the crack under 0.5mm doesn't grow by fall of coke in drum tester. Critical inert size (1.5mm) is appropriate values for this critical crack size (0.5mm), because size of the crack around inert particle is equal to the inert size or is smaller than it.
社団法人日本鉄鋼協会の論文
2006-12-01