1-4-1 溶剤抽出フラクショネーション法による構造分析にもとづく原料炭・粘結材のコークス化挙動の検討(1-4 構造,Session1 石炭・重質油等,研究発表)

概要

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Steel industries need to increase the use of low-grade coals in coke making due to the recent rapid increase in coking coal price. To do so, it is necessary to effectively use binders, and it is desired to develop a theory on how to mix coals and binders effectively. In this work the coal fractionation method proposed by the authors was applied to characterize coals and binders. Three different-rank coals and two binders (HPC developed by Kobe Steel and ASP) that were heat-treated at 400℃ in ad〓anc〓w〓〓s〓arat〓d into s〓〓〓aOIractions Ka〓ing diII〓〓t p o〓〓u〓r weight by sequential solvent extractions at different temperatur〓 u〓 to 350℃. TK〓cK〓 icaOand 〓KysicaO〓ro〓〓ti〓 of each fraction were found to be almost independent of the coal and binder types. Then, it was clarified that the thermoplastic behaviors of the mixture of coals and binders can be explained by focusing on the relative abundance of the fractions in the mixture. It is therefore possible to determine an appropriate mixing ratio of coals and binders to realize the thermoplastic behavior required to obtain high-strength coke. This approach can be expected as a new mixing theory which is applicable even to low-grade coals and newly-developed binders.
2011-08-09