石炭灰・スラグの種類と用途(<特集>石炭灰とスラグ)

概要

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In the reinforcement of the legal system and the growing social needs about waste disposal treatment and promotion of the recycling-oriented society, it is necessary to enlarge the utilization of coal ash and gasification slag, except the cement material and the landfill. Understanding fly ash and slag formation in the combustor and the gasifier provides both a background and basis for the alternative uses of the resultant fly ash and slag. A fly ash by product is an important raw material for various applications in construction, agriculture and fisheries. R & D for concrete admixture of the fly ash should be made for a promotion of the recycling-oriented society. A slag by-product is produced from gasification as molten ash flows from the bottom of a gasifier where it is quenched. The coarse slag by-product has unique physical and chemical properties and can be used for some applications such as base course material and cement material. In addition, the slag by-product can also be ground and used as a lightweight aggregate and a cement additive to improve the properties of concrete. Further research in these areas is also discussed.
2011-05-20