Utilization of Coal Ash from Fluidized-Bed Combustion Boilers as Road Base Material
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概要
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Characteristics of the coal ash from a 75-t/h coal-fired fluidized-bed combustion boiler were studied experimentally. After producing solidified coal ash using a 75-t/d plant, its characteristics in both block and crushed forms were also studied experimentally. Results can be summarized as follows.<BR>1) A solid phase reaction takes place between coal ash and CaO at around 850°C, the FBC boiler bed temperature, generating a large amount of hydraulic substances.<BR>2) Coal ash consisting of 10-20% of CaO and 15% or less of unburnt carbon can be turned into a solid of high strength after steam curing at 60°C.<BR>3) Granular solidified coal ash can satisfy the Standards of Upper Subbase Materials and the Enviromental Standards for Soil.
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