WO 2018/168637 A1

Method for using fly ash

(22) 08.03.2018

(43) 20.09.2018

(57) A method for using fly ash, said method comprising: measuring the unburned carbon content of fly ash (PCF ash) generated from a pulverized coal combustion boiler; sorting the PCF ash on the basis of a preset threshold of unburned carbon content and storing the same; in the PCF ash sorted above, classifying a portion of PCF ash having a low unburned carbon content into a coarse powder and a fine powder; using the fine powder as fly ash for a cement mixing material or a concrete mixing material; in the PCF ash sorted above, mixing a portion of PCF ash having a high unburned carbon content with the coarse powder or fly ash (FBF ash) generated from a fluidized bed combustion boiler; and using the mixed powder thus obtained as a starting material for producing a cement clinker.

(71) Tokuyama Corporation, Yamaguchi (JP)

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