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    • 3. 发明申请
    • PROCESS FOR REFORMING THE FLY ASH
    • US20210032163A1
    • 2021-02-04
    • US16978623
    • 2019-03-11
    • TOKUYAMA CORPORATION
    • Kenichi KAKIZONOKohei OMURATakuya SEKITakeshi KAWANO
    • C04B18/08C04B7/26B07B11/06B07B4/08B07B11/02C04B7/40B09B3/00
    • A process for reforming the fly ash, including the heating step that heats a raw fly ash powder containing the unburned carbon at a temperature of 780 to 1000° C. to decrease the amount of the unburned carbon contained in the raw fly ash powder; and the cooling/classifying step that introduces the heat-treated fly ash in a state of being maintained at a high temperature as obtained through the heating step into a cooling/classifying apparatus so that the fly ash is separated into a fine grains and a coarse grains; wherein the cooling/classifying apparatus 3 used in the cooling/classifying step has a basic structure in which the gas flow for classification is introduced from the lower side and the gas flow Z for cooling/classification introduced into the apparatus is then discharged from the upper side; the heat-treated fly ash is brought into contact with the gas flow Z for cooling/classification, the fine grains contained in the heat-treated fly ash is lifted up and discharged out of the apparatus while the coarse grains contained in the heat-treated fly ash is allowed to stay in the apparatus 3, and the fine grains and the coarse grains are separated and cooled; and the fine grains discharged from the apparatus 3 is recovered by using a dust-collecting apparatus, and the coarse grains is recovered from the apparatus 3.