Title:
METHOD FOR PRODUCING MODIFIED FLY ASH
Document Type and Number:
WIPO Patent Application WO/2020/022173
Kind Code:
A1
Abstract:
In a method for producing a modified fly ash with a small unburned carbon content by heating a starting fly ash for burning and removing unburned carbon, heating needs to be performed at a temperature of about 500-1000°C in an environment where air (oxygen) necessary for burning is present in a sufficient amount so as to sufficiently burn and remove the unburned carbon. Since a great deal of energy is required to heat the fly ash and the large amount of air to the aforesaid temperature, there has been needed a more efficient method for burning unburned carbon. In the present invention, this problem is solved by removing a coarse powder by air classification prior to heating a starting fly ash. Preferably, the classification point is adjusted so as to give a 45 μm sieve residue of 30 mass% or less.
Inventors:
OMURA KOHEI (JP)
Application Number:
PCT/JP2019/028211
Publication Date:
January 30, 2020
Filing Date:
July 18, 2019
Export Citation:
Assignee:
TOKUYAMA CORP (JP)
International Classes:
C04B18/08; B04B3/00; B04C5/12; C04B7/26
Foreign References:
| JPS5960115A | 1984-04-06 | |||
| JPH1045444A | 1998-02-17 | |||
| JPS5885011A | 1983-05-21 |
Attorney, Agent or Firm:
ONO, Hisazumi et al. (JP)
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