Title:
METHOD FOR RECOVERING FLY ASH
Document Type and Number:
WIPO Patent Application WO/2020/008783
Kind Code:
A1
Abstract:
Provided is a method for recovering fly ash, the method comprising a firing step for firing fly ash raw powder containing unburned carbon, and thereby burning and removing the unburned carbon. The method further comprises a step for measuring the content of unburned carbon in the fly ash raw powder, and a sieve classification step for sieve-classifying the fly ash raw powder to thereby obtain a fly ash fine powder which is the undersize fraction having a reduced content of unburned carbon, wherein the sieve mesh size used in the sieve classification step is set according to the content of unburned carbon in the fly ash raw powder, a sieve having a small mesh size is used when the content of unburned carbon is high, a sieve having a large mesh size is used when the content of unburned carbon is low, and the undersized fly ash fine powder is recovered through the firing step.
Inventors:
OMURA KOHEI (JP)
SEKI TAKUYA (JP)
SEKI TAKUYA (JP)
Application Number:
PCT/JP2019/022215
Publication Date:
January 09, 2020
Filing Date:
June 04, 2019
Export Citation:
Assignee:
TOKUYAMA CORP (JP)
International Classes:
C04B18/08; B09B3/00
Domestic Patent References:
| WO2018008513A1 | 2018-01-11 |
Foreign References:
| JPH1045444A | 1998-02-17 | |||
| JPH07155740A | 1995-06-20 | |||
| JP2008126117A | 2008-06-05 | |||
| JPH1160299A | 1999-03-02 | |||
| JP2017029942A | 2017-02-09 |
Other References:
See also references of EP 3819272A4
Attorney, Agent or Firm:
ONO, Hisazumi et al. (JP)
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