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Title:
METHOD AND APPARATUS FOR REMOVING UNBURNED CARBON IN FLY ASH
Document Type and Number:
WIPO Patent Application WO/2010/004941
Kind Code:
A1
Abstract:
Disclosed are a method and apparatus for removing unburned carbon in fly ash that yields high-quality modified fly ash at high throughput by increasing the dehydration kinetics and efficiency in the dehydration process, without decreasing the efficiency of sink-float separation in a flotation process. A method for removing unburned carbon in fly ash comprising a slurrification process (20), in which water (w) is added to fly ash (FA) to produce a slurry, a surface modification process (21), in which a collecting agent (c) is added to the slurry, a foaming agent addition process (22), in which a foaming agent (f) is added to the slurry, a flotation process (23), in which the slurry is sink-float separated into a precipitate and a float, and a precipitation dehydration process (26), in which a slurry of the precipitate obtained by the flotation process (23) is dehydrated, wherein the slurry is dehydrated after the flotation process (23) by means of a circulation concentration process (24) in which the precipitate slurry obtained by the flotation process (23) is circulated between an intermediate tank, where the precipitate slurry is temporarily stored, and a centrifugal dehydrator, and this dehydrated slurry is then transported to the precipitate dehydration process (26).

Inventors:
KATAKURA,Masahiko (6-4, Tsukiji 5-chome, Chuo-k, Tokyo 39, 〒1048439, JP)
片倉 正彦 (〒39 東京都中央区築地5丁目6番4号 三井造船株式会社内 Tokyo, 〒1048439, JP)
SUZUKI,Takao (6-4, Tsukiji 5-chome, Chuo-k, Tokyo 39, 〒1048439, JP)
Application Number:
JP2009/062228
Publication Date:
January 14, 2010
Filing Date:
July 03, 2009
Export Citation:
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Assignee:
MITSUI ENGINEERING & SHIPBUILDING CO., LTD. (6-4 Tsukiji 5-chome, Chuo-ku Tokyo, 39, 〒1048439, JP)
三井造船株式会社 (〒39 東京都中央区築地5丁目6番4号 Tokyo, 〒1048439, JP)
KATAKURA,Masahiko (6-4, Tsukiji 5-chome, Chuo-k, Tokyo 39, 〒1048439, JP)
片倉 正彦 (〒39 東京都中央区築地5丁目6番4号 三井造船株式会社内 Tokyo, 〒1048439, JP)
International Classes:
B03D1/10; B03B1/04; B03D1/02; C02F11/12
Domestic Patent References:
WO2008078389A1
Foreign References:
JP2004230284A
JP3613347B1
JP2007167787A
JP2008006405A
JPH07213949A
Attorney, Agent or Firm:
OGAWA,Shin-ichi et al. (Seiryu International Patent Office, 37 Kowa Building 4-5, Tsukiji 1-chome, Chuo-k, Tokyo 45, 〒1040045, JP)
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