C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 7/28 (2006.01) C04B 18/08 (2006.01) F27B 15/00 (2006.01) F27B 15/02 (2006.01) F27B 15/10 (2006.01)
Patent
CA 2107571
This invention relates to an apparatus, method and product wherein fine particles of 17y ash containing carbon are oxidized in a dry, bubbling fluid bed of previously introduced fine particles of the same fly ash so chat the subsequently removed particles have reduced carbon content and are useful as pozzolan, suitable for use, without further processing, to replace a portion of ce- ment in concrete. The apparatus comprises a means for introducing said carbon containing fly ash particles into a dry bubbling fluid bed reactor (30). The dry bubbling bed reactor contains fly ash particles (31), means for introducing air into the reactor (34 and 35), means for removing beneficiated fly ash, means for removing heat from the reactor (42), and a means for removing air and combustion products from the reactor (40). The preferred conditions are a temperature of about 1300 °C to 1800 °C, air ve- locity of between at least about 0.5, but not more than about 3 ft./sec, residence time of at least about 2 minutes but up to 100 mi- nutes, volume ratio of air to fly ash of between about 1,000 and 1,500, and an excess of oxygen between about 5 % and 15 %.
Goudreau Gage Dubuc
Progress Materials Inc.
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