Method and product of fly ash benefication by carbon burnout in

Details Method and product of fly ash benefication by carbon burnout in Method and product of fly ash benefication by carbon burnout in

1991-04-05

1992-11-03

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106478, 106DIG1, C04B 1806, C04B 1436, C04B 2004

Patent

active

051605392

ABSTRACT:
This invention relates to an apparatus, method and product wherein fine particles of fly ash containing carbon are oxidized in a dry, bubbling fluid bed of previously introduced fine particles of the same fly ash so that the subsequently removed particles have reduced carbon content and are useful as pozzolan, suitable for use, without further processing, to replace a portion of the cement in concrete. The preferred conditions are a temperature of about 1300.degree. to 1800.degree. F., air velocity 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 minutes, volume ratio of air to fly ash of between about 1,000 and 1500, and an excess of oxygen between about 5% and 15%.

REFERENCES:
patent: 3328180 (1967-06-01), Ban
patent: 3979168 (1976-09-01), Chalivin
patent: 4043831 (1977-08-01), Friedman
patent: 4121945 (1978-10-01), Hurst
patent: 4304659 (1981-12-01), Pratt et al.
patent: 4325833 (1982-04-01), Scott
patent: 4341623 (1982-07-01), Bertolacini et al.
patent: 4705409 (1987-11-01), Trerice
patent: 4959334 (1990-09-01), Mauleon et al.

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