Process for producing cement clinker containing coal ash

Details Process for producing cement clinker containing coal ash Process for producing cement clinker containing coal ash

1997-04-10

1998-11-17

Marcheschi, Michael

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106739, 106745, 106750, 106763, 106709, 106DIG1, 264DIG49, C04B 712, C04B 747, C04B 748, C04B 713

Patent

active

058370528

ABSTRACT:
Contaminated coal ash, for example flyash contaminated with carbon is introduced to hot clinker in a cooler downstream of a cement kiln; the carbon is combusted in the cooler to provide a cement clinker having an effective content of flyash free of carbon; this permits use of flyash contaminated with carbon without the need for separate special steps for carbon removal; volatile contaminants or contaminants having a volatile component, for example adsorbed ammonia are similarly removed in the cooler by volatilization.

REFERENCES:
patent: 3961973 (1976-06-01), Jones
patent: 4081285 (1978-03-01), Pennell
patent: 4121945 (1978-10-01), Hurst et al.
patent: 4265671 (1981-05-01), Kroyer
patent: 5449404 (1995-09-01), Folsberg
patent: 5482528 (1996-01-01), Angell et al.
patent: 5650005 (1997-07-01), Kistler
Proceedings: Tenth International Ash Use Symposium, vol. 2: Ash Use R&D and Clean Coal By-Products, Beneficiation of Fly Ash by Carbon Burnout, Cochran and Boyd, pp. 73-1 to 73-9 Jan. 1993.
ASTM C-595-94a, Standard Specification for Blended Hydraulic Cements, pp. 288-293 (Date unknown).
ASTM-C-1157M-95, Standard Performance Specification for Blended Hydraulic Cement, pp. 471-475. (Date unknown).

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