Highly Active Absorbent for SO2 Removal Prepared from Coal Fly Ash

Autor:	Hiroaki | Tsuchiai, Hideaki Kita, Hideshi Hattori, Ueno Tsutomu, Ishizuka Tomohiro
Rok vydání:	1995
Předmět:	Ettringite Flue gas General Chemical Engineering Mineralogy General Chemistry Industrial and Manufacturing Engineering Flue-gas desulfurization chemistry.chemical_compound chemistry Chemical engineering Fly ash Calcium silicate Hydration reaction Calcium oxide Sulfur dioxide
Zdroj:	Industrial & Engineering Chemistry Research. 34:1404-1411
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie00043a048
Popis:	The absorbent for SO{sub 2} from the flue gas of a coal-fired electric power station was prepared from calcium oxide, calcium sulfate, and coal fly ash and examined for the relation between the desulfurization activity and the structure. The activity is closely related to the progress of the hydration reaction taking place during preparation procedures. The activity increased with the hydration time and reached a maximum activity in 12 h. The hydration resulted in the formations of ettringite and calcium silicate. By elevation of the temperature for drying the hydration products, the activity markedly increased up to 400 C, which was caused by the removal of water covering the calcium component in the ettringite. For the efficient removal of SO{sub 2}, the existence of NO in the flue gas is required. NO{sub x} plays a catalytic role for oxidation of SO{sub 2} to SO{sub 3} which reacts with CaO to form CaSO{sub 4} as a final product.
Databáze:	OpenAIRE
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