Process for removing sulfur dioxide from flue gases

Details Process for removing sulfur dioxide from flue gases Process for removing sulfur dioxide from flue gases

1989-12-21

1991-02-26

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423164, C01B 1700, C01F 100, C01F 514, C01F 1102

Patent

active

049960326

ABSTRACT:
A process for removing sulfur dioxide from a flue gas in a wet scrubber with an aqueous slurry formed from calcium hydroxide and magnesium hydroxide with magnesium hydroxide or magnesium oxide recovered therefrom. A thickened sludge from a thickener containing calcium sulfite solids is separated and an aqueous sulfite solution removed, with a first portion of the solution returned to the thickener while a second portion thereof is oxidized to form a sulfate solution. Lime is added to the sulfate solution to precipitate calcium sulfate and form an aqueous magnesium hydroxide suspension, with the precipitated calcium sulfate separated from the magnesium hydroxide suspension which may be dewatered to form a magnesium hydroxide product or calcined to produce magnesium oxide.

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patent: 4246245 (1981-01-01), Abrams et al.
patent: 4490341 (1984-12-01), Cares
"Dolomitic Lime Process for Retrofit FGD Applications" Jack Z. Abrams, et al., Proceedings-Second Annual Pittsburgh Coal Conference (1985), pp. 199-211.

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