Flue gas desulfurization with oxidation of calcium sulfite in FG

Details Flue gas desulfurization with oxidation of calcium sulfite in FG Flue gas desulfurization with oxidation of calcium sulfite in FG

1989-08-18

1990-12-11

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423555, C01B 1700, C01F 1146

Patent

active

049769367

ABSTRACT:
A method for removing sulfur dioxide from flue gases, with oxidation of calcium sulfite in the discharge from a liquid scrubbing system to produce gypsum, oxidizes the sulfite in a thickener overflow at a pH of between 4.0 and 6.5. The calcium sulfite is oxidized to a calcium sulfate which precipitates from the aqueous media and is separated, while the acidic aqueous media is recycled to an acidification step preceding the oxidation. A further minor portion of scrubber slurry may be discharged from the liquid scrubber unit at a pH of 4.5 to 6.0 and also treated with acid, oxidized, and the resultant gypsum separated.

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