Magnesium-enhanced sulfur dioxide scrubbing with gypsum formatio

Details Magnesium-enhanced sulfur dioxide scrubbing with gypsum formatio Magnesium-enhanced sulfur dioxide scrubbing with gypsum formatio

1995-05-24

1997-07-08

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

42324303, 42324308, 423555, C01B 1722, C01F 1136

Patent

active

056458070

ABSTRACT:
A wet scrubbing method for removal of sulfur dioxide from a gaseous stream uses a magnesium-enhanced lime scrubbing aqueous slurry, where a solids content in the aqueous slurry in a wet scrubbing unit is maintained at an amount of between 13 to 20 percent by weight. A bleed stream is removed from the aqueous scrubbing slurry at a pH of between 4.5-5.6 and fed to an oxidizing unit wherein calcium sulfite is oxidized to gypsum. The gypsum and residual solids in the discharge from the oxidizing unit are separated to produce a clarified solution, which is returned to the wet scrubbing unit.

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