Magnesium-enhanced sulfur dioxide scrubbing with gypsum...

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

B - Operations, Transporting

01

D

B01D 53/50 (2006.01) B01D 53/14 (2006.01) C01F 5/22 (2006.01) C01F 11/46 (2006.01) C01F 11/48 (2006.01)

Patent

CA 2147059

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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