Process for producing gypsum from a calcium sulfite gas...

Details Process for producing gypsum from a calcium sulfite gas... Process for producing gypsum from a calcium sulfite gas...

C - Chemistry, Metallurgy

04

B

C04B 11/26 (2006.01)

Patent

CA 2336436

Calcium sulfate dehydrate (dehydrate gypsum) is produced from an aqueous flue gas desulfurization slurry containing primarily calcium sulfite. The aqueous slurry, containing calcium sulfite, is charged, at a pH of about 5.8 to 6.0 into the top of a vertically oriented pressurized oxidation vessel and passed downwardly therethrough while contacting the aqueous slurry with a countercurrent flow of oxygen-containing gas. The pressure in the bottom portion of the oxidation vessel is maintained at about 22-32 psig, and a pressure in the top portion of the oxidation vessel is maintained at about 10-17 psig. The aqueous slurry is maintained at a pH of about 4.0-5.5 and at a temperature of between about 180- 217°F in the vessel such that calcium sulfite in the aqueous slurry is oxidized to dehydrate gypsum with the oxidized slurry removed from the bottom of the oxidation vessel.

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