Limestone-gypsum flue gas desulfurization process

Details Limestone-gypsum flue gas desulfurization process Limestone-gypsum flue gas desulfurization process

1982-02-22

1984-12-11

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423242, 106109, 106110, C01F 1146, C01B 1700

Patent

active

044877846

ABSTRACT:
A flue gas desulfurization process capable of producing a high purity gypsum and also making equipment employed as minimum as possible is provided, which process comprises the steps of cooling and dedusting flue gas containing SO.sub.x ; contacting the cooled gas with a slurry containing limestone to remove SO.sub.x by absorption and also form CaSO.sub.3 ; controlling the pH of the resulting slurry and then blowing air therein to form gypsum; and separating gypsum from the resulting slurry. As a modification of the above process, the slurry of the above second absorption step is further fed to the above first cooling step where unreacted limestone and SO.sub.x are reacted to form CaSO.sub.3.

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patent: 4364910 (1982-12-01), Willett et al.

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