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Title: Limestone-gypsum flue gas desulfurization process

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/.
Authors:
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Publication Date:
OSTI Identifier:
5782839
Report Number(s):
US 4487784
Resource Type:
Patent
Resource Relation:
Patent Priority Date: Priority date 22 Feb 1982, Japan; Other Information: PAT-APPL-350598
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; FLUE GAS; DESULFURIZATION; GYPSUM; PRODUCTION; ADSORPTION; AIR POLLUTION ABATEMENT; LIMESTONE; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CALCIUM SULFATES; CARBONATE ROCKS; CHEMICAL REACTIONS; GASEOUS WASTES; MINERALS; OXYGEN COMPOUNDS; POLLUTION ABATEMENT; ROCKS; SEDIMENTARY ROCKS; SORPTION; SULFATE MINERALS; SULFATES; SULFUR COMPOUNDS; WASTES 320305* -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management; 500200 -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (-1989)