Beall Law Offices
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. 
Babcock-Hitachi Kabushiki Kaisha
B C
B01D C01F
inventional inventional
Hiroshi Tsukasa Taiki Masakatsu Shigeru Osamu
Kuroda Nishimura Hashimoto Nishimura Nozawa Kanda