MANUFACTURE OF GYPSUM BOARD FROM FGD GYPSUM

摘要

ABSTRACT OF THE DISCLOSUREBy-product gypsum, which is formed during aflue gas desulfurization process, (FGD gypsum) iscarefully formed as an aqueous slurry of crystalshaving a mean particle diameter of between about 35microns and 80 microns and filtered, which filter cakeis substantially completely dried before calcination,without any substantial grinding action, the crystalsare then flash calcined to a hemihydrate, then ground,to reduce consistency, and then formed into an aqueousslurry from which a paper-covered gypsum board isformed of superior core quality.