Study of Using Desulfurization Products from Flue Gas of RCFB as Cement Retarder

In this paper,using desulfurization products from flue gas of reflux circulation fluidized bed(RCFB) as cement retarder was studied by the analytical metheds of XRD and SEM etc.The results show the desulfurization products can substitute gypsum as cement rtarder,and all the physical properties of the cement fit for the requires of national standard,the retarder is AFm generated by the chemical reaction of CaSO3·0.5 H2O in desulfurization products and C3A in cement.Compared with the standard cement containing gypsum,the initial setting time of the cement containing desulfurization products is shortened,but final delayed.Its 3 compressive strength is lower,but 7's matches with standard cement.All of its antiflex strength are lower than the standard cement.The differences of physical properties between the cement containing desulfurization products and that of gypsum are because of the differences between the formation process and structures of AFm and AFt.