Preparation of Calcium Sulfate Whisker by Atmospheric Acidification Method from Flue Gas Desulfurization Gypsum

In this paper, calcium sulfate whisker (CSW) was synthesized from flue gas desulfurization (FGD) gypsum using atmospheric acidification method. The influence of the leaching parameter (the concentration of hydrochloric acid and leaching temperature) on morphology of CSW was discussed. The optimized leaching parameter is that the concentration of HCl is 3.7mol/L and the leaching temperature is 70 oC. The prepared CSW have high purity and high whiteness. The width of CSW is ranged from 3 to 22μm, and its aspect ratio is ranged from 25 to 80.