Abstract
The synthesis of hemihydrate gypsum (α-HH) crystals with a low aspect ratio is of great significance to practical production for the effective utilization of flue gas desulfurization (FGD) gypsum. In this work, the hexagonal prismatic α-HH crystals with controllable morphology were prepared in Glycerol-NaCl-Water solutions with maleic acid, and the average aspect ratio of α-HH crystals decreased from 19.49 to 1.10. The phase transformation time decreased with the NaCl concentration, increased with the pH of the reaction solutions, but higher pH destroyed the crystal structure of α-HH. The phase conversion process involves the dissolution of FGD gypsum and nucleation of α-HH crystals was immediately observed by a microscope in real time. Maleic acid might adsorb on the (204), (200), and (020) crystal planes of α-HH and retarded or promoted the crystal growth along different directions, thus realizing the effective control of α-HH crystal morphology.
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