Preparation of calcium sulfate whiskers from FGD gypsum via hydrothermal crystallization in the H2SO4-NaCl-H2O system

- Calcium sulfate whiskers (CSWs) were prepared from purified FGD gypsum in H2SO4-NaCl-H2O system.
- Crystallization of CSW could be controlled via the formulas of H2SO4 and NaCl.
- H2SO4 and NaCl have opposite effects on the solubility of FGD gypsum.