lution microscope as analysis methods, the growth principle of calcium sulfate under different pH values was explored. The results reveal that with the increase of pH value, the aspect ratio of calcium sulfate whiskers firstly increased and then decreased. When the pH value was 5, the whisker diameter was 1~4 μm, the average length 218.67 μm and the aspect ratio reached the maximum value of 82.57. The change of pH value exerted a direct influence on the existence of impurities, with the increase of pH, SiO2 within the impurities gradually transformed into CaSiO3, and the equilibrium of ions in the solution changed and hence affected the growth tendency of the whiskers in a specific direction. Key words: desulphurization gypsum; calcium sulfate whiskers; pH value; aspect ratio; conductivity
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