Abstract: Calcium sulfate whiskers were prepared from commercial CaSO4?2H2O or phosphogypsum. The influence of Fe3+ on properties of calcium sulfate whiskers were studied. The methods including scanning electron microscopy，X-ray powder diffraction，TEM，SAED and EDX were used for characterizing the resultant crystals. The crystals grew along the c-axis and the aspect ratio of calcium sulfate whiskers increased obviously with Fe3+. When n(Ca)/n(Fe)=20，the aspect ratios of calcium sulfate whisker from commercial CaSO4?2H2O and phosphogypsum were up to 80 and 60 respectively. In the presence of Fe3+，well-developed whiskers were attained from phosphogypsum and whiteness of calcium sulfate whiskers was improved.

Key words: calsium sulfate, phosphogypsum, crystallization, hydrothermal, morphology

摘要： 以硫酸钙（分析纯）、磷石膏为原料，水热法制备硫酸钙晶须，实验考察了Fe3+对晶须性能的影响。通过扫描电子显微镜（SEM）、X射线衍射仪（XRD）、透射电子显微镜（TEM）、选区电子衍射（SAED）、能量色散X射线光谱仪（EDX）等对产物进行表征。结果表明，Fe3+可促进硫酸钙晶须的轴向生长，有助于获得大长径比的硫酸钙晶须；当n(Ca)/n(Fe)=20左右时，硫酸钙（分析纯）制得晶须长径比达到最大值80，磷石膏制得晶须长径比为60；Fe3+可有效改善磷石膏水热制得晶须的形貌，抑制晶体的分叉生长，对磷石膏制得晶须白度也有一定程度的提高。

关键词: 硫酸钙, 磷石膏, 结晶, 水热, 形态学