以固体废弃物磷石膏为原料，在传统常压醇水热法的基础上添加CaSO4·2H2O为晶种制备半水硫酸钙晶须。采用单因素试验法探究了晶种含量、丙三醇含量和磷石膏质量分数对晶须结构和形貌的影响，确定晶须的最佳制备工艺条件。采用SEM和XRD对样品进行表征分析，实验结果表明:添加CaSO4·2H2O晶种制备晶须的长径比(49.29)比只添加丙三醇的样品的长径比(30.99)提高了近60%；当丙三醇与水的体积比(V)为1、晶种含量为1%、磷石膏质量分数为5%时制备的晶须的平均直径为0.65 μm，长径比达到了62.15，晶须的尺寸均匀。这说明添加1%CaSO4·2H2O晶种、V为1的丙三醇和质量分数为5%的磷石膏在常压下能制备出高长径比和尺寸均匀的半水硫酸钙晶须。

Hemihydrate calcium sulfate whiske were prepared from phosphogypsum, which is phosphate mining enterprises produce waste slag, by raditional normal pressure alcohol hydrothermal method adding CaSO4 · 2H2O as crystal seed. In order to find the optimum preparation conditions, the effects of seed content, glycerol content and phosphogypsum mass fraction on the structure and morphology of whiskers were investigated by single factor test. These samples were characterized by SEM and XRD. The results show that the aspect ratio of the whisker prepared with CaSO4·2H2O crystal seed (49.29) is 30.99, which is about 60% higher than that prepared with glycerol. When the volume ratio (V) of glycerol to water is 1, the content of seed is 1%, and the mass fraction of phosphogypsum is 5%, the average diameter of prepared whiskers is 0.65 μm, the aspect ratio is 62.15, and the size of whiskers is uniform. These results indicate that hemihydrate calcium sulfate whisker with high aspect ratio and uniform size can be prepared by adding 1%CaSO4·2H2O seed, glycerol with V of 1 and phosphogypsum with mass fraction of 5% under atmospheric pressure.