Calcium sulfate hemihydrate (CSH) whiskers were synthesized by phase transition in CaCl₂ solution under atmospheric pressure. Analytical-grade calcium sulfate dihydrate (AR CSD) was used as the raw material for the synthesis of CSH whiskers, according to orthogonal experiments. The effects of reaction temperature, AR CSD content, H₂SO₄ content, and reaction time were investigated, and the crystallization conditions were optimized. The as-prepared CSH whiskers displayed a regular morphology and a highly uniform size, with an aspect ratio of 105. A simulation system was also established by blending various sulfates with AR CSD, to evaluate the effects of impurities in flue gas desulfurization (FGD) gypsum. The main aim was to prepare CSH whiskers directly from FGD gypsum, without any purification, using the optimized conditions. This is a facile potential alternative process for large-scale production of CSH whiskers using abundant FGD gypsum as source materials.

通过在大气压下于CaCl ₂溶液中进行相变，合成了半水合硫酸钙晶须。根据正交实验，将分析级硫酸钙二水合物（AR CSD）用作合成CSH晶须的原料。反应温度，AR CSD含量，H ₂ SO _4的影响研究了其含量和反应时间，并优化了结晶条件。所制备的CSH晶须显示出规则的形态和高度均匀的尺寸，长径比为105。还通过将各种硫酸盐与AR CSD混合来建立模拟系统，以评估杂质对烟道气脱硫（FGD）的影响。石膏 主要目的是使用优化的条件直接从FGD石膏制备CSH晶须，无需任何纯化。这是使用丰富的烟气脱硫石膏作为原料大规模生产CSH晶须的潜在替代方法。