Abstract The feasibility of fabricating alpha calcium sulfate hemihydrate (α-CSH) whiskers by using flue-gas-desulfurization (FGD) gypsum as source materials was studied. Crystal phase- and morphology-controlled crystallization of gypsum were realized in the designed glycerol-water reaction system. l -glutamic acid was found to accelerate the conversion of calcium sulfate dihydrate (CSD) into α-CSH whiskers by intercalating into layered CSD structure. The time-dependent experiments indicate rod-like CSD first splits into layered structure and then fascicular structure and finally single crystals. The splitting crystallization owing to lattice expansion of CSD generates α-CSH whiskers with a high aspect ratio (∼1:200). The facile method to convert FGD gypsum solid waste into CSD and finally α-CSH whiskers may prove particularly useful in the design of recyclable FGD gypsum with significant environmental impact, and it is particularly important in environmental remediation and green economics.

中文翻译：

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利用烟气脱硫石膏固体废物在甘油-水溶液中快速合成半水硫酸钙晶须

摘要 研究了以烟气脱硫（FGD）石膏为原料制备α-半水硫酸钙（α-CSH）晶须的可行性。在设计的甘油-水反应体系中实现了石膏的晶相和形态控制结晶。发现 l-谷氨酸通过插入层状 CSD 结构加速二水合硫酸钙 (CSD) 转化为 α-CSH 晶须。时间依赖性实验表明棒状 CSD 首先分裂成层状结构，然后是束状结构，最后是单晶。由于 CSD 的晶格膨胀导致的分裂结晶产生具有高纵横比 (~1:200) 的 α-CSH 晶须。