摘   要：粒度分布是高性能α半水石膏重要的颗粒特性，影响着半水石膏的标准稠度需水量和硬化浆体微结构。文章探讨了α半水石膏水热法制备过程中工艺参数对石膏粒度分布和转化时间的影响。结果表明：搅拌速率是影响α半水石膏粒度分布的最主要因素，随着搅拌速率提高，二次成核速率呈指数增加。转化温度升高有利于半水石膏细度的降低和转化时间的缩短，但随着转化温度升高半水石膏细度变化幅度降低。浆体固液比与半水石膏细度呈反比，不利于制备细小的半水石膏颗粒，但它对于提升产品的产率，降低单位质量产品能耗具有重要意义。

Abstract: The particle size distribution is an important particle characteristic for α-hemihydrate gypsum with high performances, and affects the water requirement of cement standard consistency of hemihydrate gypsum and the micro-structure of hardened gypsum paste. The influence of technical parameters on particle size distribution and conversion time in preparing process for α-hemihydrate gypsum is discussed. The results show that the stirring speed is the most important factor for affecting the particle size distribution of α-hemihydrate gypsum, the second nucleation rate shows exponential growth with the increasing of stirring speed. The increasing conversion temperature is  beneficial for the decreasing of fineness of hemihydrate gypsum and the shortening of conversion time. However, the changing range of fineness of hemihydrate gypsum is decreased with the raising conversion temperature. The solid-liquid ratio is inversely to fineness of hemihydrate gypsum, which is not benefit for preparing fine hemihydrate gypsum particles, however, the solid-liquid ratio can improve of productivity, and the energy consumption for per unit products is decreased.