α半水石膏水热法制备工艺参数对颗粒粒度特性影响探讨  

Discuss of Effects of Hydrothermal Method Process Parameters ofα-hemihydrate Gypsum on Particles Size Characteristic

作　　者：唐明亮[1,2] 郑海[2] 沈裕盛[1] 沈晓冬[1] 刘宝[2] 

机构地区：[1]南京工业大学材料科学与工程学院材料化学工程国家重点实验室,210009 [2]南京工业大学东海先进硅基材料研究院,222300

出　　处：《混凝土与水泥制品》2015年第7期71-74,共4页China Concrete and Cement Products

基　　金：国家建筑材料行业科技创新计划项目(2013-M4-3);长江学者和创新团队发展计划项目(IRTll46);江苏高校优势学科建设工程项目(2011-6);国家科技支撑计划课题(2014BAL03B00)

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。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 microstructure 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.

关 键 词：Α半水石膏 粒度分布 工艺参数 

分 类 号：TU528[建筑科学—建筑技术科学]