加压水溶液法制备工艺对α型高强石膏性能的影响

摘要/Abstract

摘要： 采用加压水溶液法以脱硫石膏为原料制备高强石膏,其工艺参数是决定高强石膏制备品质的关键。通过研究水热温度、水热时间、搅拌转速及料浆浓度四种工艺参数对α型高强石膏性能的影响规律,对不同工艺参数下制备样品的晶体形貌和石膏相组成进行定性及定量分析,并优化出加压水溶液法制备α型高强石膏的最佳工艺。结果表明,水热温度对生成晶体的尺寸及长径比的影响较大,水热时间主要影响晶体的尺寸,对长径比的影响不大,而水热温度和水热时间是影响α型高强石膏相组成的重要因素。搅拌转速和料浆浓度主要影响高强石膏尺寸及长径比,对石膏相组成影响不大。在最佳工艺条件下:水热温度130 ℃、水热时间4 h、搅拌转速250 r/min及料浆浓度30%(质量分数),制备的α型高强石膏2 h抗折强度为5.4 MPa,烘干抗压强度为41.9 MPa。

关键词: α型高强石膏, 工艺参数, 长径比, 石膏相组成, 加压水溶液法

Abstract: The high strength gypsum is prepared from desulfurization gypsum by pressurized aqueous solution method, and its process parameters are the key to determine the preparation quality of the high strength gypsum. The effects of hydrothermal temperature, hydrothermal time, stirring speed and slurry concentration on the properties of α-high strength gypsum were studied. The crystal morphology and gypsum phase composition of the samples prepared under different process parameters were qualitatively and quantitatively analyzed, and the optimal preparation process of α-high strength gypsum by pressurized aqueous solution method was optimized. The results show that the hydrothermal temperature has a great influence on the size and aspect ratio of the generated crystals, while the hydrothermal time mainly affects the size of the crystals and has little influence on the aspect ratio. While the hydrothermal temperature and hydrothermal time are important factors affecting the phase composition of α-high strength gypsum. The stirring speed and slurry concentration mainly affect the size and the aspect ratio of the high strength gypsum and have little influence on the composition of the gypsum phase. Under the optimum process conditions: the hydrothermal temperature of 130 ℃, the hydrothermal time of 4 h, the stirring speed of 250 r/min and the slurry concentration of 30% (mass fraction), the 2 h flexural strength of α-high strength gypsum is 5.4 MPa and the drying compressive strength of 41.9 MPa.

Key words: α-high strength gypsum, process parameter, aspect ratio, gypsum phase composition, pressurized aqueous solution method

中图分类号:

TQ177

韩康, 管学茂, 王燕峰, 刘松辉, 李一凡. 加压水溶液法制备工艺对α型高强石膏性能的影响[J]. 硅酸盐通报, 2021, 40(5): 1620-1630.

HAN Kang, GUAN Xuemao, WANG Yanfeng, LIU Songhui, LI Yifan. Effect of Preparation Process of Pressurized Aqueous Solution Method on Properties of α-High Strength Gypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1620-1630.

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