α半水石膏晶体生长习性的探讨  

Crystal Growth Habit of Alpha-Hemihydrate Gypsum

作　　者：张巨松[1] 郑万荣[1] 范兆荣[1] 高飞 邓嫔[1] 孙蓬[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168 [2]北新集团建材股份有限公司技术中心,北京100096

出　　处：《沈阳建筑大学学报（自然科学版）》2008年第2期261-264,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：建设部科技攻关项目(2007-k4-19)

摘　　要：目的探讨α半水石膏晶体在纯水、硫酸(盐)、有机酸盐介质水溶液中的生长习性.方法采用加压水溶液法,在0.18MPa压力下水热处理制得α半水石膏晶体,采用激光粒度分析仪、体视显微镜观测晶体的粒度、形貌特征.结果α半水石膏在纯水介质中沿C轴的生长速度最快,SO42-离子加速晶体粗化,晶体沿C轴的生长速度被抑制,[RCOO-]对晶体沿C轴有良好的压缩作用.结论α半水石膏晶体在纯水介质中自由生长成针状产物,在硫酸(盐)介质中宽度生长被加速而长度生长被延缓,在有机酸盐介质中生长速度延缓、其"结晶中心"是以二水石膏转变为半水石膏后的晶体为主.We discussed the crystal growth habit of alpha-hemihydrate gypsum in the pure water medium, sulfate medium and organic acid salt medium under the hydrothermal production process in pressure, and analysed the crystal granularity and morphologic characteristic using Laser granularity analyzer and micro- scope. The result of the test suggested that alpha-hemihydrate crystals had the quickest growth along the C axis in the pure water medium; 8042- ions accelerated crystals coarsening; and [RCOO^- ] had good compressive effect on the crystals along the C axis. Therefore, the alpha-hemihydrate crystals grow into spicula in pure water medium. Their growth delays in width and accelerates in length in the sulfate medium. Their growth speed delays in the organic acid salt medium, and the ＂center of crystallization＂ is primarily alphahemihydrate transformed from gypsum.

关 键 词：Α半水石膏 水热法 晶体生长习性 晶核 

分 类 号：TB321[一般工业技术—材料科学与工程]