晶质二氧化硅与工业石灰水热合成硬硅钙石反应历程  

Formation of xonotlite during hydrothermal synthesis in the mixture of quartz and lime

作　　者：肖晋宜[1,2] 倪文[1] 王坤英[1] 史珂[1] 陈德平[1] 刘凤梅[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]山西财经大学环境系,山西太原030006

出　　处：《辽宁工程技术大学学报（自然科学版）》2009年第4期645-648,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家高技术863项目(2003AA302610)

摘　　要：针对硬硅钙石水热反应历程研究中存在的分歧,以不同活性的石英粉和工业石灰为原料,在200℃保温条件下对此进行了研究。X射线衍射及SEM扫描电镜对水热产物的分析结果表明,原料活性,尤其晶质二氧化硅的粒度,对硬硅钙石水热反应历程有很大影响。石英粉的中位径为13.13μm时,SiO2与Ca(OH)2的水热反应经过C-S-H相后,不经过托贝莫来石中间相,直接转化为硬硅钙石相。而石英活性较大时,托贝莫来石与硬硅钙石共存于水热产物中。通过控制原料活性以及反应条件,可提高硬硅钙石转化率,有利于提高硬硅钙石型保温制品的性能。In order to understand the formation of xonotlite during hydrothermal synthesis, this paper investigates the hydrothermal synthesis processes of xonotlite at 200℃ with the mixture of quartz and lime. The analytical results of hydrothermal products obtained from X-ray diffraction and electron-microscopic scanning indicate that the reaction activities of raw materials, especially the granularity of quartz, could affect on the phases and morphology ofhydrothermal products. The mixture of quartz and lime is directly transformed into xonotlite through C-S-H, when the median diameter of quartz is 13.13μm. However, tobermorite and xonotlite coexist in hydrothermal products under the condition of higher quartz activity. By controlling reaction activities of raw materials, the transformation rate of xonotlite can be increased and the performance of xonotlite insulation material can be enhanced.

关 键 词：硬硅钙石 托贝莫来石 石英粉 保温材料 

分 类 号：O613.7[理学—无机化学]