作　　者： ; ; ; ;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《分析测试学报》 2009年第9期1008-1011,共4页

摘　　要： 采用XRD和SEM表征粉煤灰-石灰体系蒸压反应中水石榴石的形成与转变,采用FTIR、ICP-AES等手段分析相关反应机理。结果表明:在粉煤灰-石灰蒸压体系中,反应开始时,氢氧化钙大量参与反应,快速生成结晶完整的水石榴石。随着蒸压时间的延长,体系中硅和铝继续从粉煤灰中溶出,改变了水石榴石所处的碱性环境,水石榴石开始分解,进而生成水化硅酸钙。水石榴石少量分解时,水化硅酸钙以细小的纤维状形式存在;大量分解时,水化产物逐步发育为结晶良好的水化硅酸钙。 The formation and transformation of hydrogarnets in fly ash - lime autoclaved system were characterized by XRD and SEM method, and the corresponding reaction mechanism were investigated by ICP- AES and FTIR method. The result indicated that, in fly ash -lime autoclaved system, hydrogarnet with good crystal lattice structure was formed rapidly for the joining of most of Ca （OH） 2 at initial stage of the reaction. However, with extension of autoclaving duration, the dissolved a- mount of Si4 ＋ ions and A13 ＋ ions from fly ash increased, and the alkali enviroment of reaction system was changed, resulting in the decomposed of hydrogarnet and formation of hydrated calcium silicates. Hydrated calcium silicates grew into fiber structure when small amount of hydrogarnets were decom- posed, and while large amounts of hydrogarnets were decomposed, hydrated calcium silicates grew into flaky crystal.

关 键 词： 水石榴石 蒸压 水化硅酸钙

领　　域： [化学工程] [化学工程]