粉煤灰-硫酸固相反应中表面形貌与化学组成变化特性的表面分析  

A Study on the Characteristics of Surface Pattern and Chemical Composition Variations of Fly Ash in the Solid-phase Reaction with H_2SO_4

作　　者：阮湘元[1] 彭敏[1] 陈小明[2] 蒋致成[1] 

机构地区：[1]东莞理工学院化学生物工程系,广东东莞523106 [2]湘潭大学化学院,湖南湘潭411105

出　　处：《分析测试学报》2006年第2期100-102,共3页Journal of Instrumental Analysis

基　　金：广东省科技攻关资助项目(2003A3060302);广东省自然科学基金资助项目(5007902)

摘　　要：用扫描电子显微镜／能量色散谱研究了粉煤灰在与H2SO4固相反应过程中表而形貌与组成变化特性。室温下反应约4h后，粉煤灰表面产生直径20—100nm的结晶颗粒并由此相互粘结，反应产生的水溶物可结晶成．花辨状铝铁硫酸盐。在150℃及以上温度反应3h，粉煤灰表面生成大量硫酸盐结晶并由此紧密粘结，大颗粒表面产生纳米级圆形凹陷点，形貌几乎完全改变。固相反应过程中表面形貌和元素组成变化特性揭示，粉煤灰是由可被硫酸剥离的硅、铝、铁等元素纯氧化物构成的聚集体。The characteristics of the variations of surface pattern and chemical composition of fly ash in the solid-state reaction with H2SO4 were studied with scanning electron microscope with energy disperse spectrum（SEM/EDS）. Granular crystalline substances with diameter from 20 to 100 nm were formed on the surface of fly ash after reacting with H2SO4 at room temperature tbr 4 h. The petaling crystals formed from dissolvable substances of treated fly ash were found to be Fe2（SO4）3 and Al2（SO4）3 by SEM/EDS. A large amount of aluminum and iron crystalline salts were produced at/over 150 ℃ reaction temperature for 3 h. The surface patterns of the fly ash were remarkably changed and the particles became adhesive. It was found by SEM/EDS that the fly ash was aggregate of oxides of silicon, aluminum and iron, and could be stripped off with H2SO4.

关 键 词：能量色散谱 扫描电镜 粉煤灰 表面分析 固相反应 

分 类 号：O647.11[理学—物理化学]