电厂煤飞灰单个颗粒的化学表征

用扫描电镜Ｘ射线能谱对电厂煤飞灰单个颗粒进行了形貌，粒度和化学组成的观察与分析，用Ｘ射线衍射鉴定了煤飞灰粗细颗粒中元素存在的化学形态（化合物或物相）结果表明，煤飞灰中有较多球形颗粒，还有一些不规则形颗粒，主要含有Ｓｉ，Ａｌ，Ｃａ，Ｆｅ，Ｓ，Ｋ等，不同形貌，大小颗粒中的组分含量差别较大，但大多以硅铝酸盐为基体，其它元素分布在颗粒表层（约１μｍ）中，粗细颗粒中均有石英和氧化铁，但粗粒中还富含Ｃａ和Ｆｅ

CHEMICAL CHARACTERIZATION OF INDIVIDUAL FLY ASH PARTICLES FROM COAL-FIRED POWER PLANT

Individual particles of coal fly ash from power plant were analyzed by scanning electron microscopy equipped with an energy dispersive X-ray spectrometer for investigating their morphology and chemical composition. Chemical compounds/phases in corase and fine particles were identified by X-ray diffractometer. Results indicate that the great majority of the particules are spherical and some irregular. Most of them have alumi-nosilicate matrix with other elements distributed on the surface layer of the particles. It was shown that silicon and aluminium oxides,calcium carbonate,sulfate and some clay minerals are enriched in coarse fraction. Iron oxides,sulfide,sulfate and some chlorides are found to dominant in fine fraction. The soluble fraction of fly ash is calcium sulfate and gypsum. The composition of the insoluble fraction is found to be the same as that of fly ash particle itself.