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对二家电厂的化学组成相似而形成条件不同的粉煤灰进行了研究,采用了重选、磁选等方法对原状粉煤灰进行了颗粒分选,应用扫描电镜观察其玻璃质颗粒的形貌,应用化学分析测定其化学组成。应用红外光谱和硅钼酸法定性地测定了粉煤灰玻璃体中硅氧阴离子的聚合程度,应用WYZ法测定粉煤灰的火山灰活性,实验表明:粉煤灰的形成条件影响其相组成,玻璃体的含量以及玻璃体结构,最终影响了粉煤灰的火山灰活性。根据研究的结果,作者提出了与节能要求相符的改进粉煤灰形成条件的措施,以期获得既可充分利用燃煤的能量,又可提高粉煤灰的火山灰活性的良好效果。
The fly ash with similar chemical composition and different conditions in the two power plants was studied. Particles were separated from the original fly ash by re-election and magnetic separation. The shape of the glass particles was observed by scanning electron microscopy. Morphology, applied chemical analysis to determine its chemical composition. The degree of polymerization of silicium anion in fly ash vitreous body was determined by infrared spectroscopy and silicomolybdic acid, and the pozzolanic activity of fly ash was determined by WYZ method. The experimental results show that the formation conditions of fly ash influence the phase composition and the vitreous body. The content and vitreous structure ultimately affect the pozzolanic activity of fly ash. Based on the results of the study, the authors proposed measures to improve the formation conditions of fly ash in line with the requirements of energy conservation, in order to obtain a good effect that can fully utilize the energy of coal combustion, but also improve the pozzolan activity of fly ash.