粉磨超细化对循环流化床固硫灰水化特性的影响

Influence on the Hydration Property of the Superfine Grinding Circulating Fluidized Bed Combustion Fly Ash

为了解超细固硫灰的特性,更好地实现超细固硫灰的应用,研究了不同细度固硫灰的基本物化性质,尤其是水化特性。通过XRD、TG、SEM、EDS等分析测试手段研究了水化放热过程,水化产物的物相及数量变化,微观形貌和成分,分析了细度对固硫灰水化特性的影响。结果表明,粉磨超细化有利于提高固硫灰的水化反应活性和有效反应组分,改善硬石膏的溶解速率和水化放热速率,加深水化反应程度,有利于解决原状固硫灰水化缓慢所引起的体积稳定性差的问题。

The physical and chemical properties of circulating fluidized bed combustion fly ash with different fineness were studied, especially the hydration property, for understanding the characteristics and application of superfine circulat- ing fluidized bed combustion fly ash. The exothermic process, the phase and number of hydration products, as well as the micro-morphology and components were researched by XRD, TG, SEM, El）S, and etc test methods. The influence of fineness on the hydration property of circulating fluidized bed combustion fly ash was analysized. Results showed that re- action activity and effective components were improved by superfine grinding. The rates of anhydrite dissolution and exo- thermal reaction were increased by grinding, as well as the degree of hydration reaction. Problem of poor volume stability would also be solved by grinding.