高铝粉煤灰加碱煅烧活化实验研究

研究了以氢氧化钠为助剂活化高铝粉煤灰的煅烧工艺。采用SEM扫描电镜观察了高铝粉煤灰显微状态下的形貌,X射线衍射表征高铝粉煤灰以及不同煅烧条件下所得产物的物相组成,得出高铝粉煤灰煅烧活化最佳工艺条件为：煅烧温度为850℃,保温时间为2 h,粉煤灰与氢氧化钠的质量比为1∶1.2。煅烧后的产物主要为可溶性的硅铝酸钠（Na Al Si O4）和硅酸钠（Na2Si O3）,原高铝粉煤灰中的石英、莫来石相基本消失,粉煤灰得到充分活化。

Experiment Research on the Calcination Process of Activating High-alumina Fly Ash with NaOH

The calcination process for activating high-alumina fly ash with NaOH as accessory ingredient was investigated. The micro appearance of fly ash was watched by SEM and the phase composition of high-alumina fly ash and resulting products under different calcining conditions were characterized by XRD. The optimum process parameters were obtained as follows： calcination temperature was 850 ℃, holding time was 2 h, and mass ratio of fly ash and NaOit was 1：1.2. The products after calcination were mainly made up of soluble NaA1SiO4 and Na2SiO3 and the quartz and mullite in the raw high-alumina fly ash both almost disappeared. Therefore, the high-almnina fly ash was activated adequately.