Silica-alumina molar ratio and some factors effect on the synthesis of zeolites from fly ash  

作　　者：SUN Yue-zhi FU Ke-ming ZHU Hong ZHU Tian-lin 

机构地区：[1]Department of Biology and Chemistry, Jiaozuo Teacher＇s College, Jiaozuo 454003, China [2]Department of Chemical and Environmental Engineering, Jiaozuo University, Jiaozuo 454003, China [3]The Housing Development Company,Housing Management Bureau, Jiaozuo 454151, China

出　　处：《Journal of Coal Science & Engineering(China)》2009年第4期430-433,共4页煤炭学报（英文版）

基　　金：Supported by the Henan Outstanding Youth Science Fund (0612002400)

摘　　要：In order to improve the activity and eliminate some impurities, pretreatment was used before hydrothermal synthesis. The fly ash was mixed with an aqueous NaOH solution, the alkali melted fly ash was also adopted, which is hydrothermally treated at about 104 ℃, and the liquid/solid ratio was controlled at 6：1. In order to control Si/Al molar ratio, SiO2 or Al2O3 powers were added to the fly ash. The results of XRD and SEM show that the alkali melted can activate fly ash and eliminate its quartz and mullite, along with the improvement of Si/Al molar ratio and alkalinity. In addition, zeolite Na-A changes into sodalite gradually, and nepheline is the synthesized intermediate product. Those results were discussed on the basis of a formation mechanism of zeolite from fly ash.In order to improve the activity and eliminate some impurities, pretreatment wasused before hydrothermal synthesis. The fly ash was mixed with an aqueous NaOH solution, the alkali melted fly ash was also adopted, which is hydrothermally treated at about104^(。)C, and the liquid/solid ratio was controlled at 6:1. In order to control Si/AI molar ratio,SiO_2 or AI_2O_3 powers were added to the fly ash. The results of XRD and SEM show thatthe alkali melted can activate fly ash and eliminate its quartz and mullite, along with theimprovement of Si/AI molar ratio and alkalinity. In addition, zeolite Na-A changes into sodalite gradually, and nepheline is the synthesized intermediate product. Those resultswere discussed on the basis of a formation mechanism of zeolite from fly ash.

关 键 词：fly ash ZEOLITE hydrothermal treatment Si/Al molar ratio 

分 类 号：TQ424.25[化学工程] TQ127.2