首页|Silica-alumina molar ratio and some factors effect on the synthesis of zeolites from fly ash
Silica-alumina molar ratio and some factors effect on the synthesis of zeolites from fly ash
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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 solu-tion, 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 so-dalite gradually, and nepheline is the synthesized intermediate product. Those results were discussed on the basis of a formation mechanism of zeolite from fly ash.
fly ashzeolitehydrothermal treatmentSi/Al molar ratio
SUN Yue-zhi、FU Ke-ming、ZHU Hong、ZHU Tian-lin
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Department of Biology and Chemistry, Jiaozuo Teacher's College, Jiaozuo 454003, China
Department of Chemical and Environmental Engineering, Jiaozuo University, Jiaozuo 454003, China
The Housing Development Company,Housing Management Bureau, Jiaozuo 454151, China
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