Abstract: Fly ash was mixed with NaOH and heated at 850 ℃ for 3 h, the alkali-fused fly ash could be obtained. After several months of storage without any treatment, obtained materials were characterized by XRD and SEM. It was found that the alkali-fused fly ash has already been converted to hydroxy-sodalite. The zeolite was given birth to easily and economically comparing with the conventional hydrothermal reaction. The experiments indicate that synthesis of zeolite from fly ash is likely at room temperature or at open air.

Key words: zeolite;hydroxy-sodalite;fly ash;synthesis;room temperature