Abstract
Converting coal fly ash (CFA) into zeolite is an alternative way to reduce the solid waste and produce high value-added products because CFA contains a large amount of Si and Al elements. Here we provide a novel method to synthesize NaX from CFA via a quasi-solid phase (QSP) conversion rather than classical hydrothermal method, in line with the principle of using and discharging as little water as possible. The pretreatment by HCl and NaOH, the effects of some important factors such as molar ratio of H2O to SiO2, seed amount, crystallization temperature and time were investigated to optimize the process. It’s exciting that the NaX with high crystallinity was obtained under optimal conditions when the molar ratio of H2O to SiO2 was only 8. In addition, the water retention performance of NaX in sand was studied, showing a possibility of desertification control using synthesized zeolite from CFA.
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