Abstract
Ca-bentonite can be converted into zeolite A via hydrothermal alkaline treatment by varying the synthetic parameters. This paper focuses on the effects of SiO2/Al2O3 molar ratio, Na2O/SiO2 molar ratio, reaction temperature, reaction time on the synthesis of zeolite A. Phase-pure zeolite A was synthesised under optimum conditions of 3Na2O:0.25Al2O3:1SiO2:150H2O by heated at 90°C for 12 h, whose shape and average crystal sizes are the cube of 1∼3 μm by the SEM micrograph. Compared with chemical synthesis method, one-step alkali fusion method has the advantages of low cost, simple operation, short time etc, which are worthy of further consideration in industrialization.
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