Assessment of possibility to synthesize zeolite a from coal fly ash
Keywords:
Fly ash, Zeolite, Thermal power, UltrasoundAbstract
USING ULTRASONIC-ASSISTED HYDROTHERMAL METHOD Zeolite A is one of the most famous zeolite types synthesized from coal-fired fly ash with many industrial applications such as an additive in washing powder, adsorption, pond cleaning, treatment of heavy metals, NH4+, desiccation, molecular sieve, etc. 20 kHzlow-frequency ultrasound can effectively replace other fly ash dissolution methods, as well as can effectively support crystallization of zeolite A crystals in a hydrothermal stage. Hydrothermal conditions with temperature >85 oC, SiO2/Al2O3 ratio in the solution of approximately 1 are suitable for synthesizing zeolite A. Hydrothermal time lasting up to 6 hours will produce hydroxy sodalite, reducing the efficiency of zeolite A synthesis. Preliminary experiments initially revealed the promising method in synthesizing highpurity, energy-saving zeolite A with a simple process.
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