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Mixture of fly ash and sodium hydroxide was calcined, which converted mullite (3Al2O3·2SiO2), the high-temperature stability phase containing silicon and aluminum oxides, and quartz into activated silica alumina phase, and they were dissolved by concentrated NaOH solution into soluble SiO3 and AlO2. The insoluble impurities including Fe2O3, FeO, CaO and CaSO4 were filtered out. Experiment results showed the optimum experimental conditions for the dissolution: temperature of 60C, 15% NaOH solution was used, liquid-solid mass ratio was 11:1, stirring time was 3 h, and about 78.9% of silicon and 78.1% of aluminum were dissolved. The obtained pure silicon aluminum solution provided the raw material for preparing high-purity molecular sieves, and Fe2O3 content of the prepared P type molecular sieve was only 0.25% and an CaO content was only 0.066%.

Melting and Dissolving Fly Ash by NaOH for the Removal of Iron, Calcium, and Other Impurities