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Using the amorphous aluminosilicate in coal fly ash (FA), a single phase Na–A zeolite was synthesized from FA by dialysis. The FA and NaOH solution added into the tube made by semipermeable membrane were pretreated in the same NaOH solution at 85°C for 24h. After the pretreatment, the tube was removed and NaOH–NaAlO 2 solution was added into the residual solution to control SiO 2 /Al...
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