Coal fly ash was modified to zeolitic materials by hydrothermal treatment at 90 oC. The zeolite synthesis was studied as a function of the mole ratio of Na2O/SiO2 in the reaction mixtures. The results showed that NaP1 zeolite is obtained when the Na2O/SiO2 mole ratio was 0.7. Hydroxysodalite is the dominant zeolite phase in modified fly ash treated with a higher Na2O concentration solution (Na2O/SiO2 = 1.3). The IR and XRD methods were used to determine the phases present in the starting sample and in the zeolitic materials.
Sample of nonmagnetic fraction of fly ash "Nikola Tesla-B" power station was used for zeolite synthesis experiment Quartz and amorphous phase as aluminosilicate glass were main phases in this sample. After zeolitization under some hydrothermal conditions in the new product were also detected quartz and new phases A zeolite and some amount of hydroxysodalite. IR and XRD methods were used to determine phases present in the starting and zeolitic material.
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