[01] Seyed Ali Hosseini, Department of Applied Chemistry, University of Urmia, Urmia, Iran.

Nepheline syenite is a feldspathoid and can be both source of Si and Al sources in synthesis of zeolite 4A, but high ratio of Si/Al in nepheline syenite leads to use other Al sources. This paper reports the synthesis conditions of zeolite 4A from nepheline syenite by hydrothermal method. Before synthesis of zeolite, the nepheline syenite was calcined at 900 ˚C to transform the phase and then treated with magnetic separation and acid leaching (0.1 M HCl) to remove the iron compounds from nepheline syenite. The aging of nepheline syenite was carried out under optimum conditions of time, stirring rate, and temperature of 90 min, 1200 rpm and 90 ˚C, respectively. In order to synthesize the zeolite 4A, a mixture of nepheline syenite, sodium aluminate, and distillated water were used and the ratios of SiO2/Al2O3, Na2O/Al2O3 and H2O/Al2O3 in the mixture was set at 2, 5 and 35, respectively. The chemical composition of nepheline syenite and zeolite NaA were determined by wet AAS, XRF, and characterizations were carried out by XRD, FTIR, Dynamic Laser Scattering (DLS). The analysis results approved the production of zeolite A from nepheline syenite.

Nepheline Syenite, Zeolite A, Sodium Aluminate, Hydrothermal

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