Investigation of Glass Preparation by using Processed Nepheline Syenite from kaleibar area

Abstract

Abstract: In this study, the structure of Nephline (Neph) (including two minerals, syenite and microcline) was studied, using hydrothermal and milling methods by the 2.% mol. soda (NaNeph) and 30 wt.% lime(CaNeph), respectively. According to the X-ray diffraction and Raman spectra, the structure of the microcline phase in the (CaNeph) sample remained stable but the structure of Nepheline was somewhat degraded. The main characteristic XRD peaks of Syenite in the NaNeph sample at 28 o stayed compared to the CaNeph one. According to Raman spectroscopy the structural order of alumina-silicate rings in CaNeph sample was higher than Neph due to the milling and entering of the alkaline earth elements into the ring structure .Finally, Nepheline bearing glass samples with chemical composition of 6 wt% Al2O3 -65.5 wt.% SiO2- 13 wt.% Na2O- CaO 16.wt% were used. The amounts of used Nepheline in the glasses compositions were 25 to 38% by weight (depending on the final composition). The glass transition temperatures were 25 ,37 o C increased in GCaNeph and GNaNeph samples respectively. The chemical resistance of GCaNeph and GNaNeph glasses in the present work was 4 times higher than GNeph. The density of GCaNeph glass in the present work was 0.9 g/cm3 higher than GNeph.