Chemical, mineralogical and structural features of native and expanded perlite from Macedonia

Reka, Arianit and Pavlovski, Blagoj and Lisichkov, Kiril and Jasharia, Ahmed and Boev, Blazo and Boev, Ivan and Lazarova, Maja and Eskizeybek, Volkan and Orald, Ayhan and Jovanovski, Gligor and Makreski, Petre (2019) Chemical, mineralogical and structural features of native and expanded perlite from Macedonia. Geologia Croatica, Journal of the Croatian Geological Survey and the Croatian Geological Society, 72 (3). pp. 215-221. ISSN 1333-4875

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Chemical mineralogical and structural features of native and expanded perlite from Macedonia Geologia Croatica 72-3 215-221 2019.pdf

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Abstract

The physico-mechanical, chemical and mineralogical characteristics of volcanic glass (perlite) from the Mariovo region (Macedonia) as well as the mineralogical changes that occur during its thermal treatment were investigated to demonstrate its utilization for industrial use. The native perlite was characterized by chemical analysis, X-ray powder diffraction (XRPD), infrared (IR) spectroscopy, thermal analysis (TGA/DTA), scanning electron microscopy (SEM-EDX), transmission electron microscopy (TEM), and solid- state NMR. The chemical examination suggests that the perlite represents an acidic volcanic rock with a high percentage of SiO2 (72.45%), high in alkali metal oxides (4.21 wt.% K2O, 3.56 wt.% Na2O), with a loss of ignition 3.54 wt.%. Results from the XRPD indicated major amorphous behaviour, with low amounts of feldspars, quartz, and cristobalite. SEM examinations revealed glassy structure with presence of certain pores (dimensions ranging from 50–100 μm). The determined expansion coefficient was 20 times its original volume. XRPD of expanded perlite compared to the native perlite depicted new intensive peaks of cristobalite. SEM and TEM revealed irregular morphology with broken or ragged edges. On the basis of the chemical and mineralogical composition, the studied perlite is classified as an appropriate material suitable as ceramic flux to lower the sintering temperature.

Item Type: Article
Uncontrolled Keywords: perlite; volcanic rocks; chemical and mineralogical characterization; expansion coefficient
Subjects: Natural sciences > Earth and related environmental sciences
Natural sciences > Other natural sciences
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Biljana Kosturanova
Date Deposited: 04 Nov 2019 12:49
Last Modified: 04 Nov 2019 12:49
URI: http://eprints.ugd.edu.mk/id/eprint/22783

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