Effect of Thermal Treatment of Trepel at Temperature Range 800-1200˚C

Reka, Arianit and Pavlovski, Blagoj and Ademi, Egzon and Jashari, Ahmed and Boev, Blazo and Boev, Ivan and Makreski, Petre (2019) Effect of Thermal Treatment of Trepel at Temperature Range 800-1200˚C. Open Chem (Impact Factor 2018: 1.512 / 5-year Impact Factor: 1.599), 17. pp. 1235-1243.

[thumbnail of Open Chemistry - Effect Of Thermal Treatment Of Trepel.pdf]
Open Chemistry - Effect Of Thermal Treatment Of Trepel.pdf

Download (9MB) | Preview


Trepel is the local name for a mixture of diatomaceous earth and clay minerals. It represents a greyish, soft, very light, weakly cemented, fine biogenetic sedimentary rock. The studied material is taken from the vicinity of Bitola city (Republic of Macedonia). Here, trepel was treated up to three temperature intervals (800, 1000 and 1200ºC) for a period of 1 hour. The X-ray powder diffraction results indicate the presence of both an amorphous phase and the following crystalline phases: quartz, feldspars (plagioclase), mica (muscovite) and chlorites. The results of SEM analysis revealed skeletons of alga Diatomeae with nano-pores. By thermal treatment of the samples, a gradual change in color as well as higher bulk density and compressive strength was observed. The increase of the temperature, in addition, affected the mineralogical composition and increased the presence of the amorphous phase (aluminasilicate glassy phase). SEM results of the thermally investigated samples depicted morphological changes expressed by shrinkage of the pore diameters in comparison to the initial material. The major and minor constituents were established by chemical analysis revealing the following chemical composition of raw trepel: SiO2 (63.65 wt%), Al2O3 (11.76 wt%), Fe2O3 (5.93
wt%), MnO (0.13 wt%), TiO2 (0.63 wt%), CaO (1.42 wt%), MgO (2.22 wt%), P2O5 (0.11 wt%), K2O (1.63 wt%), Na2O (0.92 wt%), LOI (11.50 wt%).

Item Type: Article
Impact Factor Value: 1.599
Uncontrolled Keywords: Trepel;diatomaceous earth; clay minerals; characterization; thermal treatment.
Subjects: Natural sciences > Chemical sciences
Natural sciences > Earth and related environmental sciences
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Biljana Kosturanova
Date Deposited: 14 Jan 2020 09:39
Last Modified: 14 Jan 2020 09:39
URI: https://eprints.ugd.edu.mk/id/eprint/23407

Actions (login required)

View Item View Item