Fabrication of ceramic monoliths from diatomaceous earth: effects of calcination temperature on silica phase transformation-Reference-Cited by-同舟云学术

Fabrication of ceramic monoliths from diatomaceous earth: effects of calcination temperature on silica phase transformation

Published:2022 Issue:4 Volume:54 Page:495-506
ISSN:0350-820X
Container-title:Science of Sintering
language:en
Short-container-title:SCI SINTER

Author:

Reka Arianit¹,Kosanovic Darko²^ORCID,Ademi Egzon³,Aggrey Patrick⁴,Berisha Avni⁵,Pavlovski Blagoj⁶,Jovanovski Gligor⁷,Rexhepi Besnik³,Jashari Ahmed³,Makreski Petre⁸

Affiliation:

1. Faculty of Natural Sciences and Mathematics, University of Tetovo, Tetovo, North Macedonia + Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, USA + NanoAlb-Unit of Albanian Nanoscience and Nanotechnology, Albanian Academy of Sciences, Tirana, Albania

2. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, USA + Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade, Serbia

3. Faculty of Natural Sciences and Mathematics, University of Tetovo, Tetovo, North Macedonia

4. Hierarchically Structured Materials, Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Moscow, Russia

5. NanoAlb-Unit of Albanian Nanoscience and Nanotechnology, Albanian Academy of Sciences, Tirana, Albania

6. Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University in Skopje, Skopje, North Macedonia

7. Macedonian Academy of Sciences and Arts, Research Center for Environment and Materials, Skopje, North Macedonia

8. Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University in Skopje, Skopje, North Macedonia

Abstract

The raw diatomaceous earth from the vicinity of Bitola (North Macedonia) showed low bulk density (0.61-0.69 g/cm3), high-water absorption (75-81%) and porosity (66- 72%). The chemical composition was determined with ICP-MS, revealing the following results for the diatomaceous earth: SiO2 (63.69 wt%), Al2O3 (11.79 wt%), Fe2O3 (5.95 wt%), MnO (0.15 wt%), TiO2 (0.65 wt%), CaO (1.51 wt%), MgO (2.24 wt%), P2O5 (0.13 wt%), K2O (1.64 wt%), Na2O (0.93 wt%), LOI (11.21 wt%). XRPD data of the examined sample of clayey diatomite mainly depicted crystalline behavior with a small presence of amorphous phase. The crystalline mineral phases mainly comprise: silica (quartz), feldspars (plagioclase), mica (muscovite), chlorites and dolomite. SEM and TEM results show cased presence of micro- and nanostructures with pores ranging from 250 to 600 nm. The clayey diatomite was sintered at three temperatures (900, 1000 and 1100?C) for a period of 1 h. XRPD of the sintered samples at 1100?C showed certain thermal stability and formation of new phases (mullite and tridymite) that makes the analyzed diatomaceous earth suitable for production of various types of ceramic, construction and thermal insulating materials.

Publisher

National Library of Serbia

Subject

Materials Chemistry,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites

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