journal article·2025Open access

Calcined mullite powder produced from waste clay-diatomite

Aleksandra Saponjic, Jelena Maletaskic, Snezana Zildzovic, Zeljko Radovanovic, Maja Kuzmanovic, Sladjana Maslovara, Svetlana Ilic

Science of Sintering· Volume 57· Issue 4

Abstract

Mullite powders have been fabricated using diatomite powder as Si and Al-nitrate as Al precursors, without using any additives. Samples were calcined at three temperatures (1300, 1400 and 1500?C) for a period of 1, 2 and 4 h. The obtained powders were analyzed using X-ray powder diffraction analysis (XRPD) PSA (Particle Size Analysis), FESEM (Field emission scanning electron microscopy) and EDXS (Energy-dispersive X-ray spectroscopy). Content of the crystalline phases with calcination temperature and dwell time was computed by X-ray powder diffraction analysis (XRPD), using POWDER CELL software. Field emission scanning electron microscopy (FESEM) images confirmed that the rod shape morphology of mullite particles, with the diameters around 500 nm, and lengths, 5 ?m embedded in an amorphous matrix. XRPD of the sintered samples at 1300?C showed formation of thermally stabile phases (mullite, cristobalite and corundum) that makes the analyzed diatomaceous earth suitable for production of various types of construction and thermal insulating ceramic materials.
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Research context

OpenAlex topics: Recycling and utilization of industrial and municipal waste in materials production · Advanced ceramic materials synthesis

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Affiliations

”Vinča” Institute of Nuclear Sciences National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia

Central Laboratory for testing, Laboratory for chemical testing, Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia

Innovation Centre of the Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia

Group for biomedical engineering and nanobiotechnology, Institute of technical sciences of SASA, Belgrade, Serbia

Institute of General and Physical Chemistry, Belgrade, Serbia

Funding

Ministry of Education, Science and Technological Development of the Republic of Serbia

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