The influence of vitreous waste entropy on sintering process

Autor:	M. Kosmal, Paweł Pichniarczyk, Karol Rzepa, Wojciech Wons, Manuela Reben
Rok vydání:	2021
Předmět:	Glass recycling Materials science Metallurgy Iron oxide Slag Sintering Raw material Condensed Matter Physics chemistry.chemical_compound Devitrification chemistry visual_art Fly ash visual_art.visual_art_medium Ceramic Physical and Theoretical Chemistry
Zdroj:	Journal of Thermal Analysis and Calorimetry. 146:2199-2207
ISSN:	1588-2926 1388-6150
DOI:	10.1007/s10973-021-10747-w
Popis:	There is a fairly large range of waste that is partially or fully vitrified e.g.,: fly ashes, granulated slag, glass cullet. As long as they are not loose, after milling these wastes are an interesting raw material for the production of sintered ceramics. In this application, attention is usually paid to their fluxing effect during sintering, due to the high content of alkali oxides and iron oxide. The high entropy of these raw materials resulting from the large proportion of glassy phase is usually neglected. In this paper, we shown that during the sintering of glassy wastes their entropy decreases, which is mainly the result of their devitrification and previous glass transformation. Both the sintering process and the processes associated with the drop in glass entropy are exothermic. Their simultaneous coexistence causes that they can accelerate each other. The influence of high entropy of vitreous wastes on the acceleration of the sintering process was demonstrated with use of thermal studies such as DTA/TG and high temperature microscopy. The fly ash, ground cullet and their mixture were used as glassy wastes.
Databáze:	OpenAIRE
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