abstract
The study concerns the recycling of the fly ash (FA) derived from the thermal power stations of Ptolemaida (Greece) and its potential use of this FA as precursor in production of bulk nucleated GCs. The first attempt was addressed to produce a glass from the fine powder of as received FA without any additives. To overcome some drawbacks such as spontaneous crystallisation upon cooling of FA based glass and to improve its working properties, production of pyroxene based glasses from FA was undertaken. The parent glass approached the composition of CaMg(0.75)Al(0.4)Fe(0.1)Si(1.75)O(6), derived from CaMg(0.75)Al(0.5)Si(1.75)O(6), which belongs to diopside-Ca-Tschermak solid solutions. Cr(2)O(3) nucleated fine grained mono mineral glass ceramics of augite were produced from the glasses comprising FA and additives of SiO(2), Al(2)O(3) and MgCO(3). The influence of Cr(2)O(3) content on the development of crystalline phases, the properties and the microstructure of the resultant glass ceramics crystallised at different temperatures was investigated.
keywords
RICH ANODIZING SLUDGE; BLAST-FURNACE SLAG; CRYSTALLIZATION BEHAVIOR; IMPEDANCE SPECTROSCOPY; INDUSTRIAL-WASTES; BODIES; SYSTEM; ALUMINA
subject category
Materials Science
authors
Vasilopoulos, KC; Tulyaganov, DU; Agathopoulos, S; Karakassides, A; Ribeiro, M; Ferreira, JMF; Tsipas, D
our authors
José Maria da Fonte Ferreira
Retired Professoracknowledgements
Konstantinos Vasilopoulos acknowledges the financial support of the Hellenic Ministry of National Education via the project 'Heracletos'. The support from CICECO, Department of Ceramics and Glass Engineering Department of University of Aveiro is also acknowledged.