โ Scribed by Vassiliki Sakorafa; Kleopas Michailidis; Francesco Burragato
No coin nor oath required. For personal study only.
Results are given on the mineralogy, morphology, geochemistry and physical characteristics of fly ash from the Megalopolis lignite fields, Peloponnese (S. Greece). The main mineral species present are quartz, anhydrite, plagioclase, haematite, gehlenite and calcite. Also present, in minor and trace amounts, are lime, alkali feldspars, bassanite, gypsum, mica and unburnt lignite. Morphologically, fly ash consists of irregularly shaped, oval and spherical particles, of widely varying sizes. Chemically, the fly ash samples examined fall in the pozzolan field in the triangular diagram CaO-Si02-Al,Os.
The trace elements As, Cd, MO and Se, and Ni, V and Zn, of great and moderate environmental concern respectively, occur in concentrations higher than the respective Clarke values. Ash fusion temperatures vary within the range 1257ยฐC (initial deformation temperature) to 1339ยฐC (flow temperature) on average. Fouling and slagging parameters of the ash are within the preferred ranges of empirical practice. The chemistry of the fly ash reveals properties of concern to the construction industry, to the prediction of lignite-fired boiler performance and to health and environment.
๐ SIMILAR VOLUMES
## Morphological and elemental characteristics of fly ash from lignites in Ptolemais coalfield, Northern Greece, were studied using scanning electron microscopy and inductively coupled plasma. Morphologically, fly ash consists of irregularly shaped, oval and spherical particles. Plerospheres, ceno