The chemical and mineralogical composition of fly ash samples collected from different parts of two Circulating Fluidised Bed (CFB) facilities has been iníestßgated. The fuels used, were Greek xylite/subbituminus coal (from the Florina basßn) Polish coal (from the Catowise region - Poland) and wood chips (Swedish conifer). Ôhe characterisation of the fly ash samples included chemical analyses, particle size distribution and ×-Ray diffraction. According tï the chemical analyzes the produced fly ashes is rich in CaO. Moreover, SiO2 is thE dominant oxide in fly ash with Al2O3 and Fe2O3 found in considerable quantities. Finally, results obtained by XRD showed that the major mineral phase of fly ash is quártz, while other mineral phases that are occurred are maghemite, hematite, periclase, rutile, gehlenite and ánhydrite,while the aforementioned mineral phases were identified by scanning election microscope (SEM).

Keywords: CFB fly ash, bituminous coal, xylite/Subbituminous coal/wood chips