Mineralogical composition of boiler fouling and slagging deposits and their relation to fly ashes: the case of Kardia power plantMineralogical composition of boiler fouling and slagging deposits and their relation to fly ashes: the case of Kardia power plant Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-12-032011enSlagging and fouling deposits from a pulverized lignite fired steam generating unit of the Kardia power plant (West Macedonia, Greece) were mineralogically investigated. The structure and cohesion of these deposits varied, usually depending on the level height of the boiler unit where they were formed. Some of the deposits had complex phase composition. The dominant components of the deposits of the burner zone and of the lower and intermediate boiler zones were the amorphous, anhydrite and hematite, while those of the highest levels contained amorphous, and anhydrite. Furthermore, in deposits formed in various other boiler areas gehlenite, anorthite, diopside, quartz, Ca2SiO4, brownmillerite and other crystalline phases were also identified, usually in low amounts or in traces. The major part of the phases constituting the deposits were formed in the boiler, since only a minor part derived from the unreacted minerals present in lignite. Anhydrite was generated from the reaction of SO2 with CaO formed mainly by the calcination of calcite as well as from dehydration of gypsum contained in lignite, while hematite was produced mainly from the oxidation of pyrite. The calcium-containing silicates formed in the boiler were mainly the products of reactions between CaO and minerals contained in the lignite.http://creativecommons.org/licenses/by/4.0/Journal of Hazardous Materials1852-31012-1018 Kostakis Georgios Κωστακης Γεωργιος Elsevier Slagging Fouling Lignite fired boilers Kardia power plant