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HYDROTHERMAL ACTIVATION OF FLY ASH FROM BROWN COAL COMBUSTION
Abstract
In Poland, like in many other countries, research is conducted toward creating sorbent materials based on fly ashes. The present shows the synthesis of fly ash from brown coal combustion in pulverised-fuel boilers of the Be?chat?w Power Plant. The synthesis was conducted in an autoclave using the hydrothermal method with alkaline activation. The conditions for the synthesis were: temperature of 170В°C, NaOH aqueous solution. The chemical composition of the fly ash as well as the products of the synthesis was determined using the X-ray fluorescence (XRF), while the X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive X-ray spectrometry (SEM/EDS) were used for determining mineral composition. The dominant chemical constituents of the ash were SiO2, Al2O3, CaO, which together constituted over 80%mas. Due to the fact that the fly ash contains small amounts of alkalis (the sum of Na2O and K2O does not exceed 0.30%mas.), alkaline activation was achieved using a NaOH solution. The mineral composition of the fly ash analysed consisted of: quartz, gehlenite, mullite, hematite, feldspars (anorthite), lime, anhydrite, ZnO phase, pyrrhotite, and amorphous substance (glass and uncombusted organic substance). As a result of the synthesis a material was obtained whose dominant constituent are Ca and Na aluminosilicates (tobermorite, nosean and gehlenite).
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