Využití bodové analýzy prováděné metodou rentgenové fluorescenční spektrometrie ke studiu vzájemných asociací prvků v nedopalu

Abstract

This thesis deals with the use of wavelength-dispersive X-ray fluorescence spectrometer (equipped with mapping function) for measurement of the elemental distribution within the grains of unburned carbon separated from bottom ashes after fluidised-bed coal combustion. Mutual binding associations of the elements in these unburned carbons were evaluated by means of correlation coefficients calculations. High values of correlation coefficients and similar distribution profiles were found for Al, Si, O, K and Mg, which can be explained through joint occurrence of these elements in aluminosilicate minerals, and between Ca and S (these elements can be bound jointly e.g. in anhydrite / gypsum). Similar measured profiles were obtained also for Fe and S (joint occurrence of these elements in sulphides or disulphides) and between Mg and Ca (these elements are often bound in carbonates, such as dolomite). As there was also LA-ICP-MS profile available for 2 unburned carbons, the results obtained by means of both methods could be compared as well.