Abstract
Due to the great use of coal in the ironmaking plants and powerstations, it is very important to have a deeper knowledge of inorganic matter of this raw material. This study aims to identify the mineral phases responsible for the fluidity behavior of the coal ashes. Three differents types of coal were selected for this study. At first an identification of the mineral matter of the coals was done through the XRD. The ashes from the coals combustion were characterized through XRF chemical analysis and XRD. The rheologic properties were studied by the ash fusion tests in oxidant atmosphere. As an auxiliary tool in the fusibility tests, SEM was also used. The presence of different crystaline phases among the samples via XRD was also observed. The fusibility tests showed the different behaviour of the ashes in their respective temperatures of softening and fusibility. Concerning the studied coals, the illite and quartz phases tend to decrease the softening temperature. The phases rich in aluminium tend to increase the fusion temperature of the samples, whereas the presence of K, Na, Ca e Mg oxides in the formed phases contribute to the ashes fusibility.
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