Maximum values of 2.7 107 part. cm3 and 2.0 103 part. cm3 were found, respectively, for number
concentration before and after the fabric filter showing a very high efficiency in particle removing by the
fabric filter. With regard to heavy metal concentrations, the elements with higher boiling temperature
present higher concentrations at lower diameters showing a not complete evaporation in the combustion
section and the consequent condensation of semi-volatile compounds on solid nuclei. In terms of mineralogical
and morphological analysis, the most abundant compounds found in samples collected before
the fabric filter are Na–K–Pb oxides followed by phyllosilicates, otherwise, different oxides of comparable
abundance were detected in the samples collected at the stack.