The eucalyptus firewood is one of the main fuels used by the industries of red ceramic in the municipal area of Campos of Goytacazes, State of Rio de Janeiro. In principle this firewood has promising characteristics for addition into ceramics. Thus, the present work has for objective to characterize the ash generated from burning firewood aiming at its incorporation into red ceramic products. The ash was submitted to X-ray diffraction, chemical composition, particle size distribution, thermal analysis (ATD/TG), mercury porosimetry and scanning electron microscopy tests. The results showed that the ash of the firewood comes as agglomerates of particles, being constituted mainly by Ca, Si, Mg, K and S.
ash; firewood; red ceramics; characterization
