In this paper we combine the use of photo-thermal techniques, Thermal lens (TL)
spectrometry, Photoacoustic and heat capacity measurements to determine the optical path
dependence with temperature (ds/dT) of a polycrystalline 3C-SiC sample. Results obtained for the
polycrystalline sample with the TL technique show that ds/dT is negative at room temperature. This
means that the thermal lens formed in 3C-SiC acts as a divergent lens when light impinges the
sample. Our measurements, demonstrate that photo-thermal techniques can be used to obtain
thermal parameters in circumstances where other techniques cannot be used, for example, in harsh
environments.
Operation in an integrated steel making plant, such as the processing of iron ore by blast furnace result in several wastes that need to be conveniently disposed to avoid environmental pollution. In the case of sludge wastes, a feasible solution is their addition to clayey ceramics. The objective of this work was then to characterize a steel making plant waste was subjected to mineralogical, chemical and physical tests. The combustion gases: CO, CO2, NO and SO2from thermal emission were analyzed. It was found that the blast furnace sludge has a high content of both iron and carbon. Its combustion generates enough heat to sensibly contribute to the firing of the ceramic, which is an energetical advantage associated with the sludge waste addition. The gas emission was monitored and, for relatively small addition of waste, no harm is apparently caused to the environment.
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