Recently the awareness on the ambient preservation plays an important role in the industrial sector. The ceramic industry seeks, as an alternative of economy and preservation, the aggregation of diverse industrial residues. However, there is the concern with the pollutant gas emission in the clay firing process This work had the objective of analyzing gas emissions during firing the mixture of the clay from Campos dos Goytacazes, RJ, Brazil with different concentrations residue of steel slag in the LD (Linz Donawitz) process of steel refining. The samples contained slag concentrations with 0, 5 and 10%. During firing, CO2 and CO gases had been detected using photothermal technique. There is a sharp CO2 peak at 800 ºC in the firing of clay with 10% residue, probably due to calcite dehydroxilation, in relation to pure clay.
gases; red ceramics; steel slag; photothermal technique
