Caracterização de resíduos industriais visando a seu aproveitamento na fabricação de aço

Abstract

This paper involves the characterization of marble waste, steelmaking fine sludge and aluminum dross, to ascertain the technical feasibility of using these in the desulfurization and dephosphorization of hot metal. The characterization of these residues was done taking into consideration: Chemical analysis, particle size, X-ray diffraction results and scanning electron microscopy (SEM) with Energy Dispersive Spectrometry (EDS) data analyses. The steelmaking fine sludge has a FeO content of 84.90%, the marble waste lodged content of 61.5% CaO and 33.9% MgO, and aluminum dross 36.5% of Al metal and 62% of Al2O3. The particle size of marble waste had of the average grain size equal to 42.8 μm, in aluminum dross the average size was 101.8 μm and steelmaking fine sludge showed around 54.7% of its grain size between 0.15 and 0.075 mm. These results indicate the feasibility of using these materials in the desulfurization and dephosphorization of hot metal.