Researches Regarding of Recovering Potential of Slag Components from Electric Steel Mills
Ilutiu – Varvara Dana Adriana, Pica Elena Maria, Brandusan L
The steelmaking process in the electric arc furnace causes environmental pollution in all its components: water, air and soil. The electric arc furnace steelmaking is considered to be an industrial process with high degree of pollution because solid wastes (slag, dust) and gaseous pollutants (carbon oxide, sulfur oxide, nitrogen oxide, volatile organic compounds, dioxins and furans) are generated. The paper presents an assessment of the recovering potential of slag components from electric steel mills. It presents the results obtained by chemical analysis of slag from steelmaking in the electric arc furnace. For this purpose, four slag samples were taken from an electric arc furnace having a capacity of 75 tones. The type of steel that has been made is carbon steel. In the analyzed slag samples there were identified the following compounds: silicon oxide (SiO2), lime (CaO), iron oxide (FeO), manganese oxide (MnO), magnesia oxide (MgO), chromium trioxide (Cr2O3), alumina (Al2O3), titanium dioxide (TiO2), vanadium oxide (V2O5) and phosphorus pentoxide (P2O5). From the analysis of solid waste one can conclude that by recovering the ferrous and mineral components of these waste, followed by their capitalization, it is possible to reduce the negative impact due to storage of these wastes in the environment.