Physical chemistry of some slag and glass systems useful in recycling

Abstract

Two projects were carried out to determine whether steelmaking slags and dust might be processed into value added products, simultaneously reducing the total cost of making steel and eliminating potential environmental problems. In the first project, steelmaking slag was oxidized to determine if the cementitious nature of the CaO-SiO2 in the system can be enhanced by converting the basic FeO in the slag to the amphoteric Fe2O3. In the second project, the ability of the CaO-MgO-SiO2 to form commercially useful glasses at high contents of Fe2O3 and ZnO, typical of certain steelmaking dusts, was examined at a constant level of SiO2.