Column leaching test were performed to evaluate the leaching of electric arc furnace dusts (EAFD), a multi-elements toxic waste, amended with ground granulated blast furnace slag (GGBFS) under dynamic conditions. The aim was to find a temporary solution to metals leaching. The use of GGBFS addition was divided into 4 categories;1) blended with EAFD, 2) applied on the surface of EAFD to create en alkaline wetting front, 3) applied at the base of EAFD, and 4) applied both on the surface and at the base of EAFD. Columns were fed three times weakly during 1 month. The concentration of metals (Cr-Ni-Pb-Zn), pH, conductivity, and Eh potential conditions were analysed in leachates. The results have shown that GGBFS applied at the base was the more efficient disposition. The Cr concentrations decrease according to reducing conditions and alkaline pH conditions.
展开▼
