Summary:

Industrial wastes are generated in production processes, as well as in wastewater or gases treatment processes. Implementation of more stringent normatives for the levels of wastewater or gases treatment automatically leads to greater amounts of solid waste generated, e.g. as dusts or depositions retained in dust cleaning devices, scrubbers or dirt traps. This paper presents the results of research on possibilities of using hazardous waste (fly ashes from pit-coal combustion and flotation tailings from copper ore mine) as components of solidifying-binding mixture used for neutralizing galvanic sludges in stabilization/solidification technology (S/Z). The effect of hydrated lime on the course of processes of galvanic sludge (G) neutralization is also presented. For the purposes of our experiments two solidifying-binding mixtures were prepared: A, being a compilation of Portland cement (C), fly ashes from pit-coal combustion (PL) and flotation tailings from copper ore mine (OF); and B, where the dose of flotation tailings was reduced by half, with addition of the same amount of hydrated lime (WH). The effectiveness of galvanic sludge stabilization process was evaluated on the basis of measurements of axial compression strength, as well as of chemical analysis of eluates from heavy metals leaching test.