Эффективность использования доменного шлака для очистки кислых стоков предприятий горно-промышленного комплекса

Abstract

The article considers the possibility of using blast-furnace slag to treat acid mine drainage of mining and industrial complex enterprises from various pollutants, and in particular, from heavy metals. There was studied sorption capacity of blast furnace slag with respect to heavy metals from acidic wastewater, its physical and chemical properties and composition. The structure and composition of the surface of the studied material were examined using a JEOL JSM-6460 LV electron microscope with an attachment for micro-X-ray spectral analysis, and the chemical composition of the sorbate and its changes depending on the research conditions were studied using atomic emission spectrometer OPTIMA 2100DV with inductively coupled plasma. Analysis on the electron microscope has shown that the blast-furnace slag samples have a porous structure with the pore diameter of 0.15-0.88 µm. There has been determined the sorption capacity of the blast-furnace slag in static conditions with varying temperatures.It has been found out that the effectiveness of wastewater treatment with the use of blast-furnace slag varies from 71 to 100 % in static conditions and from 5 to 100% in dynamic conditions depending on the nature of the cations of the metals in the wastewater, the sorbate temperature, and filtration speed. In the process of sorption, there occurs alkalinization of wastewater. In the dynamic testing mode, the pH index raises from 2.38 to 3.33-3.39 at consumption of sorbate of 0.6-2.64 l/per hour and up to 5.62 at the at sorbate consumption of 0.3 l/per hour.