Systematization and selection of ecologically significant characteristics and indicators of metallurgical slags to the knowledge base of specialized GIS

Abstract

Purpose. The justification of environmentally significant indicators for information knowledge base of specialized GIS the formation to control and management of metallurgical slag waste. The research methodology provided for the scientific substantiation of the selection of certain ecologically significant characteristics and indicators of metallurgical slags on the basis of systematization and generalization of known data on their properties, as well as analysis of the values of certain indicators or ranges of their possible changes necessary to determine the resource potential of the slags and their environmental hazard. Research results. The concept of control and management of slag waste based on the corresponding specialized GIS is proposed. In its knowledge base, indicators and characteristics of steelmaking, cupola and the most massive – blast furnace metallurgical slag were selected. The resource potential of slags is envisaged to be assessed by the volume of their accumulation and the possibility of utilization or use in certain industries, and the environmental hazard – by chemical composition. Scientific novelty is as follows: - when determining the resource potential of slags, its mass in the dump is recommended to be determined by their volume obtained by GIS tools, taking into account the density of the slag material, on average – 2850 kg/m3 ± 5%. - the process of emission of iron and manganese into distilled water reaches a relative level of 0.95 already at the end of the first day and is maintained at the beginning of the third, after which it turns into a decreasing sigmoid curve, reaches an asymptote maximum value, after about a tenth day, and then changes little; the emission of vanadium and titanium in an aggressive solution has the form of an exponential. - the granulometric composition of slags, determines the volumes of its storage through the effect on the bulk density, it is proposed to characterize the minimum and maximum size of particles or lumps for waste slag – 1.6 mm and 250 mm, and for granulated blast-furnace slag and silicomanganese slag with an average median size of granules – 1.31 ± 0.15 mm and 1.54 ± 0.2 mm, respectively. Practical value. Specific values or ranges of possible changes in indicators of slags resource potential, as well as their environmental hazard to the environment by factors that, in aggregate, determine the migration of pollutants from the slag into waste water, have been determined, soil filtration, and emissions into the atmosphere.