Proceedings of the International scientific and practical conference ―Advances in Science and Humanity‖ (March 29-31, 2026) / Publisher website: www.naukainfo.com. – Vienna, Austria, 2026. - 176 p.

31 Keywords: dump blast furnace slag, elemental content, toxicity, class of a substance hazard, radioactivity, hydraulic activity. Introduction. Metallurgical slags accumulate in large quantities. For further disposal, they must have the necessary technical properties, chemical and mineral composition. Metallurgical enterprises adjust the quality of slag when choosing raw materials, optimizing the processing of liquid slag and the entire technological process [1]. Granulated blast furnace and steelmaking slags are used in civil and road construction, concrete and cement production, as reinforcing stones for hydraulic structures, during coastal stabilization as sorbents in wastewater treatment [2]. The effect of various cooling conditions on the properties of glassy steel slag in terms of their leaching and volume stability was studied [3]. The changes in the structure of steel slag reflect the process of gradual dissolution and reaction of lime with SiO2 to formation of 3CaO.SiO2 [4]. The dump blast furnace slag is not so thoroughly studied. They replace Portland cement in concrete materials aiming to increase durability and strength, conserve resources and save energy [5]. A study of the physical and chemical properties of blast furnace dust showed its suitability for asphalt mixtures in road construction [6]. In paper [7] the chemical composition, basicity, hydraulic properties, melting temperature, and surface morphology of the particles of blast-furnace and domed slag, which determine the differences in their use, are compared. In some cases, the hydraulic activity of dump blast furnace slag is sufficient for use in the manufacture of binders: pozzolanic cement, ash-slag-lime binder, additives to Portland cement [8, 9]. Hydraulic activity determines the use of slag. On the example of granulated blast furnace slags, a decrease in hydraulic activity over time is proved, the obtained analytical dependence allows us to determine the slag activity at a certain point in time [10]. The cooling method may affect the hydraulic properties of the slag, which correlate with the glass phase content. A higher concentration of amorphous compounds was recorded in slags cooled by water or liquid nitrogen [11]. The heat