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.

33 the slag matrix; therefore, their concentration in soils near slag dumps is lower than in slag [23]. Slags of various origins are concentrators of natural radionuclides (NR). The possibilities of using metallurgical slag in civil and road construction according to radioactivity indicators are shown [24]. The concentrations of NR: U, Th, and K in the slags of iron and steel production can be compared with the radioactivity of limestone and dolomite. It was determined that the activity of NR is below the maximum allowable levels established by the norms of Romania [18]. For waste blast furnace slag (UK) there is 210Pb <50 Bq/kg, 226Ra – 240 Bq/kg [17]. The purpose of the research is to study the toxicity and hydraulic activity of Zaporizhstal dump blast furnace slag as the parameters determining the slag resource value. The objectives of the research are to study the elemental and radionuclide composition of dump blast furnace slag to determine the hazard class and the hydraulic activity of the slag. Research methodology . The elemental composition of dump waste blast furnace slag are determined by means of the method of electron probe microanalysis by the JSM-6390 LV scanning electron microscope having the INCA microroentgen analysis system. The gamma-ray spectrometric analysis of slag is carried out with the scintillation gamma-ray spectrometer SEG-001. The identification of the acidity of slag particle surface layers is made with the pH-meter–the millivoltmeter that contains a hard phase selective electrode and a modified reference electrode in polypropylene cases. Hydraulic activity has been determined by the amount of the absorbed lime CaO [25]. Elemental composition of dump waste blast furnace slag . According to the results of the electron probe microanalysis, the elemental composition of slag fractions is calculated (Table 1). It reflects the general content of the elements which enter the composition of crystalline and amorphous substances.