Voitenko Y. Increasing the level of environmental safety of sinter production by dedusting of gas emissions

Тhe thesis is devoted to the development of methods and means to prevent the receipt of dust in atmospheric air from sinter production based on the research of physical and chemical features of surface-active substance (SAS). The main sources of dust and ways to reduce dust emissions of the atmosphere are analyzed. Еcological problems of metallurgy industry in Ukraine, ecological and geographical features of the region where sinter plant JSC «ArcelorMittal Kryvyi Rih» is located, the harmful impact of industrial enterprises on the human body and living beings were considered; the analysis of existing methods for dust control at industrial enterprises with the use of surfactants was carried out. Sinter gases contain high dust content, the existing sinter treatment systems of our country do not provide sufficient efficiency of dedusting. To improve the efficiency, it is necessary to reduce the dust load on these systems and the content of fine dust. Тhe results of gas-pylodynamic researches in gas ducts of sintering machines were given, as wel as physical and chemical features of sinter dust were determined. It was proposed to improve the quality of sinter lumping by treating it before sintering with SAS solutions. As a result of studying physical and chemical features of surface-active substance, TEAC was selected as a foaming agent. The parameters of treatment of bulk mineral materials with SAS solutions are determined. The results of researches, the approbation of developed methods in industrial conditions prove the efficiency of applied methods for dedusting of air. Тhe research data of processing SAS loose materials while nodulizing of sinter charge was resulted; a mathematical model of SAS scattering over the conveyor belt was developed; the technology of loose materials processing by foam is developed; the results of sinter gases dustiness researches and dispersed composition of dust by introduction the treatment system for sinter charge by SAS at the sinter plant JSC «ArcelorMittal Kryvyi Rih» are given. The disease risk assessment of the population of residential areas in the zone under influencion of sinter production was carried out. The estimated disease risk will be reduced when TEAC solutions is used for sinter treatment, which will increase the level of environmental safety. Key words: ecological safety, sinter production, dust and gas emissions, dedusting, surface-active substance, atmospheric air, sinter, morbidity risk.