Metallurgical Engineering and Consulting Ltd. (Tbilisi, Georgia):

G. V. Dzhandieri, Cand. Eng., Director, e-mail: gigo.jandieri@gmail.com

Abstract: The study was carried out in order to identify new organizational and economic opportunities for involving solid environmentally harmful metal-containing industrial waste stored at open landfills with zero residual value in the main production cycle. A comprehensive analysis of the issues and optimization criteria for a recycling system for such largetonnage metal-containing wastes of iron and steel, as well as ferroalloy production as scrap, scrap, scale, screenings, slag, dust, and sludge has been presented. It is noted that today the remelting of relatively environmentally friendly obsolete and usual scrap or ferroalloy screenings is the most profi table sphere of consumption of solid waste from metallurgical engineering. Therefore, at this stage, it is possible to diagnose the efficiency of recycling metal waste solely by the indicator of savings from replacing the conversion steel products or ore concentrate consumed in the main production. To evaluate this indicator, it is recommended to apply the methodology of reduced costs taking into account such basic variables as type, metallurgical value and contamination of raw materials to be remelted. In turn, to diagnose the efficiency and optimize the system of recycling metal-oxide wastes, a methodology has been developed to determine the total efficiency index, which includes both economic, environmental and social components of the assessment, as well as the efficiency indicator of the applied innovative technologies and the coefficient of useful use of these wastes. It is proved that the organizational and economic system for recycling of metal-oxide waste can be optimized if the content of metals extracted from the waste included in the internal production cycle as a result of combining and averaging over the chemical composition is brought to the lower extremum acceptable from the point of view of threshold profi tability and thus ensures the possible increase in the volume of processing and useful use of waste. It is shown that the rational way of recycling the oxide waste is to process it together with the ore raw materials with a partial replacement of the latter. This leads to signifi cant savings in the consumption of ore concentrates, reduces the cost of production, increases the overall profi tability and environmental and economic efficiency of the enterprise.

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