DOI

10.24411/1728-323X-2018-15059

Section

Geoecology

Title

POSSIBILITIES OF PROCESSING DUMP SLAGS AS RAW MATERIAL OF TECHNOGENIC ORIGIN

Сontributors

Zh. T. Tunguchbekova, assistant researcher, Institute of Chemistry and Phytotechnology, National Academy of Sciences of the Kyrgyz Republic, Bishkek, Kyrgyzstan;

D. A. Sambaeva, Leading Researcher, Doctor of Technical Sciences, Professor, Institute of Chemistry and Phytotechnology, National Academy of Sciences of Kyrgyzstan, Bishkek, Kyrgyzstan, This email address is being protected from spambots. You need JavaScript enabled to view it.; 

Z. K. Maimekov, Doctor of Technical Sciences, Professor, Kyrgyz-Turkish University "Manas", Head of the Department, Bishkek, Kyrgyzstan This email address is being protected from spambots. You need JavaScript enabled to view it.;

A.Z.Ukeleeva, Researcher, Institute of Chemistry and Phytotechnology, National Academy of Sciences of the Kyrgyz Republic, Bishkek, Kyrgyzstan

Abstract

The article gives a brief review of the literature on the processing of metal slag wastes: ferrous, lead, zinc, cobalt, antimony, zirconium, fluoride, hydrated, sulfuric, arsenic-calcium, copper-sulfide, iron-thorium, tin, zinc-bearing, gold-containing slags in order to reduce losses of recoverable metals from leachable solutions. The possibility of their processing by fusible and multi-acid leaching in oxidizing environment is highlighted. It is emphasized that the dump slags are multicomponent and are found in the form of technogenic formation, therefore the problems of minimization of environmental pollution by wastes, including antimony production, are of great ecological importance. In particular, the assessment of environmental risk in the soils of the antimony mining area, the prevention of the leakage of the used electrolytes into groundwater, as well as a decrease in the absorption of antimony waste by plants and soil require systematic scientific and practical research. Taking into account the circumstances mentioned above, in the paper it has been established that antimony occurs in the antimony cakes of the Kadamjai antimony plant’s slag as calcium antimonate CaNaSb2O6 (OH), antimony hydroxide SbSb2O6 (OH), and the total antimony content in the slag is 4.5%. The physicochemical modeling of the oxidative destruction of the surplus slag at the maximum of the entropy of the system was carried out, equilibrium compositions were determined, and the concentration distribution of the components and particles in the gas phase was found. The flow and direction of the process of destruction of antimony slag is confirmed by the enthalpy (ΔH <0) and internal energy (ΔU <0) of the system. It is identified that low-molecular components, radicals, ionic particles and condensed phases are formed during the decomposition of antimony slag. The concentration dependence of the main antimony-containing compounds, including antimony oxides, on the temperature of oxidative destruction of antimony slag was found. It is shown that condensed antimony oxides based on antimony slag are formed within the temperature range of 1098-1248K.

Keywords

ore, processing, waste, slag, technogenic raw materials, entropy, antimony, distribution

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