10.24411/1728-323X-2018-14134

Section

Environmentally sound technologies and innovations

Title

ANTIMONY SLAG LEACHING IN THE OXIDIZING MEDIUM TO OBTAIN ANTIMONY OXIDE

Сontributors

Zh. T. Tunguchbekova, junior researcher, Institute of Chemistry and Phytotechnolojy, National Academy of Science,

Bishkek, Kyrgyz Republic;

Z. K. Maimekov, Ph. D. (Engineering), Dr. Habil., Professor, Kyrgyz-Turkish University Manas, Bishkek, Kyrgyz Republic, This email address is being protected from spambots. You need JavaScript enabled to view it.;

D.       A. Sambayeva, Leading Researcher, Ph. D. (Engineering), Dr. Habil., Professor, Institute of Chemistry and Phytotechnolojy, National Academy of Science, Bishkek, Kyrgyz Republic;

U. Z. Maimekov, student, Moscow Institute of Physics and Technolojy, Dolgoprudny, Russia

Abstract

The article considers the dump antimony slag. Given the results of the atomic absorption and the semi-quantitative X-ray phase analyses, a complex phase composition of antimony slag has been identified, where antimony is found in the form of calcium antimonate CaNaSb2O6 (OH) and antimony hydroxide SbSb2O6 (OH) in antimony slag. Taking into account the elemental composition of slag, physical and chemical modeling of the destruction of the solid phase was carried out at a minimum of the Gibbs free energy. The equilibrium compositions were determined, and the concentration distribution of slag components and particles in the solution was found. The flow and direction of the process of destruction of antimony slag is confirmed by the enthalpy (AH < 0) and internal energy (AU < 0) of the system. It is noted that low-molecular components are formed during the decomposition of the antimony slag. It is established that the hydrogen index of the solution in the studied system has changed from 1.96 to 2.3, the reaction medium is acidic, antimony chloride is detected in the solution as a sludge. It is shown that in the process of leaching of antimony slag with sodium chloride (NaCl) in the medium of manganese (IV) oxide and sulfuric acid, the antimony sulfide in slag passes into antimony chloride, and further during its interaction with ammonium hydroxide (or sodium carbonate), oxide antimony (III), and oxidation of the latter with oxygen antimony pentoxide is produced.

Keywords

antimony, waste, slag, sodium chloride, oxide, manganese, sulfuric acid, distribution.

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