Distribution of antimonium chalcogenides under conditions of vacuum thermal processing of mattes
Volodin V.N. Trebukhov S.A. Nitsenko A.V. Burabayeva N.M. Linnik X.A.
12 October 2023Institute of Metallurgy and Ore Beneficiation JSC
Kompleksnoe Ispolzovanie Mineralnogo Syra
2023#326Issue 388 - 95 pp.
It was established based on the analysis of the results of published works and the results obtained by the authors that there is no information on the behavior and distribution of antimony chalcogenides - Sb2S3, Sb2Se3, Sb2Te3, as well as double systems - Sb2S3-Sb2Se3, Sb2S3-Sb2Te3 and Sb2Se3-Sb2Te3 underthe vacuum processing conditions for polymetallic mattes performed at 1100 1250 °C and a vacuum of 15 - 0.7 kPa. It was found based on the saturated vapor pressure values for monochalcogenides that the vapor pressure of free antimony sulfide will be 58.95 kPa at 1100 °C, i.e. the lower limit of the technological interval, which indicates its complete transfer to the vapor phase when the mattes are evacuated; the vapor pressure of free antimony selenide at 1100 °C exceeds the atmospheric pressure value (101.3 kPa), and Sb2Se3 would be completely extracted into the vapor phase in vacuum; the boiling point of liquid antimonytelluride at atmospheric pressure corresponds to 971 °C, and itwould be extracted into the vapor phase under the conditions ofmatte evacuation. The thermodynamic evaporation characteristicsof antimony chalcogenides were found. It was concluded based onthe location of the boundaries of the liquid and vapor phase coexistence fields that it is impossible to separate binary systems of antimony chalcogenides into separate compounds in the process of one evaporation cycle – condensation, in binary systems.Different effects of pressure reduction over melts were found. Lowering the pressure from atmospheric one to 0.7 kPa inSb2S3-Sb2Se3 system did not change the position of the boundaries ofthe liquid and vapor fields (L + V) under the temperature; field width (L+V) decreases with decreasing pressure in Sb2S3-Sb2Te3 system; the field width first decreases with temperature, then increases in system Sb2Se3- Sb2Te3. At the same time, the position of the boiling curves of antimony chalcogenide solutionsindicates the complete transfer of compounds into the vapor phase under the conditions of matte distillation processing(at 1100-1250 °C) at atmospheric pressure which is important forassessment of the distribution of antimony and rare metals - seleniumandtellurium by processed products.
antimony , chalcogenide , distribution , matte , sulfur , tellurium , thermodynamics , vacuum , vapor pressure
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Institute of Metallurgy and Ore Beneficiation JSC, Satbayev University, Almaty, Kazakhstan
The Institute of Nuclear Physics, Almaty, Kazakhstan
Institute of Metallurgy and Ore Beneficiation JSC
The Institute of Nuclear Physics
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