Grant financing of young scientists for scientific and (or) scientific-technical projects for 2021-2023

АР09058077

«Thermodynamic studies of melts and the vapor phase in binary systems of aluminum with tellurium, selenium, and sulfur in the conditions of distillation refining of elements”

Project Manager: Burabaev N.M.

АР09058077 «Thermodynamic studies of melts and the vapor phase in binary systems of aluminum with tellurium, selenium, and sulfur in the conditions of distillation refining of elements”

Project Manager: Burabaev N.M.

Relevance: The significance of the work lies in obtaining new reference data on binary systems, with the construction of complete phase diagrams, including vapor-liquid equilibrium, which are currently absent. The results obtained are aimed at creating fundamental foundations for the technology of distillation processes and at issuing effective practical recommendations necessary for the development and improvement of the chalcogen refining process. Investigations of vapor-liquid equilibrium of metals and non-metals at high temperatures and low pressure in the near and far abroad are not carried out.

Project goal: Obtaining the currently absent thermodynamic constants of the condensed and vapor phases of binary systems of aluminum with tellurium, selenium, and sulfur, as well as the construction of liquid-vapor phase transitions at low pressure, which makes it possible to theoretically substantiate the causes of technological difficulties in the purification of selenium and tellurium from impurities in obtaining high-purity elements.

Expected results.

- The thermodynamics of the aluminum – tellurium system will be investigated with the correction of the phase diagram and the thermodynamic constants of the condensed and vapor phases as well as aluminum sesquitellluide will be determined;

- The thermodynamics of the aluminum-selenium system will be investigated with the correction of the phase diagram and the thermodynamic constants of the condensed and vapor phases as well as aluminum sesquislenide will be determined;

- The thermodynamics of the aluminum-sulfur system will be investigated with the correction of the phase diagram and the thermodynamic constants of the condensed and vapor phases as well as aluminum sesquisulfide will be determined.

Based on the research results, 2 articles will be published in peer-reviewed scientific journals in the scientific direction of the project, indexed in the Science Citation Index Expanded of the Web of Science database and (or) having a CiteScore percentile in the Scopus database of at least 35 (thirty five), as well as 1 article in peer-reviewed foreign or domestic edition recommended by COXON.

- either 2 articles in peer-reviewed scientific journals in the scientific direction of the project, included in 1 (first), 2 (second) or 3 (third) quartiles in the Web of Science database, as well as 1 article in a peer-reviewed foreign or domestic edition recommended by Committee for Quality Assurance in Education and Science of the Ministry of Education and Science of the Republic of Kazakhstan.

Achieved results: For the first time, complete diagrams of the state of aluminum with tellurium have been completed, including three aggregate states of matter, on the basis of which one can judge the possibility, or lack thereof, of refining chalcogenes from aluminum and its compounds. The novelty of the work: For the first time, a complete state diagram was constructed, including the fields of vapor-liquid equilibrium, at atmospheric pressure and in vacuum (6.67 kPa). Based on the complete phase diagram, it has been established that the distillation refining of aluminum from the tellurium impurity does not imply technological difficulties, with the exception of the rarefaction value equal to 6.67 kPa.