Laboratory of Vacuum Process, Centre of Earth Sciences, Metallurgy and Ore Beneficiation:

V. N. Volodin, Chief Scientist

R. A. Isakova, Chief Scientist

V. E. Khrapunov, Chief Scientist, e-mail: imarkin@mail.ru

Calculation methods of liquid-vapour phase transition boundaries in metal systems at atmospheric and low pressure are indicated. Examples of thalliumlead, copper-cadmium, cadmium-zink, lead-antimony phase diagrams are given to illustrate possibility of the system’s components separation processes forecasting predicting by their evaporation. Influence of the pressure decrease on the phase transition boundaries position is studied. It is shown that the liquid-vapour phase transitions in vacuum allowed to estimate value of energy consumption decrease due to lowering the solutions’ boiling point and possibility of one of the metals preferential evaporation. Based on the form of the solutions and vapour coexistence area it is possible to determine vapour phase equilibrium composition and, hence, condensate in the distillation process as well as minimal allowable rarefaction, below which a solid phase precipitation from the distillate takes place.

1. Konovalov D. P. Ob uprugosti para rastvorov (On the vapor pressure of solutions). Leningrad, 1928. 89 p.
2. Vrevskiy M. S. Raboty po teorii rastvorov (Work on the solutions theory) Ed. K. P. Mishchenko and B. P. Nikolskiy. Leningrad: AN SSSR, 1953. 241 p.
3. Chizhikov D. M., Sevryukov N. N. Nepreryvnoe rafinirovanie tsinka rektifikatsiey (Continuous refining of zinc distillation) Izv. AN SSSR. OTN. 1941. No. 9. pp. 89–97.
4. Tsvetkov Yu. V., Edelshteyn V. M. J. of Appl. Chem. (Russian). 1962. Vol. 35, No. 9. pp. 1927–1933.
5. Kotov E. I. Trudy Severo-Kavkazskogo Gorno-Metallurgicheskogo Instituta (Proc. North-Caucasian Mining and Metallurgical Institute). 1951. No. 9. pp. 107–131.
6. Predel B., Schwerman W. J. Inst. Metals. 1969. Vol. 97, No. 4. pp. 122–125.
7. Morachevskiy A. G., Smirnova N. A., Piotrovskaya E. M. and etc. Termodinamika ravnovesiya zhidkost-par (Thermodynamics of liquid-vapor equilibrium). Leningrad: Khimiya, 1989. 344 p.
8. Kogan V. B. Geterogennye ravnovesiya (Heterogeneous equilibrium). Leningrad: Khimiya, 1968. 432 p.
9. Volodin V. N. Kompleksnoe ispolzovanie mineralnogo syrya — Complex usage of mineral raw materials. 2007. No. 1. pp. 90–95.
10. Volodin V. N., Khrapunov V. E., Isakov R. A., Moldabayev M. Izvestija Vuzov. Tsvetnaya metallurgiya — News of Higher Schools. Non-ferrous Metallurgy Transaction. 2005. No. 6. pp. 17–22.
11. Bayanzhanova Sh. T., Volodin V. N., Khrapunov V. E. Kompleksnoe ispolzovanie mineralnogo syrya — Complex Usage of Mineral Raw Materials. 2006. No. 4. pp. 74–78.
12. Volodin V. N. Kompleksnoe ispolzovanie mineralnogo syrya — Complex Usage of Mineral Raw Materials. 2007. No. 3. pp. 75–81.
13. Volodin V. N. Kompleksnoe ispolzovanie mineralnogo syrya — Complex Usage of Mineral Raw Materials. 2002. No. 5. pp. 38–46.
14. Esyutin V. S., Taziev Zh. Sh., Nurgaliev D. N. Kompleksnoe ispolzovanie mineralnogo syrya — Complex Usage of Mineral Raw Materials. 1978. No. 3. pp. 12–16.
15. Esyutin V. S., Taziev Zh. Sh., Nurgaliev D. N. Tsvetnye metally — Non-ferrous Metals. 1978. No. 10. pp. 53–56.
16. Isakova R. A., Reznyakov A. A., Spivak M. M. Rafinirovanie selena (Selenium refining). Alma-Ata: Nauka, 1975. 106 p.
17. Reznyakov A. A., Isakova R. A., Esyutin V. S. Vaccumnye protsessy v tsvetnoy metallurgii (Vacuum processes in non-ferrous metallurgy). Alma-Ata: Nauka, 1967. pp. 22–26.
18. Isakova R. A., Nesterov V. N., Spivak M. M. and etc. Vaccumnye protsessy v tsvetnoy metallurgii (Vacuum processes in non-ferrous metallurgy). Alma-Ata: Nauka, 1967. pp. 13–18.