Obrabotka Metallov 2018 Vol. 20 No. 1

OBRABOTKAMETALLOV Vol. 20 No. 1 2018 19 TECHNOLOGY Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2018 vol. 20 no. 1 pp. 6–21 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2018-20.1-6-21 Processing of Antimony-tin Concentrates by Vacuum Distillation Alexey Korolev 1, a , Gennady Maltsev 1, b, * , Konstantin Timofeev 1, c , Vladimir Lobanov 2, d 1 JSC "Uralelektromed", 1 Prospect Uspensky, Verkhnyaya Pyshma, 624091, Russian Federation 2 Ural Federal University, 19 Mira st., Ekaterinburg, 620002, Russian Federation a http://orcid.org/0000-0002-0338-9774 , gennadymaltsev@mail.ru , b http://orcid.org/0000-0002-0750-0070 , mgi@elem.ru , c http://orcid.org/0000-0002-9525-6476 , K.Timofeev@elem.ru , d http://orcid.org/0000-0001-6450-8434 , lobanov-vl@yandex.ru ARTICLE INFO Article history : Received: 22 December 2017 Revised: 20 January 2018 Accepted: 08 February 2018 Available online: 15 March 2018 Keywords : Diagram Model Vacuum Alloy Distillation Tin Antimony Separation Concentrate ABSTRACT Object of research: the paper is devoted to the creation of environmentally friendly, technologically efficient and cost-effective high-performance integrated circuits for the processing of concentrate antimony-tin ( CАТ ) generated in the control filtering in the chemical and metallurgical shop, with commercial production of single-element products of antimony and tin. To analyze the behavior of multicomponent alloy in the processing, study of values of pressure and temperature, prediction of product composition and degree of separation of the metals during the high temperature sublimation the equilibrium phase diagrams VLE (vapor liquid equilibrium), in particular, the temperature–composition " T–x " are calculated. Objective: to study the influence of temperature and pressure in the system on the completeness of extraction and the degree of separation of antimony and tin from the CАТ . Methods and approaches: in constructing the equilibrium phase diagrams VLE calculation of the activity coefficients of the components of the Sb-Sn alloy was performed using three-dimensional model of molecular interaction volume model ( MIVM ). Novelty: provide new information on the influence of temperature and vacuum depth on the degree of sublimation and separation of metals from Sb- Sn compositions of different composition. Main results: in the temperature range 823...1073 К the saturated vapor pressure (Pа) Sn (0.00332...81.193) ∙ 10 –6 and Sb (3.954...273.664) are calculated. High values of * * Sb Sn / p p = (118.976...0.337) ∙ 10 7 and the separation factor logβSb = 6.262...9.435 assume the theoretical possibility to separate these components by vacuum distillation, while the antimony is concentrated in the composition of the sublimates (βSb > 1), and tin – the distillation residue. The tin content in the gas phase, the mole fraction (m. f.): у Sn = (0.002...9498.3) ∙ 10 –4 , increases in the temperature interval of 921–1878 K, pressure of 1.33...133 Pа and the amount of metal (m. f.) in the alloy х Sn = 0.9...0.9999. According to the values of the MIVM γ Sb = 0.439...0.992 and γ Sn = 0.433...0.992 for Sb–Sn alloy composition of 0.1...0.9 in the studied temperature range. Practical relevance: the equilibrium diagrams VLE are used in the preliminary stages of designing optimal technological regimes of industrial installations for vacuum distillation and for a reasonable choice of temperature and pressure of sublimation with the goal of obtaining Sn- and Sb-containing products of a given composition. The concept of CAT refining vacuum distillation is proposed. For citation: Korolev A.A., Maltsev G.I., Timofeev K.L., Lobanov V.G. Processing of antimony-tin concentrates by vacuum distillation. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2018, vol. 20, no. 1, pp. 6–21. doi: 10.17212/1994-6309-2018-20.1-6-21. (In Russian). ______ * Corresponding author Maltsev Gennady I ., D.Sc. (Engineering), Associate Professor JSC "Uralelektromed", 1 Prospect Uspensky, 624091, Verkhnyaya Pyshma, Russian Federation Tel.: 8 (922) 144-60-65, e-mail: mgi@elem.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov