Application of molecular interaction volume model in separation of Sn-Zn alloy by vacuum distillation

Abstract

The activity of components of Sn-Zn binary alloy system was predicted based on the molecular interaction volume model (MIVM). The calculated values are in good agreement with available experimental data of activities, which indicates that this model is of stability and reliability because the MIVM has a good physical basis. The vapor-liquid phase equilibrium of Sn-Zn alloy system in vacuum distillation was calculated as a function of the activity coefficient. The results show that the content of Sn in vapor phase is 4.2×10⁻⁷ (mass fraction) while in liquid phase it is 90% (mass fraction) at 1 073 K, and the content of Sn in vapor phase increases with increasing the melt temperature and content of Sn in liquid phase. Vacuum distillation experiments were carried out on Sn-Zn alloy for the proper interpretation of the results of the MIVM in the temperature range of 973–1 273 K under pressures of 15–200 Pa. The experimental results show that the content of Sn in vapor phase is 5×10⁻⁶ (mass fraction) while in liquid phase it is 90% (mass fraction) under the operational condition of 1 073 K, 100 min and 15 Pa. The experimental results are in good agreement with the predicted values of the MIVM for Zn-Sn binary alloy system.

Keywords

vacuum distillation / molecular interaction volume model (MIVM) / separation

References

[1] AriM, SaatçiB, GündüzM, PayverenM, DurmuşS. Preparation of high pure zinc for electronic applications using selective evaporation under vacuum [J]. Materials Characterization, 2008, 59: 757-763

[2] WasedaY, IssikiMPurification process and characterization of ultra high purity metals: Application of basic science to metallurgical processing [M], 2002New YorkSpringer97

[3] QiuK-q, WuQ, ZhanZ-hua. Vacuum pyrolysis characteristics of waste printed circuit boards epoxy resin and analysis of liquid products [J]. Journal of Central South University: Science and Technology, 2009, 40(5): 1209-1215

[4] AliS T, Srinivas RaoK, LaxmanC, MunirathnamN R, PrakashT L. Preparation of high pure zinc for electronic applications using selective evaporation under vacuum [J]. Separation and Purification Technology, 2012, 85: 178-182

[5] AliS T, PrasadD S, MunirathnamN R, PrakashT L. Purification of tellurium by single-run multiple vacuum distillation technique [J]. Sep Purif Technol, 2005, 43: 263-267

[6] ShelpakovaI R, KosynkovV I, KovalevskiS V, ShestakovV A. The use of evaporation in vacuum purification and analysis of zinc [J]. Mater Res Bull, 1998, 33(2): 173-181

[7] KovtunG P, ShcherbanA P, VirichV D. Obtaining high purity zinc combining the distillation and crystallization methods [J]. J Kharkiv National University, Physical Series, Nuclei Particles Fields, 2004, 619(1/2/3): 95-104

[8] GopalaA, KipphardtH, MatschatR, PanneU. Process methodology for the small scale production of m6N5 purity zinc using a resistance heated vacuum distillation system [J]. Mater Chem Phys, 2010, 122: 151-155

[9] YangH-w, XuB-q, YangB, MaW-h, TaoD-ping. Calculation of phase equilibrium in vacuum distillation by molecular interaction volume model [J]. Fluid Phase Equilibria, 2012, 3: 78-81

[10] ZhengS-s, ChenW-h, CaiJ, LiJ-t, ChenC, LuoX-tao. Mass transfer of phosphorus in silicon melts under vacuum induction refining [J]. Metallurgical and Materials Transactions B, 2010, 41B: 1268-1273

[11] DaiY-n, YangBinNon-ferrous metals and vacuum metallurgy [M], 2000BeijingMetallurgical Industry Press40

[12] TaoD-ping. Prediction of the thermodynamic properities of quaternary liquid alloys by modified coordination equition [J]. Thermochim Acta, 2002, 383: 45-51

[13] YangH-w, TaoD P, YangX-m, YuanQ-mei. Prediction of the formation enthalpies of Bi-Cd-Ga-In-Pb-Sn-Zn liquid alloys by binary infinitely dilute enthalpies [J]. Journal of Alloys and Compounds, 2009, 480: 625-628

[14] TaoD-ping. Prediction of activities of all components in the lead-free solder systems Bi-In-Sn and Bi-In-Sn-Zn [J]. Journal of Alloys and Compounds, 2008, 457: 124-130

[15] YangH-w, TaoD-ping. Prediction of the mixing enthalpies of the Al-Cu-Ni-Zr quaternary alloys by the molecular interaction volume model [J]. Metallurgical and Materials Transactions A, 2008, 39: 945-949

[16] TaoD-ping. A Comparison of the molecular interaction volume model with the subregular solution model in multicomponent liquid alloys [J]. Metallurgical and Materials Transactions A, 2004, 35: 419-424

[17] YangH-w, TaoD-ping. Prediction of the mixing enthalpies of binary liquid alloys by molecular interaction volume model [J]. Acta Metallurgica Sinaca, 2008, 21: 336-340

[18] YangH-w, TaoD-p, YuanQ-m, YangYu. Predicting the formation enthalpies of Cd-Ga-In-Sn-Zn liquid alloys by the limiting partial enthalpies [J]. Fluid Phase Equilibria, 2009, 275: 64-69

[19] IidaT, GuthrieR I LPhysical properties of liquid metals [M], 1988OxfordClarendon Press19

[20] FerroR, SacconeAStructure of solids [M] GEROLD V Ed, 1993WeinheimVCH Verlagasgesellschaft194

[21] TaoD-ping. Prediction of the coordination numbers of liquid metals [J]. Metallurgical and Materials Transactions A, 2005, 36: 3495-3497

[22] PredelBLANDOLT-BORNSTEIN. Group IV: Physical Chemistry [M]. Vol. 12, 2006Berlin, Heidelberg, New YorkSpringer20

[23] HultgrenR, DesaiP D, HawkinsD T, GeiserM, KelleyK KSelected values of the thermodynamic properties of binary alloys [M], 1973Metals Park, OHASM1268