Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province

Kunming, China

Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province

Kunming, China
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Kong L.,Kunming University of Science and Technology | Kong L.,State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Clear Utilization | Kong L.,Key Laboratory of Vacuum Metallurgy for Non ferrous Metal of Yunnan Province | Yang B.,Kunming University of Science and Technology | And 14 more authors.
Fluid Phase Equilibria | Year: 2014

Based on the molecular interaction volume model (MIVM), the pair-potential energy parameters Bji and Bij of the related binary Sn-Pb, Pb-Sb and Sn-Sb alloy systems were calculated using the infinite dilution activity coefficients γi ∞ and γj ∞. The activities of components of the Sn-Pb-Sb ternary alloy system were predicted using Bji and Bij. Finally, the vapor-liquid phase equilibrium of the Sn-Pb-Sb alloy system was predicted using only the properties of pure components and the activity coefficients, which indicates that Sn can be separated from Pb and Sb by vacuum distillation thoroughly. A significant advantage of the model lies in its ability to predict the thermodynamic properties of multi-component liquid alloys using only two parameters. Moreover, the MIVM is reliable due to it has certain physical meaning from the viewpoint of statistical thermodynamics. © 2013 Elsevier B.V.


Kong L.,Kunming University of Science and Technology | Kong L.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | Kong L.,State Key Laboratory of Nonferrous Metal Resources Clean Utilization in Yunnan Province | Xu J.,Kunming University of Science and Technology | And 20 more authors.
Fluid Phase Equilibria | Year: 2016

Vacuum distillation experiments were conducted for tin-antimony alloy (Sn-Sb alloy) under the system pressure of 5 Pa. The content of Sb (mole fraction) in crude Sn, viz., xSb was reduced from 0.5000 to 0.0619 in a single stage distillation process under the condition of residual pressure of 5-10 Pa, distillation temperature of 1373 K and distillation time of 60 min. The activity coefficients of components of Sn-Sb alloy were calculated by using the molecular interaction volume model (MIVM), and the calculated average relative deviation and the average standard deviation were ±0.00039 and ± 0.173%, respectively for both Sn and Sb. The vapor-liquid equilibrium (VLE) phase diagrams, including the temperature-composition (T-x) and pressure-composition (p-x) diagrams of Sn-Sb alloy in vacuum distillation were calculated based on VLE theory and the MIVM. A reasonable agreement between the calculated results and the experimental data indicates that VLE phase diagrams obtained by this method are reliable. The VLE phase diagrams of alloys will provide an effective and convenient way for the designing of the process parameters of industrial production of vacuum metallurgy, and for the prediction of the needed product component dependence of temperature and pressure during the process of vacuum distillation. © 2016 Elsevier B.V.


Yu Q.-C.,Key Laboratory of Vacuum Metallurgy for Non ferrous Metal of Yunnan Province | Yu Q.-C.,Kunming University of Science and Technology | Deng Y.,Key Laboratory of Vacuum Metallurgy for Non ferrous Metal of Yunnan Province | Deng Y.,Kunming University of Science and Technology | And 9 more authors.
Journal of Central South University | Year: 2015

Desulfurization experiments of CuO, γ-Al2O3 and CuO/γ-Al2O3 were made in simulated flue gas by means of thermogravimetric analysis. It is found that reaction activities of CuO supported on γ-Al2O3 could be highly improved. Desulfurization kinetics of CuO/γ-Al2O3 was studied in the temperature range of 250 °C-400 °C and SO2 concentration of 0.1%-0.9%. The experimental data were tested and compared with kinetics models of volume reaction model (VRM), grain size model (GSM), random pore model (RPM) and pore-blocking model (PBM). Correlation analysis shows that VRM and RPM models do not fit experimental data well. GSM contradicts with the changes in the physical and chemical properties of CuO/γ-Al2O3 as the desulfurization proceeds. It is found that PBM is consistent with the change of pore structure of CuO/γ-Al2O3 sorbent during desulfurization process and predicts the conversion-time curves of the sorbent well. Meanwhile, kinetics parameters are obtained and discussed. © 2015, Central South University Press and Springer-Verlag Berlin Heidelberg.


Wang W.,National Engineering Laboratory for Vacuum Metallurgy | Wang W.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | Xiong H.,National Engineering Laboratory for Vacuum Metallurgy | Xiong H.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | And 17 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2015

We addressed the decomposition behavior of jamesonite (FePb4Sb6S14) in vacuum. The influence of the decomposition conditions, including but not limited to the decomposition temperature and time, the contents of jamesonite concentrate, and pressure, on the volatilization of PbS, Sb2S3 and ZnS was theoretically analyzed and experimentally evaluated with X-ray diffraction, differential scanning calorimetry-thermogravimetry, and conventional chemical analysis. The major compounds of the jamesonite concentrate include jamesonite, pyrite and stibnite. The preliminary results show that at 500℃, jamesonite can be completely decomposed into the stable compounds of Sb2S3, PbS and ZnS at a pressure in 1~10 Pa range. Complete volatilization of the Sb2S3, PbS and ZnS was observed at 500, 600 and 900℃, respectively. We suggest that the results be of some technological interest in vacuum metallurgy. ©, 2015, Science Press. All right reserved.


Xiong H.,National Engineering Laboratory for Vacuum Metallurgy | Xiong H.,Key Laboratory of Vacuum Metallurgy for Non ferrous Metal of Yunnan Province | Xiong H.,State Key Laboratory of Complex Non ferrous Metal Resources Clear Utilization in Yunnan Province | Yang B.,National Engineering Laboratory for Vacuum Metallurgy | And 14 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2014

A novel environmental firendly techniquie was developed to separate lead and antimoney from Jamesonite by vacuum evaporation. The impacts of the distillation conditions, such as the distillation temperature and time, pressure, and energy consumption, on the separation rates of lead and antimony were experimentally investigated. The contents of the condensed volatiles and slag were characterized with X-ray diffraction, and conventional chemical analysis. The preliminary results show that the newly-developed vacuum distillation is feasible to separate lead and antimony from jamesonite, and that the distillation temperature and time have a major impact on the separation. For example, at a distillation temperature ranging from 1200℃ to 1400℃, theseparation rates of lead and antimony were found to be higher than 99%. Besides, an increase of distillation time also weakly increased the separation rates. The multistage condenser is capable of enriching lead and antimony, respectively. The advantages of the novel technique over the conventional one on industrial scale were also tentatively discussed.


Zhou H.,National Engineering Laboratory for Vacuum Metallurgy | Zhou H.,State Key Laboratory Breed Base Of Complex Non Ferrous Metal Rsrc Clear Utilization In Yunnan Province | Chen X.,National Engineering Laboratory for Vacuum Metallurgy | Chen X.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | And 7 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

The 3-dimensional distributions of the transient temperature field, in the lab-built furnace dedicated to the vacuum alumina carbothermic reduction, were modeled based on finite element method, simulated with the software package ANSYS, and experimentally estimated. In the simulation, the continuous temperature rising in the heating and dissipation of heat was considered. The transient temperature distributions and the time evolution of the temperature field were also simulated. As compared to the test data, measured at the various key positions in the furnace with the platinum-rhodium thermocouples, the simulated results show a difference of less than 2%, and an average disagreement within 1%.


Li L.,National Engineering Laboratory for Vacuum Metallurgy | Li L.,State Key Laboratory Breeding Base Of Complex Non Ferrous Metal Res Clear Utilization In Yunnan Province | Liu D.,National Engineering Laboratory for Vacuum Metallurgy | Liu D.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | And 9 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

The feasibility of extracting and enriching Ag and Sb by vacuum distillation of the Pb-Sb multi-component alloys were theoretically analyzed, based on thermodynamics. The impacts of distillation conditions, including the distillation temperature, temperature holding time, and pressure, on the volatilization behavior of the various components were evaluated. The results show that at a pressure of 5~25 Pa, The increase of the distillation temperature and time intensify the volatilization of Ag and Sb. At 1223 K for 30~120 min, The enrichment rate of Ag and volatization rate of Sb were found to be higher than 99.28%, and 89.7%~92.8%, respectively. The X-ray diffraction results of the residue materials show that the formation of the Ag 3Sb, Cu 2Sb and Cu 10Sb phases prevented complete Sb volatilization. Besides, as the temperature holding time increased, the pressure decreased, more rapidly at a higher distillation temperature.


Li L.,National Engineering Laboratory for Vacuum Metallurgy | Li L.,State Key Laboratory Breeding Base Of Complex Non Ferrous Metal Res Clear Utilization In Yunnan Province | Liu D.,National Engineering Laboratory for Vacuum Metallurgy | Liu D.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | And 9 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

The evaporation behavior of Sb in distillation of the Ag-contained Pb-Sb multi-component alloys at a pressure about 5~25 Pa, was studied to extract Sb. The impacts of the distillation conditions, including the distillation temperature and time, contents of other metal species, on the evaporation rate of Sb were evaluated: and the dependence of Sb evaporation rate on temperature was estimated. The Sb condensate and residual materials were characterized with X-ray diffraction. The results show that Sb dominates in the Sb condensate. The coexistence of Cu, Ag and Sb in the form of Cu 2Sb and Cu 10Sb 3, and Ag 3Sb in the residue was possibly responsible for incomplete evaporation of Sb. The evaporation rate of Sb was calculated to be 15.169~18.066 g·cm -2·h -1.

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