State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization

Kunming, China

State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization

Kunming, China
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Yang C.,Kunming University of Science and Technology | Yang C.,Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province | Yang C.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | Xu N.,Kunming Metallurgical Research Institute | And 12 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2016

The distillation and two-stage condensation in vacuum of the copper dross, the main by-product in Cu-smelting of Pb-matte, was mathematically modeled, theoretically calculated in thermodynamics and experimentally evaluated. The impact of the distillation and condensation conditions, including but not limited to the distillation temperature and time, pressure and contents of Cu-dross, on the removal of Pb and S, and recovery of Cu, Ag and Sb was investigated. The results show that depending significantly on the distillation and condensation conditions, the novel technique is capable of effectively recycling the Cu-dross in an environmental friendly way. To be specific, distillated at 1523 K and 20~160 Pa for 4.5 h, the primary condensate was found to be sulfides with 10% S; the secondary condensate was Pb-matte with 1.17% Cu; and the slag consists of Cu-Ag-Sb alloys with 0.46%S. © 2016, Science Press. All right reserved.


Wang J.,Kunming University of Science and Technology | Wang J.,Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province | Lu Y.,Kunming University of Science and Technology | Lu Y.,Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province | And 16 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2016

The possible equilibrium geometries of SnmAsn(m+n≤6) clusters, rich in tin-refining slag, were calculated and optimized in the density functional theory generalized gradient approximation, to single out the ground-state structure of the binary alloy cluster. The variables, including the average binding energy, Mulliken population and dipole moment, were evaluated. The calculated results show that it is favorable for the ground-state SnmAsn (m+n≤6) cluster to form a maximum number of Sn-As bonds, and that the stable structure with more Sn atoms better resembles that of Sn-cluster. Doping of an even number of As atoms into a Sn-As cluster increases its stability. All SnmAsn clusters are large polar molecules with Sn-donor and As-acceptor. The SnAs and Sn2As2 clusters werefound to have the strongest and the weakest dipole moments and polarities, respectively. © 2016, Science Press. All right reserved.


Wu C.,Kunming University of Science and Technology | Wu C.,Key Laboratory of Vacuum Metallurgy of Non ferrous Metals of Yunnan Province | Wu C.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | Li Z.,Kunming University of Science and Technology | And 15 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2016

The chlorination disproportionation of AlN in vacuum was mathematically modeled, theoretically analyzed in thermodynamic, dynamically simulated with software CASTEP code, and experimentally evaluated. The influence of the reaction conditions, including the temperatures of reaction and condensation, reaction time and pressure, on the recovery rate of Al was investigated with X-ray diffraction energy dispersive spectroscopy and scanning electron microscopy. The calculated results show that at 10~100 Pa, the AlN chlorination started above 1428 K, and only below 1064 K the metallic Al could be condensed. The dynamic simulation reveals that the AlN surfaces strongly chemisorb and easily react with AlCl3 molecules. The experimental results show that the higher temperature and longer temperature holding time resulted in more sufficient reaction, that is, greater rates of Al-recovery and weight loss of materials. Al-spheres, 20~300 μm in diameter with the purity higher than 99.28%, were extracted. © 2016, Science Press. All right reserved.


Liu F.,Kunming University of Science and Technology | Liu F.,Key Laboratory for Non ferrous Vacuum Metallurgy of Yunnan Province | Zhou Y.,Kunming University of Science and Technology | Zhou Y.,Key Laboratory for Non ferrous Vacuum Metallurgy of Yunnan Province | And 10 more authors.
Vacuum | Year: 2017

In this paper, thermal decomposition process of molybdenum concentrate in vacuum was thermodynamically analyzed, and decomposition mechanism of Mo[sbnd]S system in molybdenum was mainly studied. To further investigate and analyze the electronic properties in different temperature, the simulation calculations of MoS2(0 0 1) surface and Mo2S3(0 0 1) surface density of states, electron density difference, electronic orbital and Mulliken overlap population were carried out by density functional theory(DFT) formalism. The dynamics simulations results of MoS2(0 0 1) surface and Mo2S3(0 0 1) surface were obtained the temperature range of phase transforming are 1573 K–1673 K and from 1473 K to 1573 K at 20Pa, respectively. The interaction of MoS2 and Mo2S3 shows that thermal-decomposition of MoS2 and Mo2S3 does react, when new S[sbnd]S bonds and Mo[sbnd]Mo bond are formed instead of Mo[sbnd]S bond fracture. The experimental results of the thermal decomposition of MoS2 and Mo2S3 were in accordance with the thermodynamics theoretical calculation results and ab-initio molecular dynamics simulation results. © 2017 Elsevier Ltd


Kong X.-F.,Kunming University of Science and Technology | Kong X.-F.,Central South University | Kong X.-F.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | Yang B.,Kunming University of Science and Technology | And 9 more authors.
Journal of Central South University | Year: 2014

The industrial silica fume pretreated by nitric acid at 80 °C was re-used in this work. Then, the obtained silica nanoparticles were surface functionalized by silane coupling agents, such as (3-Mercaptopropyl) triethoxysilane (MPTES) and (3-Amincpropyl) trithoxysilane (APTES). Some further modifications were studied by chloroaceetyl choride and 1,8-Diaminoaphalene for amino modified silica. The surface functionalized silica nanoparticles were characterized by Fourier transform infrared (FI-IR) and X-ray photoelectron spectroscopy (XPS). The prepared adsorbent of surface functionalized silica nanoparticles with differential function groups were investigated in the selective adsorption about Pb2+, Cu2+, Hg2+, Cd2+ and Zn2+ ions in aqueous solutions. The results show that the (3-Mercaptopropyl) triethoxysilane functionalized silica nanoparticles (SiO2-MPTES) play an important role in the selective adsorption of Cu2+ and Hg2+, the (3-Amincpropyl) trithoxysilane (APTES) functionalized silica nanoparticles (SiO2-APTES) exhibited maximum removal efficiency towards Pb2+ and Hg2+, the 1,8-Diaminoaphalene functionalized silica nanoparticles was excellent for removal of Hg2+ at room temperature, respectively. © 2014, Central South University Press and Springer-Verlag Berlin Heidelberg.


Ren Y.,Kunming University of Science and Technology | Ren Y.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | Ma W.,Kunming University of Science and Technology | Ma W.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | And 7 more authors.
Vacuum | Year: 2014

A new route for degassing of molten aluminum alloys has been developed via the electromagnetic directional solidification. We evaluated the degassing feasibility and mechanism for the formation and evolution of the porosity. As expected, it enabled the migration of porosity to the upper end instead of the distribution in the whole sample. Furthermore, we investigated the effects of various pull-down rates, i.e., solidification rates on the degassing efficiency, porosity area fraction, and microstructure of alloys, etc. Clearly, the experimental results show that with the reducing of pull-down rates, the degassing efficiency increases and the porosity area fraction decreases, respectively. The lowest porosity area fraction is down to 0.08% under the 5 μm/s pull-down rate. Simultaneously, there are almost no porosity and other defects in the lower part of the final product. In conclusion, it offers an alternative method for degassing and possesses potential applications in aeronautic and space industry. © 2014 Elsevier Ltd. All rights reserved.


Song B.,Kunming University of Science and Technology | Song B.,Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province | Song B.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | Jiang W.,Kunming University of Science and Technology | And 8 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2015

Separation of the Pb-Sb alloy by vacuum distillation, an environmental pollutantproduced in Pb and Sb smelting slag and in their consumption, was mathematically modeled, theoretically analyzed in thermodynamics and experimentally evaluated. The separation coefficient of Sb, contents of Pb and Sb in volitile and residue were estimated by plotting the vapor-liquid equilibrium composition diagram of the Pb-Sb alloy in 923~1373 K range. The calculated results show that vacuum distillation is capable of separating Pb and Sb. The influence of the distillation conditions, including the temperature, distillation time, contents of Pb and Sb in the raw Pb-Sb alloy, on the volatilization rates of Pb and Sb were experimentally investigated. Distilled at 5~10 Pa and 973 K for 30 min, the Sb-content was found to be 57.44% in the volatile and crude Pb-content was estimated to be 88.82% in residue. © 2015, Science Press. All right reserved.


Xiao Y.,Yunnan University | Chen X.,Yunnan University | Ma W.,Kunming University of Science and Technology | Ma W.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | And 5 more authors.
International Journal of Materials Research | Year: 2015

Large-area and oriented silicon nanowire arrays have been successfully fabricated through a two-step metal-assisted chemical etching process at room temperature. The effects of key fabrication parameters (AgNO3 concentration, Fe(NO3)3 concentration, and etching time) on the silicon nanowire nanostructure were carefully investigated. The Raman spectra of silicon nanowires prepared under different etching times have been recorded and analyzed. The porosity and length of the nanowire increases with the increase in AgNO3 concentration from 0.002 mol L-1 to 0.1 mol L-1, which indicates that the re-dissolved Ag+ ions would work as the main oxidative species and catalyze the vertical and lateral etching of nanowires, leading to silicon nanowire growth and porous structure formation. © Carl Hanser Verlag GmbH & Co. KG.


Kong X.,Kunming University of Science and Technology | Kong X.,State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization | Yang B.,Kunming University of Science and Technology | Xiong H.,Kunming University of Science and Technology | And 9 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2014

A novel technique was developed to remove copper and tin from crude lead by vacuum distillation. The removal was theoretically and experimentally studied. The effects of the distillation conditions, particularly the distillation temperature and time, on the removal rate of copper and tin, direct recovery of lead, and recovery of silver were examined. The experimental results show that the removal rate of copper is close to 100%, the removal rate of tin is 98%, and the direct recovery of lead is also 98%, when distilled at a pressure from of 5 to 15 Pa and a temperature of 1323 K for 30 min. Moreover, the enriched silver was found to exist in the residue because silver is basically non-volatile. We suggest that vacuum distillation be a simple, clean, and effective technique to remove copper and tin from crude lead.

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