State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province

Kunming, China

State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province

Kunming, China
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Ye Q.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Ye Q.,Kunming University of Science and Technology | Zhu H.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Zhu H.,Kunming University of Science and Technology | And 8 more authors.
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2013

Preparation of the reduced iron powder has been attempted with mill scale as the iron-bearing material and with wood charcoal as the reducing agent through microwave heating. The response surface methodology (RSM) is used to optimize the process conditions, with wood charcoal, process temperature, and holding time being the three process parameters. The regressed model equation eliminating the insignificant parameters through an analysis of variance (ANOVA) was used to optimize the process conditions. The optimum process parameters for the preparation of reduced iron powders have been identified to be the wood charcoal of 13.8 pct, a process temperature of 1391 K (1118°C), and a holding time of 43 minutes. The optimum conditions resulted in reduced iron powders with a total iron content of 98.60 pct and a metallization ratio of 98.71 pct. X-ray fluorescence (XRF) was used to estimate the elemental contents of the reduced iron powder, which meets the specification of the HY100.23 first-class iron powder standard. Additionally X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and scanning electron microscopy (SEM) analysis were performed and the results are compiled. © 2013 The Minerals, Metals & Materials Society and ASM International.


Lu M.-N.,Kunming University of Science and Technology | Lu M.-N.,Key Laboratory of Unconventional Metallurgy | Lu M.-N.,Engineering Laboratory of Microwave Application and Equipment Technology | Lu M.-N.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 13 more authors.
Hydrometallurgy | Year: 2013

This preliminary study examined the role of microwave radiation on precipitation and aging of iron oxyhydroxides at 60 C. It was observed that due to rapid heating under microwave, transformation of two line ferrihydrite to α-Fe2O3 takes place within 4-10 h. This is in contrast to the usual aging temperature of > 100 C adopted in most conventional studies, and several days of aging. Besides rapid transformation, microwave helps forming nanoparticles, with crystallite size of ~ 60 nm as determined from X-ray diffractograms, and < 100 nm particles as observed under TEM. Rapid transformation also promotes formation of α-Fe 2O3 without the formation of intermediate γ-Fe 2O3. This study brought out the advantages of low temperature microwave assisted precipitation/aging as a low energy process to transform iron oxyhydroxides, with likely applications in slurry rheology, synthesis of nanoparticles, and adsorption. © 2013 Elsevier B.V.


Tian J.-J.,Kunming University of Science and Technology | Tian J.-J.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Na W.,Kunming University of Science and Technology | Na W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 4 more authors.
Journal of Central South University | Year: 2014

Mesoporous CeO2 was first synthesized by hydrothermal method, and then used to synthesize different contents of CuO) x /CeO 2 (x: molar ratio of Cu to Ce) by deposition-precipitation method. These materials were characterized by X-ray diffraction (XRD), N2 adsorption and desorption, H2 temperature programmed reduction (H2-TPR) and O2 temperature programmed desorption (O 2-TPD) to study the crystal structure, surface area, and the mechanism of CO oxidation. The results show that, on XRD patterns, no evidence of CuO diffraction peaks is present until Cu loading is increased to 20%. The BET surface area decreases noticeably with the increase of Cu content. Compared with other samples, the better reducibility and activity oxygen species of (CuO)10%/CeO2 coincide with its better catalytic activity. © 2014 Central South University Press and Springer-Verlag Berlin Heidelberg.


Zhang X.-Y.,Kunming University of Science and Technology | Zhang X.-Y.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Hua Y.-X.,Kunming University of Science and Technology | Hua Y.-X.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 5 more authors.
Electrochimica Acta | Year: 2012

The electrochemical behavior of titanium dioxide film in Lewis basic AlCl 3-1-butyl-3-methylimidizolium ionic liquid (AlCl 3-BMIC) at room temperature was investigated by means of potentiodynamic polarization; cyclic voltammetry; sampled current voltammetry and electrochemical impedance spectroscopy (EIS). It was found that as the TiO 2 film thickness increased, a cathode inhibition effect of the oxide film on the reduction process was strengthened, which means that a greater overpotential was required to initiate the reduction process. In the EIS test, the preferable equivalent circuit was made to fit the experimental data and fitted parameters were obtained. Additionally, increasing reaction temperature can make the cathode depolarization. In the end, the model for this reduction process has been given on the basis of the pictures of reduced TiO 2 film and the electronic energy band structure models. © 2011 Elsevier Ltd. All rights reserved.


Zhan P.,Kunming University of Science and Technology | Zhan P.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Xu R.-D.,Kunming University of Science and Technology | Xu R.-D.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 5 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

In order to search for a suitable anode material used in zinc electrowinning in place of Pb-Ag alloy, Al/Pb-PANI (polyaniline)-WC (tungsten carbide) composite inert anodes were prepared on aluminum alloy substrate by double pulse electrodeposition (DPE) of PANI and WC particles with Pb 2+ from an original plating bath. Thereafter, anodic polarization curves, cyclic voltammetry curves and Tafel polarization curves for the composite inert anodes obtained under different PANI concentrations in the original plating bath were measured, and the microstructural features were also investigated by scanning electron microscopy (SEM). The results show that Al/Pb-PANI-WC composite inert anode obtained under PANI concentration of 20 g/L in the original plating bath possesses uniform microstructures and composition distributions, higher electrocatalytic activity, better reversibility of electrode reaction and corrosion resistance in a synthetic zinc electrowinning electrolyte of 50 g/L Zn 2+, 150 g/L H 2SO 4 at 35°C. Compared with Pb-1Ag alloy, the overpotential of oxygen evolutions for the composite inert anode are decreased by 185 mV and 166 mV, respectively, under 500 A/m 2 and 1000 A/m 2. © 2012 The Nonferrous Metals Society of China.


Zhang Q.,Kunming University of Science and Technology | Zhang Q.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Hua Y.,Kunming University of Science and Technology | Hua Y.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Wang R.,Kunming University of Science and Technology
Science China Chemistry | Year: 2013

The effect of two alklpyridinium hydrosulfate based ionic liquids (ILs) including N-butylpyridinium hydrogen sulfate (Bpy-HSO4) and N-hexylpyridinium hydrogen sulfate (HpyHSO4) as additives on the nucleation and growth of copper from acidic sulfate bath was investigated using cyclic voltammetry, chronoamperometric and scanning electron microscopy techniques. Results from cyclic voltammetry indicated that the two studied additives had a blocking effect on copper electrodeposition process and this effect initiated by HpyHSO4 was more pronounced in comparison to BpyHSO4. Dimensionless chronoamperometric current-time transients for the electrodeposition of copper from the bath free of additives were in good accord with the theoretical transients for the limiting case of instantaneous three-dimensional nucleation with diffusion-controlled growth of the nuclei. However, the instantaneous nucleation mechanism observed in the additive-free bath was changed to a more progressive one when additives were present in the bath. Surface morphology analysis indicated that alklpyridinium hydrosulfate ILs can induce the formation of leveled and finer grained deposits by the adsorption of additive at the first stages of deposition process, leading to decrease of the nucleation and growth rate of nuclei. © 2013 Science China Press and Springer-Verlag Berlin Heidelberg.


Wen X.-L.,Kunming University of Science and Technology | Wen X.-L.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Wang H.-T.,Kunming University of Science and Technology | Wang H.-T.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 2 more authors.
Procedia Engineering | Year: 2012

The flow boiling heat transfer inside horizontal smooth tubes is studied for refrigerant mixture R407C and a prediction model is proposed based on RBF neural network. The factors strongly affecting the flow boiling have been assumed as the inputs, such as mass flux (G), heat flux (q), quality (x), saturation temperature (T sat) and tube inner diameter (D). At the same time, the flow boiling heat transfer coefficient (h) as the output. The K-means clustering algorithm is applied to design RBF network. In addition, the prediction results is significantly improved compared with the four frequently used conventional correlations. For the network model of heat transfer, the average deviation, absolute average and root-mean-square deviations are -0.9%, 5.5% and 10.9%, respectively. Hence, the simulation results prove that the model based on RBF neural network is feasible to forecast the flow boiling heat transfer coefficient of R407C, and optimization design evaporators used R407C. © 2011 Published by Elsevier Ltd.


Chen R.,Kunming University of Science and Technology | Chen R.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Wang H.-T.,Kunming University of Science and Technology | Wang H.-T.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 2 more authors.
Procedia Engineering | Year: 2012

Aiming at the dimethyl ether itself with oxygen, this paper simulate that how much less oxygen quantity Dimethyl ether combustion required than liquefied petroleum gas in the same fuel quantity, and obtain optimum normoxia of dimethyl ether desired. This paper simulated dimethyl ether, liquefied petroleum gas (LPG) combustion with the air for 10%, 20%, 30%, 40%, 50%, 90% Oxygen levels. Under the different oxygen levels ,the study found that the best oxygen levels dimethyl ether combustion needed is around 30%, and the best oxygen levels liquefied petroleum gas (LPG) combustion needed is around 50%, so that Oxygen levels dimethyl ether needed is less than liquefied petroleum gas (LPG) needed in the same amount of fuel. © 2011 Published by Elsevier Ltd.


Xu R.D.,Kunming University of Science and Technology | Xu R.D.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Huang L.P.,CAS Shanghai Institute of Ceramics | Zhou J.F.,Kunming University of Science and Technology | And 7 more authors.
Hydrometallurgy | Year: 2012

In order to search for a suitable anode material in place of Pb-Ag alloy in zinc electrowinning, Al/Pb-PANI(polyaniline)-WC(tungsten carbide) composite inert anodes on aluminum substrates were prepared by double pulse electrodeposition (DPE) of WC and PANI particles with Pb 2+ from an original plating bath, in which solid particles were suspended by mechanical stirring. Thereafter, the anodic polarization curves, cyclic voltammetry curves and tafel polarization curves for the composite inert anodes obtained under different WC concentrations in the original plating bath, were measured in a synthetic zinc electrowinning electrolyte of 50 g·L - 1 Zn 2+, 150 g·L - 1 H 2SO 4 and 35 °C, and the microstructural features were also observed by scanning electron microscope (SEM). The results show that the co-deposition of WC and PANI particles with Pb 2+ in the original plating bath, changes the electrocrystallization morphologies for matrix metal Pb on aluminum substrates. Al/Pb-PANI-WC composite inert anode obtained under WC concentration of 30 g·L - 1 and PANI concentration of 20 g·L - 1 in the original plating bath, possesses uniform surface and cross sectional microstructures, higher electrocatalytic activity, lower overpotential of oxygen evolution, better reversibility of electrode reaction, better corrosion resistance and longer service times in a synthetic zinc electrowinning electrolyte of 50 g·L - 1 Zn 2+, 150 g·L - 1 H 2SO 4 and 35 °C. © 2012 Elsevier B.V. All rights reserved.


Wang S.,Kunming University of Science and Technology | Wang S.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Chen A.,Kunming University of Science and Technology | Chen A.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 4 more authors.
Environmental Progress and Sustainable Energy | Year: 2014

Leaching of palladium and rhodium from spent automobile catalysts by microwave roasting was investigated. The results indicated that leaching efficiency was obviously improved, the roasting temperature was remarkably reduced and the leaching time was shortened by microwave roasting. Microwave destroys the coatings on platinum group metals and increases the effective contact area of the solid-liquid reaction. The leaching rate was accelerated at low microwave roasting temperatures. The leaching ratio of Pd and Rh was about 99.74 and 94.79%, respectively. © 2013 American Institute of Chemical Engineers.

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