National Engineering Laboratory for Efficient Utilization of Refractory Non Ferrous Metals Resources

Changsha, China

National Engineering Laboratory for Efficient Utilization of Refractory Non Ferrous Metals Resources

Changsha, China

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Tian Q.,Central South University | Tian Q.,Postdoctoral Workstation of Daye Nonferrous Metals Co. | Tian Q.,National Engineering Laboratory for Efficient Utilization of Refractory Non Ferrous Metals Resources | Cheng L.,Central South University | And 3 more authors.
Advanced Materials Research | Year: 2012

Fine zinc powder with dendritic microstructure is applied in preparation of cathode of zinc-air battery. Based on a series of experiments, the electrodeposition was determined for the preparation of zinc powder with dendritic microstructure in the solution system of Zn 2+-NH 4 +-SO 4 2 - H 2O. The main factors affecting the process such as current density, temperature, concentration of reactants and schedule of brushing powder were investigated comprehensively. The optimal process conditions are15g/L Zn 2+, 30 ∼ 40g/L(NH 4) 2SO 4, 800 Am -2 current density at 30°C, with the schedule of brushing powder is 2 minutes. Based on the test results the optimal conditions, fine zinc powder with dendritic microstructure can be fabricated by electrodeposition. © (2012) Trans Tech Publications.


Lu X.-J.,Central South University | Hou J.-L.,Central South University | Lai Y.-Q.,Central South University | Lai Y.-Q.,National Engineering Laboratory for Efficient Utilization of Refractory Non Ferrous Metals Resources | And 5 more authors.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2013

Furan, epoxy, their composites were used to modify pitch binder for TiB2/C composite cathode in aluminum electrolysis. The physical-chemical properties of the cathodes have been investigated. When the pitch is modified by furan and epoxy composite, the cathode exhibits the lowest electrolysis expansion (0.60 pct), open porosity (28.80 pct), electrical resistivity (35.91 μΩ·m); the highest bulk density (2.54 g·cm-3); and compressive strength (44.90 MPa). Results of the semicokes from a scanning electron microscope show that cohesion and toughness are effectively improved, especially in the case of the furan and epoxy composite-modified pitch semicokes. Studies using Fourier transform infrared spectroscopy indicate that an aromaticity index of 0.845 and a condensed degree Abs880/Abs1600 of 0.927 of polynuclear aromatic hydrocarbons are obtained, suggesting that a more complete reaction of the cross-linked curing takes place in the pitch binder modified by furan and epoxy composite, which improves cohesion and toughness of the binder and, thus, enhances the performances of TiB2/C composite cathode. © 2013 The Minerals, Metals & Materials Society and ASM International.


Li Y.,Central South University | Jiang L.,Central South University | Liu F.,Central South University | Li J.,National Engineering Laboratory for Efficient Utilization of Refractory Non Ferrous Metals Resources | Liu Y.,Central South University
RSC Advances | Year: 2014

We report a facile electrochemical approach for the fabrication of phosphorus-doped (P-doped) PbO2-MnO2 composite electrodes with a microporous bicontinuous structure. Modification of such structures was achieved by controlling the MnO2 incorporation during an anodic co-deposition process. The results indicate the anodic co-oxidation of Pb 2+ and Mn2+ yielded a P-(PbO2-MnO2) deposit with a flat, compact and smooth surface. Meanwhile, the anodic composite deposition of Pb2+ and MnO2 particles resulted in the bicontinuous (P-PbO2)-MnO2 composite with a well-defined microporous morphology. Tafel and EIS were used to characterize their electrocatalytic performances for the oxygen evolution reaction in a typical anodic water-splitting process. The results indicate that such a novel bicontinuous (P-PbO2)-MnO2 composite anode exhibits significantly improved electrocatalytic activity as compared to the P-PbO 2 and P-(PbO2-MnO2) anodes. The oxygen evolution kinetics and possible reaction mechanism are further described. © The Royal Society of Chemistry 2014.


Tian Q.,Central South University | Tian Q.,National Engineering Laboratory for Efficient Utilization of Refractory Non Ferrous Metals Resources | Xin Y.,Central South University | Jiao C.,Central South University | And 2 more authors.
Advanced Materials Research | Year: 2012

A process utilizing ozone as the precipitant for the oxidation- precipitation of cobalt from cobalt chloride solution has been studied. The main factors affecting the oxidation rate such as the stirring speed, solution temperature, ozone partial pressure, initial concentration and flow rate were investigated comprehensively. The results demonstrated that the precipitate was CoOOH and the precipitation reaction is diffusion-controlled. The oxidation rate was independent of the initial concentration or solution temperature. The oxidation rate increases obviously with increasing the stirring speed. The Linear Relationship Between ozone partial pressure or flow rate and oxidation rate was found in this paper. © (2012) Trans Tech Publications.


Shang G.,Central South University | Shang G.,National Engineering Laboratory for Efficient Utilization of Refractory Non ferrous Metals Resources | Zhang G.,Central South University | Zhang G.,National Engineering Laboratory for Efficient Utilization of Refractory Non ferrous Metals Resources | Gao C.,Central South University
Desalination | Year: 2014

A new configuration of electrodeionisation with a bipolar membrane (EDI-BP) with a segment electrode was proposed for the treatment of simulated dilute Ni2+-containing wastewater. The feasibility of EDI-BP was analysed and experimentally validated, and its current density distribution was studied simultaneously. The results showed that the stack allows the removal of nickel and sulphate anions nearly completely from the 30mg/L Ni2+-containing wastewater. Under the experimental conditions, Ni2+-free diluate and a 27-times concentrated solution (820±50mg/L) can be obtained. The current density distribution of the stack is uneven, which is reflected by the following order of the resistances of the resins, Dowex 650C and Dowex 550A, with different ionic forms: Ni2+> Na+>H+ and SO4 2->Cl->OH-, respectively. © 2014 Elsevier B.V..


ZHONG X.C.,Central South University | Hong B.,Central South University | Li Y.H.,Central South University | Jiang L.X.,Central South University | And 2 more authors.
Advanced Materials Research | Year: 2012

A detailed investigation of the effects of Nd on the microstructure, mechanical properties and electrochemical properties of lead anode in 160g.L-1 at 35°C was carried out. Galvanostatic polarization and Chronopotentiometry (CP) were used to study the electrochemical behavior (such as anodic potential, corrosion rate and the composition of passive film) of the Pb and Pb-Nd anodes. The metallographic structure and passive film morphology of Pb and Pb-Nd anodes were observed and analyzed using polarizing microscope and scanning electronic microscopy (SEM), respectively. The experimental results show the grains become smaller and aggregation of PbxNdy become severe as the content of Nd increases. The addition of Nd enhances the formation of PbO2, inhibits the formation of PbSO4 and PbO and reduces the anodic potential. However, Holes presenting on rough passive film of high Nd content Pb-Nd anodes accelerate the corrosion. © (2012) Trans Tech Publications, Switzerland.

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