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Preparation and Properties of zinc electrowinning using polyaniline / boron carbide anode material

Author: LiJuKang
Tutor: GuoZhongCheng
School: Kunming University of Science and Technology
Course: Non-ferrous metallurgy
Keywords: Polyaniline / boron carbide Composites Electrochemical properties Zinc Electrowinning
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 13
Quote: 0
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Abstract


, The zinc electrowinning use the anode material generally lead-based alloy anodes, such electrodes following deficiencies: (1) oxygen evolution overpotential (about 860mV), thereby increasing the electrolysis energy consumption nearly 1000kW/h- Zn; (2) relatively poor corrosion resistance, cathode products susceptible to lead contamination; (3) low mechanical strength, creep resistance, easy to bend, causing a short circuit. Shortcomings of lead-based alloy anodes, domestic and foreign researchers have developed different anode are unable to replace the lead-based alloy anodes due to the problems of life and production costs. Therefore, the research and development of new energy-efficient anode material is one of the hot spots of the field of hydrometallurgy PANI/B4C anode has a unique molecular structure, can effectively reduce the oxygen evolution potential to improve the the anode corrosion resistance and extend the life of the anode, reducing energy consumption and improve the quality of the cathode zinc. This article was prepared by in situ chemical method PANI/B4C composite investigate the polymerization mechanism of the composite conductivity draw composite preparation process;, research PANI/B4C anode in zinc sulfate electrolytic The electrochemical behavior of the fluid system, compared to the oxygen evolution potential of Pb-Ag (1% wt) zinc sulfate electrolytic process, the cell voltage, current efficiency, energy consumption, and the life of the electrode and cathode zinc quality. FTIR, XRD, SEM, EDS, and thermal analysis of modern analytical tools to characterize the composite. Electrochemical anodic polarization curves, Tafel curves, cyclic voltammetry, electrochemical impedance spectroscopy, oxygen evolution potential means the determination of the kinetic parameters of the electrode in the zinc sulfate electrolyte. The results show that: (1) PANI/B4C composites optimum preparation process: V acetone: V water = 0.2, CAN = 0.5mol / L, mB4c: MAN = 0.2, C acid mixture = 1 mol / L (wherein of H2SO4: SSA = 4:1), C oxidant (?) = 0.5 mol / L,. The conductivity of PANI/B4C composites 35.63S/cm, electrical conductivity and thermal stability higher than that of pure polyaniline. (2) PANI molecular chain and the presence of a chemical bond between the B4C interaction of B4C in C in the \so that the conductivity of the composite material increased. (3) In the zinc sulphate electrolyte system PANI/B4C corrosion resistance and electrochemical stability of the anode than PANI. Anodic polarization curve, AC impedance, and electro-catalytic activity of the the the PANI/B4C electrocatalytic activity order the good in PANI/B4C gt; the PAN gt; Pb-Ag (1% wt) alloy anode. (4) at the current density of 500A/m2 lower oxygen evolution potential of the Pb-Ag alloy anode (1 wt%) is 1.864V PANT oxygen evolution potential of the anode is 1.575V, PANI/B4C oxygen evolution potential of the anode is 1.52 V, PANI/B4C composite materials used in zinc electrowinning, can significantly reduce the cell voltage and reduce the energy consumption, Pb-Ag (1% wt) of the anode life of 2.37 years, PANI and anode was 1.32, PANI / B4C 1.6 years. (5) PANI/B4C anode causes of failure in one hand, an anode immersed in the electrolyte for a long time, the coating in the erosion by oxygen and the the B4C surface of polyaniline gradually fall off, so that the the B4C exposed, conductivity is decreased to cause the anode, and the other On one hand, the anode surface cracking, particle charge transfer resistance increases, so that the electrode conductive disconnection, so that the anode lost conductive.

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