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Behavior of arsenic in zinc electrowinning

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Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 50-54页

作者：俞小花谢刚李荣兴李永刚陆莹 Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Technology Center of Yunnan Metallu rgy Group Co.

The effects of arsenic on the cathode polarization process in zinc electrowinning,its kinetics equation,parameters and polarization mechanism were studied by multiple electrochemistry *** experimental results show that,if[As 3+]≥3 mg/L,electrowinning first enters into stationary passivation range,and then enters into precipitation range,which indicates that the depolarization function of impurity arsenic is zinc electrowinning.

关键词： zinc electrowinning arsenic cathode polarization kinetics equation parameters

Polyaniline anode for zinc electrowinning from sulfate electrolytes

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Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 288-292页

作者：黄惠周继禹陈步明郭忠诚 Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology The No.705 research Institute

Polyaniline(Pani)anode is tested to highlight the feasibility of reduction of both energy consumption and capital costs in zinc electrowinning from sulfate solution without any modification to the existing *** density,electrolyte temperature, added gelatin,added Mn 2+ ,oxygen-evolution potential,cell potential and long duration tests were *** zinc deposits were also studied by means of scanning electron microscope(SEM)and X-ray diffraction(XRD).The results show that current density and added gelatin change the preferred crystal orientations of the zinc *** with Pb-Ag(1%)anode used in industry,the cell voltage decreases by 0.15-0.30 V,energy consumption of Zn is 2.46-2.70 kW·h/kg which results in 20%energy *** duration tests show that Pani anode can represent a good alterative ability for zinc *** deposits obtained have no Pb *** additions of Mn2 +ions and gelatin also change the surface morphology and deposit quality of the electrodeposited zinc,affecting the crystal *** researches demonstrate that Pani anode has distinct advantages over acidic electrowinning process.

关键词： polyaniline anode zinc electrowinning morphology crystal orientation

Fabrication and anodic polarization behavior of lead-based porous anodes in zinc electrowinning

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Journal of Central South University of Technology 2008年第6期15卷 757-762页

作者：衷水平赖延清蒋良兴吕晓军陈佩如李劼刘业翔 School of Metallurgical Science and Engineering Central South University

A new type of lead-based porous anode in zinc electrowinning was prepared by negative pressure infiltration. The anodic polarization potential and corrosion rate were studied and compared with those of traditional fiat anodes （Pb-0.8%Ag） used in industry. The anode corrosion rate was determined by anode actual current density and microstructure. The results show that the anodic oxygen evolution potential decreases first and then increases with the decrease of pore diameter. The anodic potential decreases to the lowest value of 1.729 V at the pore diameter of 1.25-1.60 mm. The porous anode can decrease its actual current density and thus decrease the anodic corrosion rate. When the pore diameter is 1.60-2.00 mm, the anodic relative corrosion rate reaches the lowest value of 52.1%.

关键词： zinc electrowinning negative pressure infiltration porous anode anode potential corrosion rate

Effect of doping Bi on oxygen evolution potential and corrosion behavior of Pb-based anode in zinc electrowinning

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Journal of Central South University 2009年第2期16卷 236-241页

作者：赖延清衷水平蒋良兴吕晓军陈佩如李劼刘业翔 School of Metallurgical Science and Engineering Central South University

A new anodic material of ternary Pb-0.8%Ag-(0-5.0%)Bi alloy for zinc electrowinning was obtained by doping *** anodic oxygen evolution potential,corrosion rate,surface products after polarization,and microstructures before and after polarization were studied and compared with those of Pb-0.8%Ag anode used in *** results show the anodic overpotential decreases with the increase of Bi content in the *** the content of Bi is 1.0%(mass fraction),the anodic overpotential is 40-50 mV lower than that of Pb-0.8%Ag *** the corrosion rate decreases and then increases with the increase of Bi *** Pb-0.8%Ag-0.1%Bi anode has the lowest corrosion rate(0.090 6 mg/(h·cm2).Doping Bi influences the structure of the anodic layer,but does not change the *** Pb-0.8%Ag-1.0%Bi anode layer is of a more fine-grained structure compared with Pb-0.8%Ag anode.

关键词： Pb-Ag anode doping Bi zinc electrowinning oxygen evolution potential corrosion rate

Anodic behavior and microstructure of Al/Pb-Ag-Co anode during zinc electrowinning

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Journal of Central South University 2014年第1期21卷 83-88页

作者：张永春陈步明杨海涛黄惠郭忠诚 Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology Kunming Hendera Science and Technology Co.Ltd

In order to study the anodic behavior and microstmctures of A1/Pb-Ag-Co anode during zinc electrowinning, by means of potentiodynamic investigations, scanning electron microscopy （SEM） and X-ray diffraction （XRD） analyses, the mechanism of the anodic processes playing on the surface of A1/Pb-0.8%Ag and A1/Pb-0.75%Ag-0.03%Co anodes prepared by electro-deposition from methyl sulfonic acid bath for zinc electrowinning from model sulphate electrolytes have been measured. On the basis of the cyclic voltammograms obtained, information about the corrosion rate of the composite in PbO2 region has been concluded. The microstructures were also observed by means of SEM and XRD which showed Pb-0.75%Ag-0.03%Co alloy composite coating has uniform and chaotic orientation tetragonal symmetry crystallites of PbSO4, but Pb-0.8%Ag alloy composite coating has well-organized orientation crystallites of PbSO4 concentrated in the certain zones after 24 h of anodic polarization. It is important that Al/Pb-0.75%Ag-0.03%Co anode oxide film consists of non-conductive dense MnO2 and PbSO4 and a, fl-PbO2 penetrated into which, in fact, are the active centers of the oxygen evolution after 24 h of anodic polarization.

关键词： A1/Pb-Ag-Co anode zinc electrowinning potentiodynamic investigation corrosion rate

Anodic behavior and microstructure of Al/Pb-Ag anode during zinc electrowinning

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Transactions of Nonferrous Metals Society of China 2014年第3期24卷 893-899页

作者：张永春陈步明杨海涛郭忠诚徐瑞东昆明理工大学冶金与能源工程学院昆明650093 昆明理工恒达科技有限公司昆明650106

Anodic behaviors and oxygen evolution kinetics of Pb-0.8%Ag and Al/Pb-0.8%Ag anodes during the initial 24 h zinc electrowinning were investigated with cyclic voltammetry （CV） curves and electrochemical impedance spectroscopy （EIS）. The results reveal that the anodic behaviors and reaction kinetics of the two anodes vary a lot during the anodic polarization which indicate the formation and stabilization of anodic layer. Compared with conventional Pb-0.8%Ag anode, A1/Pb-0.8%Ag anode has longer time of anodic polarization. At the very beginning of anodic polarization, the two anodes all exhibit higher potential of oxygen evolution reaction （OER） since the reaction is controlled by the transformation step of intermediates. Then, its OER potential is largely diminished and OER rate is deduced from the formation and adsorption of the first intermediate （S-OHms）. In the prolonged anodie polarization, the anodie potential of A1/Pb-0.8%Ag gradually decreases and the final value is more stable than that of conventional Pb-0.8%Ag anode. On the anodic layer after 24 h of anodic polarization, the OER potential is controlled by the formation and adsorption of intermediate. The microstructures of A1/Pb-0.8%Ag and Pb-0.8%Ag anodes after 24 h of anodie polarization were analyzed by scanning electron microscope （SEM）.

关键词： zinc electrowinning oxygen evolution kinetics electrochemical impedance spectroscopy oxygen evolution reactionpotential

Effect of cooling ways on properties of Al/Pb-0.2%Ag rolled alloy for zinc electrowinning

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Transactions of Nonferrous Metals Society of China 2017年第9期27卷 2096-2103页

作者： Xiang-yang ZHOU Shuai WANG Juan YANG Zhong-cheng GUO Jian YANG Chi-yuan MA Bu-ming CHEN School of Metallurgy and Environment Central South University Changsha 410083 China Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China Kunming Hendera Science and Technology Co. Ltd. Kunming 650106 China

In order to study the new anode materials for zinc electrowinning,Al/Pb?0.2%Ag rolled alloy was produced by composite casting and hot *** the effect of cooling ways on properties of Al/Pb?0.2%Ag rolled alloy was *** the results of metallographic test indicated,with the increasing of cooling intensity,both Vickers hardness and yield strength of Al/Pb?0.2%Ag rolled alloy ***,the Al/Pb?0.2%Ag rolled alloy,cooled by ice salt,presents the finest grain size and shows the lowest oxygen evolution potential(1.5902V),while that of alloy cooled by water and air are1.6143V and1.6288V,***,the corrosion current density and corrosion rate of the Al/Pb?0.2%Ag rolled alloy,cooled by ice salt,are the *** can be attributed to its largest specific surface area,which promotes the contact between the anode and electrolyte.

关键词： Al/Pb-0.2%Ag rolled alloy cooling way electrocatalytic activity electrochemical property corrosion resistance zinc electrowinning

Effects of anode slime removing by Fe^(2+)dissolution method on electrochemical properties of Pb−0.6%Ag anode and zinc electrowinning

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Transactions of Nonferrous Metals Society of China 2024年第11期34卷 3777-3788页

作者： Wen-jun WANG Lan-bo LI Xu LIU Tie-chui YUAN He-xin GAO State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Zhejiang Libo Industrial Co. Ltd.Shaoxing 312000China College of Mechanical and Energy Engineering Shaoyang UniversityShaoyang 422000China Zhuzhou Smelter Group Co. Ltd.Zhuzhou 412000China

Fe^(2+)dissolution method and manual method were used to remove the anode slime and their effects on properties of cast Pb−0.6wt.%Ag anode and zinc electrowinning were *** results reveal that the Fe^(2+)dissolution method can avoid mechanical damage to the oxide film layer on the anode surface,which cannot be achieved by traditional manual *** can lower the anode corrosion rate by 57.14%,thus reducing Pb contamination in electrolyte and zinc ***,compared with manual method,Fe^(2+)dissolution method can significantly improve the electrocatalytic activity of the anode and lower the initial power consumption of zinc electrowinning to 2720 kW·h/t after removing anode slime.

关键词： Pb−Ag anode zinc electrowinning anode slime removing electrochemical properties

Electrochemical properties of powder-pressed Pb-Ag-PbO_(2) anodes

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Transactions of Nonferrous Metals Society of China 2019年第11期29卷 2422-2429页

作者： Hai-hua LI Tie-chui YUAN Rui-di LI Wen-jun WANG Dan ZHENG Ji-wei YUAN State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Zhuzhou Smelter Group Company Limited Zhuzhou 412004China Guizhou R&D Center of Titanium Materials Co. Ltd.Zunyi 563004China

Pb?Ag?PbO2 composite anodes with different mass fractions(1%,2%,3%,4%and 5%)ofβ-PbO2 were prepared by powder-pressed(PP)*** galvanostatic polarization curves,Tafel curves and anodic polarization curves were tested in sulfuric acid *** morphologies and phase compositions of the anodic layers formed after galvanostatic polarization were investigated by using scanning electron microscope(SEM)and X-ray diffractometer(XRD),*** results showed thatβ-PbO2 can improve the electrocatalytic activity of anodic *** anode containing 3%β-PbO2 had the lowest overpotential of oxygen evolution reaction(OER)and the best corrosion *** morphologies of the anode surfaces were gradually transformed from regular crystals to amorphous ones as the content ofβ-PbO2 increased in anodes.

关键词： power-pressed Pb-Ag-PbO_(2) anode oxygen evolution overpotential electrochemical properties zinc electrowinning