Mechanical Pretreatment of Lead Based Alloy Anode for Zinc Electrowinning

The Pb–Ag–Ca alloy anode with surface passivation was applied in industrial production of zinc electrowinning. The application situation was investigated by detection and tracking more than 3 months. The results were analyzed by comparison with the data acquired from the production using the reference anodes without surface treatment. The results showed that using the anode with surface passivation can increase zinc yield, reduce Pb content in zinc product, prolong the anode life by improving the corrosion resistance, and then reduce the production costs.

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Cyclic Voltammetric Studies of the Behavior of Pb-0.3%Ag-0.06%Ca Rolled Alloy Anode during and after Zinc Electrowinning

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.2232 ◽

2013 ◽

Vol 750-752 ◽

pp. 2232-2235 ◽

Cited By ~ 1

Author(s):

Hai Tao Yang ◽

Huan Rong Liu ◽

Yong Chun Zhang ◽

Bu Ming Chen ◽

Zhong Cheng Guo ◽

...

Keyword(s):

Electrochemical Behaviour ◽

Anodic Oxide ◽

Anodic Peak ◽

Zinc Electrowinning ◽

Positive Direction ◽

Major Phase ◽

Oxide Layers ◽

Negative Direction ◽

Alloy Anode ◽

Sulphate Electrolyte

In this paper, electrochemical behaviour of Pb0.3%Ag0.06%Ca rolled alloy anode during the 6 days galvanostatic electrolysis in acid zinc sulphate electrolyte solution was investigated with Cyclic Voltammetry (CV) techniques. The phase composition of the anodic oxide layers during the electrolysis was observed using X-Ray Diffraction (XRD). The results revealed that with the increasing electrolysis time, the anodic peak (PbPbSO4) is mainly present a rise trend in the first day electrolysis, thereafter, almostly keep a constant value. And the anodic peak (PbPbSO4) gradually moved in the positive direction while the anodic peak (PbSO4β-PbO2, PbOα-PbO2) strongly moved in the negative direction. The cathodic peak (β-PbO2 and α-PbO2PbSO4) and (PbO and PbSO4Pb) mainly present a rise trend and gradually moved in the negative direction. Besides, the corrosion phase of the anodic oxide layers mainly consist of PbSO4, Pb, α-PbO2 and PbS2O3. After electrolysis for 3 days, the major phase of the anodic oxide layers is PbSO4 with a few Pb phase. When the electrolysis reaches the 6th day, the major phase of the anodic oxide layers is also PbSO4 with a few α-PbO2 phase. The preferred growth orientation of PbSO4 is (021) ,(121) and (212) planes.

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Lead Based Multi-Alloy Applied to Anode of Zinc Electrowinning

Materials Science Forum ◽

10.4028/www.scientific.net/msf.658.69 ◽

2010 ◽

Vol 658 ◽

pp. 69-72 ◽

Cited By ~ 5

Author(s):

Jun Zhu ◽

Xin Li ◽

Man Bo Liu ◽

Ying Zhai

Keyword(s):

Power Consumption ◽

Anode Material ◽

Anode Materials ◽

Production Costs ◽

Zinc Electrowinning ◽

Electrolytic Zinc ◽

Research Status ◽

Alloy Anode ◽

Selection Of

Alloy anode materials play an important role in zinc electrowinning process. Many kind of alloys can be used as anode materials, the selection of anode alloy directly influence the quality and cost of zinc electrowinning. Pb-Ag alloy anode material has been used generally in zinc electrowinning, however, it is proved the existence of many problems in practice. An important subject that new lead based multi-alloy applied to zinc electrowinning has been confirmed. Contrast testing study on the performance between Pb-Ag alloy anode plate and lead based multi-alloy anode plate was carried out on the basis of the research status, such as the output of precipitated zinc, the quality of electrolytic zinc, power consumption and anode life. It was found that when the technology of alloy-making had a breakthrough, the Pb-Ag alloy anode could be replaced by lead based multi-alloy anode under the condition that electrowinning technology was adapted, and the production costs could also be reduced.

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Electrochemical Behaviors of Pb–0.3%Ag-0.06%Ca Rolled Alloy Anode during and after Zinc Electrowinning - Tafel Investigations

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.401-403.779 ◽

2013 ◽

Vol 401-403 ◽

pp. 779-782

Author(s):

Hai Tao Yang ◽

Huan Rong Liu ◽

Zhong Cheng Guo ◽

Bu Ming Chen ◽

Yong Chun Zhang ◽

...

Keyword(s):

Oxygen Evolution ◽

Anodic Oxide ◽

Zinc Electrowinning ◽

Electrolysis Time ◽

Surface Exchange ◽

Electrochemical Behaviors ◽

Alloy Anode ◽

Galvanostatic Polarization ◽

Sulphate Electrolyte ◽

Kinetics Of

In this paper, the oxygen evolution potential and kinetics of Pb–0.3%Ag-0.06%Ca rolled alloy anode during the 15 days electrolysis in acid zinc sulphate electrolyte solution were investigated with galvanostatic polarization curve and Quasi-stationary polarization (Tafel) techniques. The results revealed that the anodic oxygen evolution potential and reaction kinetics varied a lot during the electrolysis for it is a process indicating the formation and stabilization of anodic oxide layer. With the increasing electrolysis time, the potentials (MSE) and overpotentials of oxygen evolution mainly present a declining trend while the electrode surface exchange current density a rising trend.

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