Electrochemical characteristics of Co3O4-doped β-PbO2 composite anodes used in long-period zinc electrowinning

He, Shiwei; Xu, Ruidong; Sun, Li; Fan, Youqi; Zhao, Zhuo; Liu, Huan; Lv, Huihong

doi:10.1016/j.hydromet.2020.105357

Cited by 34 publications

(6 citation statements)

References 37 publications

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“…The anode slime is mainly composed of manganese dioxide, with lead contamination as a hazardous waste [6,7]. Lead-based anodes also impose a nearly 30% extra power requirement due to the high overpotential of the oxygen evolution reaction (OER), which is heavily dependent on the structure and composition of the anode material [8,9]. Such high energy costs, along with environmental pressure for carbon neutrality, have stimulated significant interest in searching for a suitable substitution for lead anodes [10].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Askarian,

Mousavi,

Dufault-Bedard

et al. 2024

Metals

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Removing manganese from zinc electrolytes is necessary to pave the way for replacing lead-based anodes with mixed metal oxide (MMO) anodes. MMO anodes offer significantly lower overpotential towards oxygen evolution reactions, thus are attractive from an energy consumption viewpoint. Previous studies had shown that, thanks to the catalytic effect of cobalt, manganese can be removed successfully from the zinc purification solution through the oxidative precipitation method using a simulated roasting off-gas plant. This study focuses on understanding the primary mechanism behind manganese oxidation precipitation and investigating the influence of various operating parameters such as temperature, dissolved oxygen (DO), and solution potential on the reaction kinetics. The results revealed that the kinetics of the reaction was highly dependent on the temperature and catalyst activity rather than on the reactant concentration. Additives, with radical scavenging effects, were added to identify the radicals responsible for the oxidation of Mn. The manganese oxidation reaction was dramatically suppressed when methanol was added. However, in the presence of tert-butyl alcohol (TBA), a sensible reduction in manganese removal was not observed, suggesting sulfate radical as the predominant species for oxidizing manganese. The physical and chemical characteristics of the sediments were also presented.

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Section: Introductionmentioning

confidence: 99%

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Askarian,

Mousavi,

Dufault-Bedard

et al. 2024

Metals

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“…Currently, over 85% zinc in the world is obtained by electrowinning via hydrometallurgy [1]. The electrowinning process of zinc consumes nearly 80% of the total energy of the hydrometallurgical process, and the decomposition voltage of zinc sulfate accounts for 70% of the electrolytic voltage in the electrodeposition process of zinc [2]. therefore, reducing the energy consumption in electrodeposition is the key to reduce the cost.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous Microstructure Improving the Mechanical and Electrochemical Properties of Lead Alloys by Stirring Treatment

Jiang,

Zhou,

et al. 2024

Preprint

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Homogeneous microstructure in lead alloy matrix plays an important role in improving its mechanical and electrochemical properties. In this work, different stirring speed provided during the melt casting of the alloy are tended to obtain lead alloys with different microstructure. The results show that proper stirring speed is beneficial for improving the overall homogeneity of the alloy, however, as the stirring speed is too high, plenty of second phase impurities and defects produced in the lead matrix, which possesses negative effect on the mechanical and electrochemical properties. The most uniform composition and homogeneous microstructure was obtained when the stirring speed is 100 r/min, which is conducive to the decrease of oxygen evolution potential of 30 mV and charge transfer resistance of 22.77%, and the increase of the corrosion resistance of 1.49%, and promote the generation of the uniform and dense PbO2 protective layer.

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“…3 Generally, Pb-(0.5-1%)Ag alloy is the most extensively employed insoluble anode. 4,5 However, its deciencies, such as high overpotential, poor conductivity, and Pb contamination, are still tremendous challenges. 6,7 Lead dioxide (PbO 2 ), as an inert metal oxide with the characteristics of good corrosion resistance and low price, is regularly prepared on the surface of Pb-(0.5-1%)Ag alloy in the zinc electrowinning industry.…”

Section: Introductionmentioning

confidence: 99%

“…3 Generally, Pb–(0.5–1%)Ag alloy is the most extensively employed insoluble anode. 4,5 However, its deficiencies, such as high overpotential, poor conductivity, and Pb contamination, are still tremendous challenges. 6,7…”

Section: Introductionmentioning

confidence: 99%

Two-step facile synthesis of Co₃O₄@C reinforced PbO₂ coated electrode to promote efficient oxygen evolution reaction for zinc electrowinning

Jiang

Wang

et al. 2022

RSC Adv.

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Electrochemical characteristics of Co3O4-doped β-PbO2 composite anodes used in long-period zinc electrowinning

Cited by 34 publications

References 37 publications

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Homogeneous Microstructure Improving the Mechanical and Electrochemical Properties of Lead Alloys by Stirring Treatment

Two-step facile synthesis of Co₃O₄@C reinforced PbO₂ coated electrode to promote efficient oxygen evolution reaction for zinc electrowinning

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Electrochemical characteristics of Co3O4-doped β-PbO2 composite anodes used in long-period zinc electrowinning

Cited by 34 publications

References 37 publications

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Homogeneous Microstructure Improving the Mechanical and Electrochemical Properties of Lead Alloys by Stirring Treatment

Two-step facile synthesis of Co3O4@C reinforced PbO2 coated electrode to promote efficient oxygen evolution reaction for zinc electrowinning

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Two-step facile synthesis of Co₃O₄@C reinforced PbO₂ coated electrode to promote efficient oxygen evolution reaction for zinc electrowinning