Study on Electrochemical Performance of Dimensionally Stable Anodes during Zinc Electrowinning

• Autorzy: Zhang Wei , Houlachi Georges , Haskouri Sanae , Ghali Edward

Identyfikatory

DOI

10.24425/amm.2023.146212

• Języki publikacji: EN

Abstrakty

EN

In zinc electrowinning, small amounts of manganese ions additives are needed in the electrolyte to reduce the corrosion of anodes and minimize the contamination of cathodic zinc by dissolved lead. However, excess manganese oxide could cover the dimensionally stable anodes (DSA) surface and decrease their service life. Additives of phosphoric acid are put in the electrolyte to complex the manganic Mn³⁺ ion and hence reduce its disproportionation to MnO₂. In the investigation, phosphoric acid was added to sulfuric acid or zinc electrolytes, and conventional and recent electrochemical measurements were carried out to examine electrochemical behaviour of DSA (Ti/IrO₂-Ta₂O₅) anode during zinc electrolysis at 48 mA/cm² and 39°C. It was observed that the anodic potentials of DSA anodes were lower by 27 mV after 5 h polarization in the zinc electrolyte containing 35 g/L phosphoric acid at 39°C. Electrochemical impedance measurements show that the addition of 35 ml/L H₃PO₄ to the zinc electrolyte can increase impedance resistances of the DSA mesh anodes. Cyclic voltammogram studies (CV) at a scan rate of 5 mV/s without agitation show that the oxidation peak in the solution with 35 ml/L phosphoric acid addition is highest, followed by that with 17 ml/L phosphoric acid addition and that without addition of phosphoric acid.

Słowa kluczowe

EN

zinc electrowinning; dimensionally stable anode; manganese ions; phosphoric acid; electrochemical performance

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2023
• Tom: Vol. 68, iss. 4
• Strony: 1457--1466
• Opis fizyczny: Bibliogr. 28 poz., rys., tab., wzory

Twórcy

autor

Zhang Wei

• Hunan University of Technology, School of Metallurgical, ZhuZhou, China, 412002
• Laval University, Department of Mining, Metallurgical and Materials Engineering, Quebec, QC, Canada, G1K 7P4

• https://orcid.org/0000-0003-2502-3498

autor

Houlachi Georges

• Hydro-Québec Research Institute, Shawinigan, QC, Canada, G9N 7N5

• https://orcid.org/0000-0003-2708-0592

autor

Haskouri Sanae

• Hunan University of Technology, School of Metallurgical, ZhuZhou, China, 412002

• https://orcid.org/0000-0003-0355-5709

autor

Ghali Edward

• Hunan University of Technology, School of Metallurgical, ZhuZhou, China, 412002

• https://orcid.org/0000-0001-8164-6505

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Uwagi

1. The authors are grateful to the Project (RDCPJ 346365-06) from the Natural Sciences and Engineering Research Council of Canada, and Project (2019JJ60009) by the Hunan Provincial Natural Science Foundation.

2. Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)