Kinetics of Pb and Pb-Ag anodes for zinc electrowinning. I: Formation of PbSO4 layers at low polarization

Kinetics of Pb and Pb-Ag anodes for zinc electrowinning. I: Formation of PbSO4 layers at low polarization

Electrochemical impedance spectroscopy and scanning electron microscopy have been utilized to investigate the mechanism of reactions taking place on Pb and PbAg alloy anodes in acidic zinc sulphate electrolytes, during the formation of PbSO4 layers in the potential domain (0.9 to 1.1 V/SSE). Indepe...

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Veröffentlicht in:Electrochimica acta 1995-06, Vol.40 (8), p.939-948
Hauptverfasser: REROLLE, C, WIART, R
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Sprache:eng
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Applied sciences
Chemical Sciences
Exact sciences and technology
Hydrometallurgy
Metals. Metallurgy
Production of metals
Production of non ferrous metals. Process materials
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WIART, R
description Electrochemical impedance spectroscopy and scanning electron microscopy have been utilized to investigate the mechanism of reactions taking place on Pb and PbAg alloy anodes in acidic zinc sulphate electrolytes, during the formation of PbSO4 layers in the potential domain (0.9 to 1.1 V/SSE). Independent of the Ag content, the anode behaviour is essentially determined by the electrolysis time. From a comparison of experimental data to a kinetic model for the frsol|Pb/PbOn/PbSO4 electrode, it is shown that the layer growth is first controlled by the solid state diffusion of SO2−4ions, and then by a chemical step associated with a change in charge carriers, from O2+v vacancies in the PbOn sublayer into Pb2+ions in the PbSO4 layer. In Mn2+-containing electrolytes, the additional formation of MnO2 occurs under diffusion control of the Mn2+ oxidation, and it modifies both the layer properties and the kinetics of reactions.
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subjects Applied sciences
Chemical Sciences
Exact sciences and technology
Hydrometallurgy
Metals. Metallurgy
Production of metals
Production of non ferrous metals. Process materials
title Kinetics of Pb and Pb-Ag anodes for zinc electrowinning. I: Formation of PbSO4 layers at low polarization
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