Effect of cobalt added to electrolyte on corrosion rate of Pb-Sb anodes in copper electrowinning

Gendron, A. S.; Enel, V.A.; Abe, Shin‐ichiro

doi:10.1179/000844375795050436

Cited by 10 publications

(5 citation statements)

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“…While in the presence of only Co 2+ ion, oxidation of Co 2+ ion to Co 3+ ion (2) allows the facile oxidation of H 2 O in accordance with (3) and leads to lower oxygen overpotential [10,21]. An important result found in the present investigation is the increase in the anode potential when a small enough [Cl − ] o ≅ 5-100 ppm is added to the electrolyte containing 150 ppm Co 2+ (aq); nearly 50 mV increase in the anode potential is observed.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Added Chloride Ion on Electrodeposition of Copper from a Simulated Acidic Sulfate Bath Containing Cobalt Ions

Panda

2013

ISRN Metallurgy

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The effects of added chloride ion on copper electrodeposition was studied using Pb-Sb anode and a stainless steel cathode in an acidic sulfate bath containing added Co2+ ion. The presence of added chloride ion in the electrolyte solution containing 150 ppm of Co2+ ion was found to increase the anode and the cell potentials and decrease the cathode potential. Linear sweep voltammetry (LSV) was used to study the effects of added chloride ion on the anodic process during the electrodeposition of copper in the presence of added ppm; the oxygen evolution potential is polarised by adding 10 ppm chloride ion at current densities (≥150 A/m2), and further increase in chloride ion concentration increases the polarisation of oxygen evolution reaction more at higher current densities. X-ray diffraction (XRD) showed that added chloride ion and added Co2+ ion changed the preferred crystal orientations of the copper deposits differently. Scanning electron microscopy (SEM) indicated that the surface morphology of the copper deposited in the presence of added chloride ion and added Co2+ ion has well-defined grains.

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Section: Discussionmentioning

confidence: 99%

“…These attempts could bring significant decrease in cell voltage and power consumption through lessening of the anode potential or anode overpotential. Bivalent cobalt ion is a very useful addendum in copper electrodeposition [10][11][12] due to the following reasons.…”

Section: Introductionmentioning

confidence: 99%

Effects of Added Chloride Ion on Electrodeposition of Copper from a Simulated Acidic Sulfate Bath Containing Cobalt Ions

Panda

2013

ISRN Metallurgy

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“…Andersen et al 2 put forward the view that the reduction in the corrosion of lead caused by cobalt is due to the formation of cobalt(III) oxide within the pores of the lead(IV) dioxide layer. Gendron et al 3 showed that, as well as reducing the corrosion of lead, the presence of cobalt at concentrations in the range 0 . 008-3 .…”

Section: Effect Of Cobalt Concentration On Corrosion Of Leadmentioning

confidence: 99%

“…Lead anodes and their corrosion have been the subject of research for a number of years. [1][2][3][4][5][6] The study of the corrosion of lead anodes caused by current interruptions in copper electrowinning plants is more recent and has been discussed in detail elsewhere, 7 so only a brief account of this work will be given here.…”

Section: Introductionmentioning

confidence: 99%

“…7 Various authors have studied the effect of impurities and additives on lead anode corrosion during plant operation. 1,3,[8][9][10][11] Low concentrations of cobalt in the electrolyte (120 ppm or less) are known to have a marked protective effect on lead anodes. Strong oxidants promote the formation or preserve the integrity of protective oxide layers on metals and alloys capable of passivation.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion and protection of lead anodes in acidic copper sulphate solutions

Cifuentes¹,

Astete²,

Crisóstomo³

et al. 2005

Corrosion Engineering, Science and Technology

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It is known that lead anodes used in the industrial extraction of copper by electrolysis (electrowinning) suffer corrosion as a result of accidental or intended current interruptions. In order to improve understanding of the corrosion and protection of such anodes, the effects of the concentrations of copper, sulphuric acid, cobalt, iron, manganese, chloride and an organic additive (guar) on the corrosion of lead have been studied by means of weight loss tests and surface analysis techniques (X-ray photoelectron spectroscopy, X-ray diffraction, and wavelength dispersive spectroscopy). The rate of corrosion of lead during current interruptions increases with increasing concentration of sulphuric acid and copper, whereas it decreases markedly in the presence of cobalt and iron and, to a lesser extent, in the presence of chloride and the organic additive. Manganese is the only impurity whose presence does not reduce the rate of corrosion; it is also the only element which precipitates in significant amounts on the lead anode surface under the conditions studied. A method is proposed to establish the optimum anodic protection current density during current interruptions in electrowinning cells. Three current density ranges have been found, of which the 'high' protection range could be caused by the degree of compactness acquired by the PbO 2 layer at applied anodic current densities in excess of 60 A m 22 .

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Electrolytic Refining and Winning of Metals

Ettel¹,

Tilak²

1981

Comprehensive Treatise of Electrochemistry

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Effect of cobalt added to electrolyte on corrosion rate of Pb-Sb anodes in copper electrowinning

Cited by 10 publications

References 1 publication

Effects of Added Chloride Ion on Electrodeposition of Copper from a Simulated Acidic Sulfate Bath Containing Cobalt Ions

Effects of Added Chloride Ion on Electrodeposition of Copper from a Simulated Acidic Sulfate Bath Containing Cobalt Ions

Corrosion and protection of lead anodes in acidic copper sulphate solutions

Electrolytic Refining and Winning of Metals

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