Formation mechanism of manganese compounds in acidic electrolytes of copper

Ipinza, J.; Ibáñez, Juan Patricio; Pagliero, A.; Vergara, F.

doi:10.3989/revmetalm.2007.v43.i1.46

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…67,68 Some mechanisms for electrochemical oxidation of Mn(II) on the leadbased alloys and formation of MnO 2 layer also has been proposed previously. [69][70][71][72][73] In order to understand the effects of Mn(II) ions in the electrolyte on the electrochemical behavior of the composite anodes compared with the Pb anode, CV and potentiodynamic experiments were performed on the Pb-10MnO 2 and Pb samples in solutions containing different concentrations of manganese ions. Figure 9a and 9b report the cyclic voltammograms of the Pb-10MnO 2 in the electrolyte containing 0, 0.5 and 3 g/L Mn(II) and those of the Pb in absence and presence of manganese ions in the solution, respectively.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Reactions on Metal-Matrix Composite Anodes for Metal Electrowinning

Mohammadi

Alfantazi

2013

J. Electrochem. Soc.

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In this study, Pb-MnO 2 composite anodes were developed through single-action powder pressing. The effect of MnO 2 content of the composite anodes on the physical and electrochemical properties of the samples were investigated and compared with those of the pure pressed Pb and a commercial Pb-Sn-Ca electrowinning anode. Surface morphology of the fabricated samples was examined using scanning electron microscopy (SEM). Cyclic voltammetry and potentiodynamic polarization experiments were performed in 180 g/l sulphuric acid solution at 37 ± 0.5 • C to study the surface reactions of the anodes and their performance in terms of oxygen evolution reaction (OER) rate and potential. The results indicated that the addition of MnO 2 improved the electrocatalytic activity of the lead anode for oxygen evolution. Oxidation of lead was also influenced by MnO 2 particles. The effects of manganese ions in the electrolyte on the electrochemical performance of the composite anodes were also studied. Results showed that manganese ions, depending on concentration, can have both promoting and suppressive effects on the OER on the composite anodes.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Reactions on Metal-Matrix Composite Anodes for Metal Electrowinning

Mohammadi

Alfantazi

2013

J. Electrochem. Soc.

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Composition and morphology of the film formed on a lead alloy under conditions typical of the electro-winning of copper

Nguyen

Atrens

2009

Hydrometallurgy

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Effectiveness of vertical subsurface wetlands for iron and manganese removal from wastewater in drinking water treatment plants

2019

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Population growth and urbanization pose a greater pressure for the treatment of drinking water. Additionally, different treatment units, such as decanters and filters, accumulate high concentrations of iron (Fe) and manganese (Mn), which in many cases can be discharged into the environment without any treatment when maintenance is performed. Therefore, this paper evaluates the effectiveness of vertical subsurface wetlands for Fe and Mn removal from wastewater in drinking water treatment plants, taking a pilot scale wetland with an ascending gravel bed with two types of plants: C. esculenta and P. australis in El Hormiguero (Cali, Colombia), as an example. The pilot system had three upstream vertical wetlands, two of them planted and the third one without a plant used as a control. The wetlands were arranged in parallel and each formed by three gravel beds of different diameter. The results showed no significant difference for the percentage of removal in the three wetlands for turbidity (98 %), Fe (90 %), dissolved Fe (97 %) and Mn (98 %). The dissolved oxygen presented a significant difference between the planted wetlands and the control. C. esculenta had the highest concentration of Fe in the root with (103.5 ± 20.8) µg/g ; while P. australis had the highest average of Fe concentrations in leaves and stem with (45.7 ± 24) µg/g and (41.4 ± 9.1) µg/g, respectively. It is concluded that subsurface wetlands can be an interesting alternative for wastewater treatment in the maintenance of drinking water treatment plants. However, more research is needed for the use of vegetation or some technologies for the removal or reduction of the pollutant load in wetlands, since each drinking water treatment plant will require a treatment system for wastewater, which in turn requires a wastewater treatment system as well.

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Formation mechanism of manganese compounds in acidic electrolytes of copper

Cited by 3 publications

References 10 publications

Electrochemical Reactions on Metal-Matrix Composite Anodes for Metal Electrowinning

Electrochemical Reactions on Metal-Matrix Composite Anodes for Metal Electrowinning

Composition and morphology of the film formed on a lead alloy under conditions typical of the electro-winning of copper

Effectiveness of vertical subsurface wetlands for iron and manganese removal from wastewater in drinking water treatment plants

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