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Galvanic interaction between chalcopyrite and manganese dioxide in sulfuric acid medium

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Abstract

Dissolution of chalcopyrite and managanese dioxide minerals in the presence of each other in sulfuric acid medium was studied using compact disc electrodes of the minerals under various H2SO4 concentrations (0.05 to 0.5 M). [H+] had a positive effect on the reaction rate. Strong galvanic interaction was observed to take place between chalcopyrite and manganese dioxide, the galvanic interaction predominating over the individual dissolution (self-corrosion) rates. Evans diagrams constructed from polarization curves of the two minerals were helpful in interpreting the leaching data. The electrochemical nature of the dissolution reaction was analyzed through application of the Butler-Volmer equation and was confirmed from polarization measurements conducted with the respective mineral electrodes.

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Abbreviations

Aa, Ac:

area of anode and cathode

kaf, kab:

forward and reverse rate constants for the anodic reaction

kcf, kcb:

forward and reverse rate constants for the cathodic reaction

na, nc:

number of electrons involved in the rate-controlling step of anodic and cathodic reactions

βa, βc:

transfer coefficients for anodic and cathodic reactions

E :

electrode potential

F :

Faraday number

R:

universal gas constant

Za, Zc:

total number of electrons transferred in the anodic and the cathodic processes

T :

absolute temperature

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Authors and Affiliations

  1. BJB College, 751-013, Bhubaneswar, India

    B. P. Gantayat (Lecturer, Senior Scale)

  2. the Regional Research Laboratory, 751 013, Bhubaneswar, India

    P. C. Rath (Scientist), R. K. Paramguru (Scientist-F) & S. B. Rao (Scientist-F)

Authors
  1. B. P. Gantayat
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  2. P. C. Rath
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  3. R. K. Paramguru
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  4. S. B. Rao
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Gantayat, B.P., Rath, P.C., Paramguru, R.K. et al. Galvanic interaction between chalcopyrite and manganese dioxide in sulfuric acid medium. Metall Mater Trans B 31, 55–61 (2000). https://doi.org/10.1007/s11663-000-0130-z

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  • DOI: https://doi.org/10.1007/s11663-000-0130-z

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