Cyclic voltammetry and potentiodynamic polarization studies of chalcopyrite concentrate in glycine medium

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-02
Major/Subject
Mcode
Degree programme
Language
en
Pages
10
545-554
Series
Transactions of Nonferrous Metals Society of China (English Edition), Volume 31, issue 2
Abstract
Cyclic voltammetry and potentiodynamic polarization analyses were utilized to investigate the mechanism and kinetics of glycine leaching reactions for chalcopyrite. The effects of pH (9–12), temperature (30–90 °C) and glycine concentration (0–2 mol/L) on corrosion current density, corrosion potential and cyclic voltammograms were investigated using chalcopyrite concentrate–carbon paste electrodes. Results showed that an increase in the glycine concentration from 0 to 2 mol/L led to an increased oxidation peak current density. Under the same conditions, corrosion current density was found to change from approximately 28 to 89 μA/cm whereas corrosion potential was decreased from –80 to –130 mV. Elevated temperatures enhanced the measured current densities up to 60 °C; however, above this level, current density was observed to decrease. A similar current density behavior was determined with pH. A pH change from 9 to 10.5 resulted in an increase in current density and pH higher than 10.5 gave rise to a reduced current density. In addition, the thermodynamic stability of copper and iron oxides was found to increase at higher temperatures.
Description
Keywords
chalcopyrite concentrate, corrosion current density, corrosion potential, electrochemical behavior, glycine
Other note
Citation
Khezri, M, Rezai, B, Abdollahzadeh, A A, Wilson, B P, Molaeinasab, M & Lundström, M 2021, ' Cyclic voltammetry and potentiodynamic polarization studies of chalcopyrite concentrate in glycine medium ', Transactions of Nonferrous Metals Society of China (English Edition), vol. 31, no. 2, pp. 545-554 . https://doi.org/10.1016/S1003-6326(21)65516-4