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

Maryam KHEZRI, Bahram REZAI*, Ali Akbar ABDOLLAHZADEH, Benjamin P. WILSON, Mehdi MOLAEINASAB, Mari LUNDSTRÖM

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

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.

AlkuperäiskieliEnglanti
Sivut545-554
Sivumäärä10
JulkaisuTransactions of Nonferrous Metals Society of China (English Edition)
Vuosikerta31
Numero2
DOI - pysyväislinkit
TilaJulkaistu - helmikuuta 2021
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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