Cyclic voltammetry and potentiodynamic polarization studies of chalcopyrite concentrate in glycine medium
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 ℃) 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/cm2, whereas corrosion potential was decreased from -80 to -130 mV. Elevated temperatures enhanced the measured current densities up to 60 ℃; 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.
glycinecorrosion current densitycorrosion potentialelectrochemical behaiorchalcopyrite concentrate
Maryam KHEZRI、Bahram REZAI、Ali Akbar ABDOLLAHZADEH、Benjamin P.WILSON、Mehdi MOLAEINASAB、Mari LUNDSTR?M
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Department of Mining and Metallurgical Engineering,Amirkabir University of Technology (Tehran Polytechnic),Tehran,Iran
Department of Mining Engineering,University of Kashan,Kashan,Iran
Department of Chemical and Metallurgical Engineering (CMET),School of Chemical Engineering,Aalto University,P. O. Box 16200,Espoo,Finland
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