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 degrees 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 mu A/cm(2), whereas corrosion potential was decreased from -80 to -130 mV. Elevated temperatures enhanced the measured current densities up to 60 degrees 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.

Automated summary

The mechanism and kinetics of glycine leaching reactions for chalcopyrite were investigated using cyclic voltammetry and potentiodynamic polarization analyses. Factors such as pH, temperature, and glycine concentration were found to affect corrosion current density, corrosion potential, and cyclic voltammograms. Increasing glycine concentration led to higher oxidation peak current density, while elevated temperatures initially increased measured current densities before causing a decrease. pH changes also had a significant impact on current density behavior.