|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Electrochemical Behavior of Chalcopyrite in Presence of Sodium Peroxodisulfate
||Hojat Naderi, Jochen Petersen
|On-Site Speaker (Planned)
In this research assisted leaching of chalcopyrite using sodium peroxodisulfate was studied using solid paraffin-based carbon paste (CPE) and chalcopyrite mineral electrodes, and the behavior of these two was compared. Electrochemical techniques such as Tafel analysis and electrochemical impedance spectroscopy (EIS) were used to investigate the surface reactions. Various parameters, such as pH, Na2S2O8 concentration and simultaneous presence of ferric and peroxodisulfate ions, were studied and the results were compared. The results suggest that decreasing the pH results in trans-passive dissolution of chalcopyrite. Addition of sodium peroxodisulfate increases the exchange current density of the corrosion process and prevents formation of a passive layer on the surface of the electrode. Lower charge transfer resistance was obtained at higher concentrations of Na2S2O8 for both the CPE and solid mineral electrode. Equivalent electrochemical circuits were modeled and the model parameters were compared.
||Planned: At-meeting proceedings