Electrochemical evaluation of the surface of chalcopyrite during dissolution in sulfuric acid solution

Bioelectrochemical Changes during the Early Stages of Chalcopyrite Interaction with Acidithiobacillus Thiooxidans and Leptospirillum sp.

“…Thus, the removal of reactive RSS enhances the diffusion of chemical species through its porous and spongy structure (Figure 5c), which improved the Cu bioleaching kinetics by diffusion process [20,21]. This porous and spongy RSS are characteristic of a catalytic process and may be formed because of vacancies or point defects during the biooxidation [22].…”

Peroxodisulfate assisted leaching of chalcopyrite

“…Chalcopyrite is a semiconductor and this property allows its corrosion behavior to be monitored electrochemically (Eghbalnia and Dixon, 2011;Ghahremaninezhad et al, 2010;Hiroyoshi et al, 2004). The mechanism by which peroxodisulfate enhanced Cu leaching rates was investigated by measuring corrosion rates of the chalcopyrite mineral sample using Tafel analysis and electrochemical impedance spectroscopy (EIS) (Bard and Faulkner, 1980).…”

Kinetics of Ferric Ion Reduction on Chalcopyrite and its Influence on Leaching up to 150 °C

“…Most of the previous chemical or electrochemical research has placed emphasis on understanding the kinetics and mechanisms of the oxidative processes [10][11][12][13][14][15][16] or the cathodic reduction reactions of chalcopyrite itself [17][18][19][20]. However, the cathodic reduction of ferric ions or dissolved molecular oxygen on CuFeS 2 is also of great significance, due to the fact that they can affect the overall leaching rate of the process and the actual reduction behavior of ferric ions is vital to obtain the true leaching rate, as predicted by mixed potential theory.…”