abstract

• The improved dissolution effect of ethylene glycol and polysorbates on the leaching of chalcopyrite (CuFeS2) was studied using electrochemical techniques, such as linear voltammetry (LV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). Although the mixed potential of a chalcopyrite electrode in solutions with either ethylene glycol or polysorbates in conjunction with hydrogen peroxide lies within the potential region of passive layer formation (which is typically associated with slow kinetics), it was confirmed that the oxidation rate for these organics is enhanced. The electrochemical results show that the passive layer is present, although apparently with differences in its structure (thickness and/or porosity), which is modified as the leaching process progresses. It was found that the formation of this passive layer was delayed and/or conditioned by adsorption of organic agents on the chalcopyrite surface. However, the process of surface structure modification was different for each organic employed. © 2020

authors

• Castillo-Magallanes N.
• Cruz Gaona Roel
• Lázaro Báez María Isabel

publication date

• 2020-01-01

funding provided via

• Consejo Nacional de Ciencia y Tecnología, CONACYT  Grant

published in

• Electrochimica Acta  Journal

keywords

• Chalcopyrite; EIS; Organic agents; Passivation Aliphatic compounds; Chronoamperometry; Electrochemical impedance spectroscopy; Ethylene; Ethylene glycol; Iron compounds; Leaching; Polyols; Surface structure; Electrochemical techniques; Leaching of chalcopyrite; Leaching process; Linear Voltammetry; Oxidation process; Potential region; Sulfuric acid solution; Surface structure modification; Copper compounds

Digital Object Identifier (DOI)

• 10.1016/j.electacta.2020.136789

start page

end page

volume

• 355