Abstract
In this paper, the galvanic effect of pyrite and arsenopyrite during the leaching pretreatment of gold ores was determined with the use of electrochemical testing (open circuit potential, linear sweep voltammetry, Tafel, and electrochemical impedance spectroscopy (EIS)) and frontier orbit calculations. The results show that (i) the linear sweep voltammetry curve and Tafel curve of the galvanic pair are similar to those of arsenopyrite, (ii) the corrosion behavior of the galvanic pair is consistent with that of arsenopyrite, and (iii) the galvanic effect promotes the corrosion of arsenopyrite by simultaneously increasing the cathode and anode currents and reducing oxidation resistance. The frontier orbit calculation explains the principle of the galvanic effect of pyrite and arsenopyrite from the view of quantum mechanics.
Highlights
The chemical formulas of pyrite and arsenopyrite are FeS2 and FeAsS, respectively
The presence of pyrite accelerates the oxidation of arsenopyrite in the galvanic pair
HQ0211 strain solutions was determined to improve our understanding of the pyrite/arsenopyrite galvanic galvanic effect
Summary
The chemical formulas of pyrite and arsenopyrite are FeS2 and FeAsS, respectively. Pyrite and arsenopyrite are the two most important gold-containing minerals in gold ores [1,2,3,4]. Fine-grained or submicroscopic gold is disseminated within pyrite and arsenopyrite, thereby rendering gold inaccessible to cyanide solutions [5]. Dissolving pyrite and arsenopyrite is the main objective of the biological pretreatment of gold ores [6,7,8]. The oxidation reactions of pyrite and arsenopyrite during bioleaching have been widely discussed. Komnitsas et al [5,9] and Smith et al [10] described the aqueous oxidation of pyrite using stoichiometric chemical reactions: FeS2 + O2 + H2 O → Fe2+ + 2SO24− + 2H+
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
