Influence of inorganic anions on electrochemical behaviour of pyrite

Antonijević, Milan M.; Dimitrijević, Mirjana; Serbula, Snezana M.; Dimitrijević, Valentina Lj.; Bogdanović, Grozdanka; Milić, Saša

doi:10.1016/j.electacta.2005.01.036

Cited by 36 publications

(23 citation statements)

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“…Previous studies of aqueous oxidation of pyrite by H 2 O 2 in different leach media found oxidation rates to vary according to HClO 4 < HCl < H 2 SO 4 (Dimitrijevic et al, 1996(Dimitrijevic et al, , 1999Antonijevic et al, 1997Antonijevic et al, , 2005. The same trend is observed for leaches conducted at 700 mV in this study; however, at 900 mV HClO 4 < HCl.…”

Section: Discussionsupporting

confidence: 78%

Redox potential (Eh) and anion effects of pyrite (FeS2) leaching at pH 1

Chandra

Gerson

2011

Geochimica et Cosmochimica Acta

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Section: Discussionsupporting

confidence: 78%

Redox potential (Eh) and anion effects of pyrite (FeS2) leaching at pH 1

Chandra

Gerson

2011

Geochimica et Cosmochimica Acta

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“…The results have also shown that the OCP increases over time and eventually reaches a steady value. This observation is probably explained by the gradual formation of the thin layer of hydrated iron oxides or adsorption of molecular oxygen and/or ferric ions on the surface of pyrite [22].…”

Section: Resultsmentioning

confidence: 96%

Influence of ferric iron on the electrochemical behavior of pyrite

Liu

Dang

et al. 2010

Ionics

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The electrochemical behavior of a pyrite electrode in a sulfuric acid solution with different concentrations of ferric iron (Fe 3+ ) was investigated using electrochemical techniques including measurements of open circuit potential, cyclic voltammetry, Tafel polarization curves and electrochemical impedance spectroscopy (EIS). The results show that the pyrite oxidation process takes place via a two-step reaction at the interface of the pyrite electrode and the electrolyte, and that a passivation film composed of elemental sulfur, polysulfides, and metal-deficient sulfide is formed during the process of the first-step reaction. Ferric iron plays an important role in the dissolution of pyrite by enhancing the direct oxidation. The Tafel polarization curves indicate that the polarization current of the pyrite electrode increases with an increase in Fe 3+ concentration. It has also been shown that the higher concentration of Fe 3+ , the more easily the pyrite can be transformed into the passivation region. Moreover, the EIS response is found to be sensitive to changes in Fe 3+ concentration.

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“…Part II deals with the use of the electrochemical measurements to estimate the rates of oxidation which are compared with the results from batch abiotic leaching of particulate pyrite. Part III summarizes the results of the effects of sulfate ion concentration and temperature on the kinetics of batch bioleaching of a pyrite concentrate Although there have been several published reports on the electrochemistry of pyrite (Peters and Majime, 1968;Biegler et al, 1975;Biegler and Swift, 1979; Osseoasare, 1988Osseoasare, , 1992Kelsall et al, 1996;Ahlberg and Broo, 1997;Fowler et al, 1999;Antonijevic et al, 2005), none of these have addressed in any detail the electrochemistry under conditions appropriate to the bioleaching of pyrite. The only detailed study (Holmes and Crundwell, 2000) presented useful information on the electrochemistry of pyrite under various conditions at low temperatures and the authors developed a conventional mixed-potential model for the oxidative dissolution of pyrite in sulfate solutions containing iron(III), iron(II) and dissolved oxygen which correlated well with the observed electrochemical data.…”

Section: Introductionmentioning

confidence: 99%

The effects of sulphate ions and temperature on the leaching of pyrite. 1. Electrochemistry

et al. 2013

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(2013) The effects of sulphate ions and temperature on the leaching of pyrite. 1. Electrochemistry. Hydrometallurgy, http://researchrepository.murdoch.edu.a/25114/ This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Studies of the cathodic reduction of iron(III) and dissolved oxygen have shown that the rate of the former is several orders of magnitude more reversible(rapid) than that of dissolved oxygen which only exhibits measurable reactivity at potentials well below the mixed potentials in the presence of iron(III). The reduction of iron(III) is inhibited by sulfate ions due to the formation of electrochemically less reactive sulfate complexes. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Influence of inorganic anions on electrochemical behaviour of pyrite

Cited by 36 publications

References 24 publications

Redox potential (Eh) and anion effects of pyrite (FeS2) leaching at pH 1

Redox potential (Eh) and anion effects of pyrite (FeS2) leaching at pH 1

Influence of ferric iron on the electrochemical behavior of pyrite

The effects of sulphate ions and temperature on the leaching of pyrite. 1. Electrochemistry

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