An electrochemical study of the surface oxidation of arsenopyrite in alkaline media

Victor Sanchez; J. Brent Hiskey

doi:10.1007/BF02651417

An electrochemical study of the surface oxidation of arsenopyrite in alkaline media

Victor Sanchez, J. Brent Hiskey

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

The electrochemical behavior of arsenopyrite (FeAsS) electrodes in alkaline cyanide solutions has been investigated in an attempt to gain a better understanding of its dissolution chemistry. Surface oxidation reactions of arsenopyrite have been studied using cyclic voltammetry for pH values between 8.1 and 12.0 and for cyanide concentration from 10^-4 to 10^-2 M. Anodic oxidation of FeAsS appears to be sensitive to both pH and cyanide, as indicated by a characteristic peak at 0.30 V vs SHE for pH 11.3 and 10^-2 M CN^-. The anodic process corresponding to the main peak is described by the reaction: FeAsS + 9H₂O = FeOOH + H₂AsO₃^- + SO₄^2- + 15H⁺ + 12 e^- The oxidation of the H₂AsO₃^-to HAsO₄^2- is detected by a second wave at higher potentials under quiescent conditions. At high pH, the main peak is insensitive to the presence of cyanide, whereas at low-alkalinity this peak is sensitive to cyanide.

Original language	English (US)
Pages (from-to)	943-949
Number of pages	7
Journal	Metallurgical Transactions B
Volume	19
Issue number	6
DOIs	https://doi.org/10.1007/BF02651417
State	Published - Dec 1988
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry
General Materials Science

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10.1007/BF02651417

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title = "An electrochemical study of the surface oxidation of arsenopyrite in alkaline media",

abstract = "The electrochemical behavior of arsenopyrite (FeAsS) electrodes in alkaline cyanide solutions has been investigated in an attempt to gain a better understanding of its dissolution chemistry. Surface oxidation reactions of arsenopyrite have been studied using cyclic voltammetry for pH values between 8.1 and 12.0 and for cyanide concentration from 10-4 to 10-2 M. Anodic oxidation of FeAsS appears to be sensitive to both pH and cyanide, as indicated by a characteristic peak at 0.30 V vs SHE for pH 11.3 and 10-2 M CN-. The anodic process corresponding to the main peak is described by the reaction: FeAsS + 9H2O = FeOOH + H2AsO3 - + SO4 2- + 15H+ + 12 e - The oxidation of the H2AsO3 -to HAsO4 2- is detected by a second wave at higher potentials under quiescent conditions. At high pH, the main peak is insensitive to the presence of cyanide, whereas at low-alkalinity this peak is sensitive to cyanide.",

author = "Victor Sanchez and Hiskey, {J. Brent}",

year = "1988",

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doi = "10.1007/BF02651417",

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T1 - An electrochemical study of the surface oxidation of arsenopyrite in alkaline media

AU - Sanchez, Victor

AU - Hiskey, J. Brent

PY - 1988/12

Y1 - 1988/12

N2 - The electrochemical behavior of arsenopyrite (FeAsS) electrodes in alkaline cyanide solutions has been investigated in an attempt to gain a better understanding of its dissolution chemistry. Surface oxidation reactions of arsenopyrite have been studied using cyclic voltammetry for pH values between 8.1 and 12.0 and for cyanide concentration from 10-4 to 10-2 M. Anodic oxidation of FeAsS appears to be sensitive to both pH and cyanide, as indicated by a characteristic peak at 0.30 V vs SHE for pH 11.3 and 10-2 M CN-. The anodic process corresponding to the main peak is described by the reaction: FeAsS + 9H2O = FeOOH + H2AsO3 - + SO4 2- + 15H+ + 12 e - The oxidation of the H2AsO3 -to HAsO4 2- is detected by a second wave at higher potentials under quiescent conditions. At high pH, the main peak is insensitive to the presence of cyanide, whereas at low-alkalinity this peak is sensitive to cyanide.

AB - The electrochemical behavior of arsenopyrite (FeAsS) electrodes in alkaline cyanide solutions has been investigated in an attempt to gain a better understanding of its dissolution chemistry. Surface oxidation reactions of arsenopyrite have been studied using cyclic voltammetry for pH values between 8.1 and 12.0 and for cyanide concentration from 10-4 to 10-2 M. Anodic oxidation of FeAsS appears to be sensitive to both pH and cyanide, as indicated by a characteristic peak at 0.30 V vs SHE for pH 11.3 and 10-2 M CN-. The anodic process corresponding to the main peak is described by the reaction: FeAsS + 9H2O = FeOOH + H2AsO3 - + SO4 2- + 15H+ + 12 e - The oxidation of the H2AsO3 -to HAsO4 2- is detected by a second wave at higher potentials under quiescent conditions. At high pH, the main peak is insensitive to the presence of cyanide, whereas at low-alkalinity this peak is sensitive to cyanide.

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An electrochemical study of the surface oxidation of arsenopyrite in alkaline media

Abstract

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