Electrochemical behavior of arsenopyrite in alkaline media

V. M. Sanchez; J. B. Hiskey

doi:10.1007/bf03402923

Electrochemical behavior of arsenopyrite in alkaline media

V. M. Sanchez, J. B. Hiskey

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

25 Scopus citations

Abstract

Electrochemical oxidation of arsenopyrite (FeAsS) has been investigated as an attempt to gain a better understanding of its dissolution chemistry. Rest potential measurements, cyclic voltammetry and constant potential experiments were conducted in the pH range from 8 to 12 in the absence and the in the presence of cyanide. A two-step reaction sequence is suggested by the electrochemical measurements. sequence is suggested by the electrochemical measurements. The initial step is described by: FeAsS + 6H₂O = Fe(OH)₃+ H₂AsO₃- + S° + 7H⁺ + 6 e. The second step involves the oxidation of the arsenite and sulfur according to the following reactions: H₂AsO₃^- + H₂O = HAsO₄²-$/ + 3 H⁺ 2 e and S° + 4 H₂O = SO₄^2- + 3 H⁺ + 6 e. Stoichiometric determinations confirm that 14 electrons are involved in the overall reaction.

Original language	English (US)
Pages (from-to)	1-6
Number of pages	6
Journal	Minerals & Metallurgical Processing
Volume	8
Issue number	1
DOIs	https://doi.org/10.1007/bf03402923
State	Published - 1991
Externally published	Yes

ASJC Scopus subject areas

Control and Systems Engineering
General Chemistry
Geotechnical Engineering and Engineering Geology
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/bf03402923

Cite this

@article{ea2f0e08f7194c0698c48697e1bf34d2,

title = "Electrochemical behavior of arsenopyrite in alkaline media",

abstract = "Electrochemical oxidation of arsenopyrite (FeAsS) has been investigated as an attempt to gain a better understanding of its dissolution chemistry. Rest potential measurements, cyclic voltammetry and constant potential experiments were conducted in the pH range from 8 to 12 in the absence and the in the presence of cyanide. A two-step reaction sequence is suggested by the electrochemical measurements. sequence is suggested by the electrochemical measurements. The initial step is described by: FeAsS + 6H2O = Fe(OH)3+ H2AsO3- + S° + 7H+ + 6 e. The second step involves the oxidation of the arsenite and sulfur according to the following reactions: H2AsO3- + H2O = HAsO42-$/ + 3 H+ 2 e and S° + 4 H2O = SO42- + 3 H+ + 6 e. Stoichiometric determinations confirm that 14 electrons are involved in the overall reaction.",

author = "Sanchez, {V. M.} and Hiskey, {J. B.}",

year = "1991",

doi = "10.1007/bf03402923",

language = "English (US)",

volume = "8",

pages = "1--6",

journal = "Minerals & Metallurgical Processing",

issn = "0747-9182",

publisher = "Society for Mining, Metallurgy and Exploration",

number = "1",

}

TY - JOUR

T1 - Electrochemical behavior of arsenopyrite in alkaline media

AU - Sanchez, V. M.

AU - Hiskey, J. B.

PY - 1991

Y1 - 1991

N2 - Electrochemical oxidation of arsenopyrite (FeAsS) has been investigated as an attempt to gain a better understanding of its dissolution chemistry. Rest potential measurements, cyclic voltammetry and constant potential experiments were conducted in the pH range from 8 to 12 in the absence and the in the presence of cyanide. A two-step reaction sequence is suggested by the electrochemical measurements. sequence is suggested by the electrochemical measurements. The initial step is described by: FeAsS + 6H2O = Fe(OH)3+ H2AsO3- + S° + 7H+ + 6 e. The second step involves the oxidation of the arsenite and sulfur according to the following reactions: H2AsO3- + H2O = HAsO42-$/ + 3 H+ 2 e and S° + 4 H2O = SO42- + 3 H+ + 6 e. Stoichiometric determinations confirm that 14 electrons are involved in the overall reaction.

AB - Electrochemical oxidation of arsenopyrite (FeAsS) has been investigated as an attempt to gain a better understanding of its dissolution chemistry. Rest potential measurements, cyclic voltammetry and constant potential experiments were conducted in the pH range from 8 to 12 in the absence and the in the presence of cyanide. A two-step reaction sequence is suggested by the electrochemical measurements. sequence is suggested by the electrochemical measurements. The initial step is described by: FeAsS + 6H2O = Fe(OH)3+ H2AsO3- + S° + 7H+ + 6 e. The second step involves the oxidation of the arsenite and sulfur according to the following reactions: H2AsO3- + H2O = HAsO42-$/ + 3 H+ 2 e and S° + 4 H2O = SO42- + 3 H+ + 6 e. Stoichiometric determinations confirm that 14 electrons are involved in the overall reaction.

UR - http://www.scopus.com/inward/record.url?scp=0026107397&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026107397&partnerID=8YFLogxK

U2 - 10.1007/bf03402923

DO - 10.1007/bf03402923

M3 - Article

AN - SCOPUS:0026107397

SN - 0747-9182

VL - 8

SP - 1

EP - 6

JO - Minerals & Metallurgical Processing

JF - Minerals & Metallurgical Processing

IS - 1

ER -

Electrochemical behavior of arsenopyrite in alkaline media

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this