Electrochemical behavior of arsenopyrite in alkaline media

V. M. Sanchez, J Brent Hiskey

Research output: Contribution to journalArticle

18 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalMinerals and Metallurgical Processing
Volume8
Issue number1
StatePublished - Feb 1991
Externally publishedYes

Fingerprint

arsenopyrite
oxidation
arsenite
cyanide
Electrochemical oxidation
dissolution
sulfur
Cyanides
Sulfur
electron
Cyclic voltammetry
electrochemical oxidation
Dissolution
cyanides
Oxidation
dissolving
Electrons
experiment
chemistry
Experiments

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys

Cite this

Electrochemical behavior of arsenopyrite in alkaline media. / Sanchez, V. M.; Hiskey, J Brent.

In: Minerals and Metallurgical Processing, Vol. 8, No. 1, 02.1991, p. 1-6.

Research output: Contribution to journalArticle

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