Electrochemical behavior of arsenopyrite in alkaline media

V. M. Sanchez, J. B. Hiskey

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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 & Metallurgical Processing
Issue number1
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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