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Journal of Applied Electrochemistry

, Volume 35, Issue 2, pp 131–137 | Cite as

Effects of sulfide and lead nitrate addition to a gold cyanidation circuit using potentiodynamic measurements

  • O. May
  • S. Jin
  • E. Ghali
  • G. Deschênes
Article

Abstract

Corrosion potentiodynamic polarization experiments on a gold electrode in a cyanide solution with 0–30 ppm lead addition and 0–20 ppm sulfide were carried out. Solutions containing 300 ppm NaCN, adjusted to a pH 11.1 by NaOH and bubbled with air were used at atmospheric pressure and room temperature. If the concentration of lead ions was equal or larger than the sulfide ions a change of potential towards the more negative potential (a potential drop) was observed and this was accompanied by a significant increase in the corrosion rate (up to 10 mm y-1 in certain circumstances). If lead nitrate was added to a solution with a gold electrode that had been previously passivated by sulfides, the corrosion rate typically rose from about 0.3 to 0.95 mm y-1. The addition of lead nitrate to sulfides in cyanide solution can create a synergetic effect which results in an increase in dissolution rates of gold in cyanide solutions and this is accompanied by a drop in the corrosion potential of gold and a dramatic decline in thiocyanate and free sulfide concentrations.

Keywords

corrosion rate sulfide lead nitrate gold cyanidation 

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Copyright information

© Springer 2005

Authors and Affiliations

  • O. May
    • 1
  • S. Jin
    • 1
  • E. Ghali
    • 1
  • G. Deschênes
    • 2
  1. 1.Department of Mining, Metallurgical and Materials EngineeringLaval UniversityQuebecCanada
  2. 2.Mining and Mineral Sciences LaboratoriesCANMETOttawaCanada

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