Mechanistic and kinetic aspects of silver dissolution in cyanide solutions

J. B. Hiskey, V. M. Sanchez

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


The factors influencing the dissolution kinetics of pure silver in cyanide solution have been analysed in terms of an electrochemical mechanism. A kinetic model is presented which incorporates coupled diffusion and charge transfer for the anodic branch, and combined diffusion, adsorption and charge transfer for the cathodic branch. The anodic oxidation of silver has been investigated using a silver rotating-disc electrode for concentrations between 10-3 and 10-1m NaCN. Oxygen reduction on silver has been studied at oxygen partial pressures between 0.104 and 1.00 atm. Mechanistic aspects of the oxygen discharge reaction are considered in explaining the kinetic differences between gold and silver dissolution in cyanide solution. It is shown that under conditions typical of conventional cyanidation gold dissolves measurably faster than silver.

Original languageEnglish (US)
Pages (from-to)479-487
Number of pages9
JournalJournal of Applied Electrochemistry
Issue number3
StatePublished - May 1990
Externally publishedYes

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry
  • Materials Chemistry


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