Mechanistic and kinetic aspects of silver dissolution in cyanide solutions

J Brent Hiskey, V. M. Sanchez

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

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
Volume20
Issue number3
DOIs
StatePublished - May 1990

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Cyanides
Silver
Dissolution
Kinetics
Oxygen
Gold
Charge transfer
Anodic oxidation
Rotating disks
Partial pressure
Adsorption
Electrodes

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Mechanistic and kinetic aspects of silver dissolution in cyanide solutions. / Hiskey, J Brent; Sanchez, V. M.

In: Journal of Applied Electrochemistry, Vol. 20, No. 3, 05.1990, p. 479-487.

Research output: Contribution to journalArticle

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