TITLE

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

AUTHOR(S)
May, O.; Jin, S.; Ghali, E.; Deschênes, G.
PUB. DATE
February 2005
SOURCE
Journal of Applied Electrochemistry;Feb2005, Vol. 35 Issue 2, p131
SOURCE TYPE
Academic Journal
DOC. TYPE
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.
ACCESSION #
16212752

 

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