Leaching and electrochemical behavior of gold in iodine solutions part I. Dissolution kinetics

J. B. Hiskey, P. H. Qi

Research output: Contribution to conferencePaper

Abstract

Of the halogens, the gold iodide complexes are the most stable in aqueous solutions. A series of experiments were performed to investigate the kinetics and mechanism of the leaching reaction between gold and iodide. Using a rotation disk technique, the effects of rotation speed, iodide and iodine concentration, temperature, pH and in the presence of different electrolytes were measured. Oxygen and hydrogen peroxide were also examined as oxidants in the iodide system. The first order reaction rate was found with respect to I3- and half order reaction rate with respect to I-. The comparision of gold leaching between iodide and cyanide is also presented, in which a rate constant of about 2.6×10-9 mol/cm2·sec for 10-2 M I- and 5×10-3 M I2 was obtained. This value is close to that for typical cyanidation. Cyclic voltammetry experiments were also performed to examine the electrochemical nature of the reaction.

Original languageEnglish (US)
Pages8p 112
StatePublished - Jan 1 1990
EventSME Annual Meeting - Salt Lake City, UT, USA
Duration: Feb 26 1990Mar 1 1990

Other

OtherSME Annual Meeting
CitySalt Lake City, UT, USA
Period2/26/903/1/90

ASJC Scopus subject areas

  • Engineering(all)

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    Hiskey, J. B., & Qi, P. H. (1990). Leaching and electrochemical behavior of gold in iodine solutions part I. Dissolution kinetics. 8p 112. Paper presented at SME Annual Meeting, Salt Lake City, UT, USA, .