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

J Brent Hiskey, P. H. Qi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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)
Title of host publicationPreprint - Society of Mining Engineers of AIME
PublisherPubl by Soc of Mining Engineers of AIME
StatePublished - 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

Fingerprint

Iodine
Leaching
Dissolution
Gold
Kinetics
Reaction rates
Cyanides
Oxidants
Hydrogen peroxide
Cyclic voltammetry
Rate constants
Experiments
Electrolytes
Oxygen
Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Hiskey, J. B., & Qi, P. H. (1990). Leaching and electrochemical behavior of gold in iodine solutions part I. Dissolution kinetics. In Preprint - Society of Mining Engineers of AIME Publ by Soc of Mining Engineers of AIME.

Leaching and electrochemical behavior of gold in iodine solutions part I. Dissolution kinetics. / Hiskey, J Brent; Qi, P. H.

Preprint - Society of Mining Engineers of AIME. Publ by Soc of Mining Engineers of AIME, 1990.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hiskey, JB & Qi, PH 1990, Leaching and electrochemical behavior of gold in iodine solutions part I. Dissolution kinetics. in Preprint - Society of Mining Engineers of AIME. Publ by Soc of Mining Engineers of AIME, SME Annual Meeting, Salt Lake City, UT, USA, 2/26/90.
Hiskey JB, Qi PH. Leaching and electrochemical behavior of gold in iodine solutions part I. Dissolution kinetics. In Preprint - Society of Mining Engineers of AIME. Publ by Soc of Mining Engineers of AIME. 1990
Hiskey, J Brent ; Qi, P. H. / Leaching and electrochemical behavior of gold in iodine solutions part I. Dissolution kinetics. Preprint - Society of Mining Engineers of AIME. Publ by Soc of Mining Engineers of AIME, 1990.
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