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 language | English (US) |
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Pages | 8p 112 |
State | Published - 1990 |
Event | SME Annual Meeting - Salt Lake City, UT, USA Duration: Feb 26 1990 → Mar 1 1990 |
Other
Other | SME Annual Meeting |
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City | Salt Lake City, UT, USA |
Period | 2/26/90 → 3/1/90 |
ASJC Scopus subject areas
- General Engineering