Abstract
The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia. These chemicals represent health and safety risks for workers and a serious threat for the environment. However, even if several other reagents are known to dissolve gold at the laboratory scale, none of these are used industrially. Hot mixtures of hydrochloric acid with strong oxidizing compounds are known to generate in-situ nascent chlorine which is capable of dissolving gold efficiently. In this study, the authors investigated the capability of a hot mixture of hydrochloric acid and ground manganese (IV) oxide to dissolve gold metal either under atmospheric or pressurized conditions. The best result was obtained under a pressure of 639 kPa at 90°C with a dissolution rate of 0.250 g·cm−2h−1 and it was compared to that reported in the literature for other industrial reagents.
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References
E.B. Amey, “Gold,” USGS Mineral Yearbook 2004 (Washington, D.C., USGS, 2004), pp. 34.1–34.9.
Anonymous, “Gold,” Mining Journal, (June 11, 2004), pp. 19–24.
F. Cardarelli, Materials Handbook. A Concise Desktop Reference (New York: Springer, 2001), pp. 196–203.
N.N. Greenwood and A. Earnshaw, Chemistry of the Elements, 2nd. ed. (New York: Pergamon Press, 1997). p. 1175.
H. Renner, “Gold,” Handbook of Extractive Metallurgy, Vol. III, ed. F. Habashi (Weinheim, Germany: Wiley-VCH, 1997), pp. 1183–1213.
P. Pascal, Nouveau Traité de Chimie Minérale. Tome III—Groupe la: Rubidium, cesium, francium; Groupe lb: Généralités, cuivre, argent, or. (Paris: Masson & Cie, 1957).
N. Gönen, “Leaching of Finely Disseminated Gold Ore with Cyanide and Thiourea Solutions,” Hydrometallurgy, 69 (2003), pp. 169–176.
J.W. Mellor, A Comprehensive Treatise of Inorganic and Theoretical Chemistry (London: Longmans Green & Co., 1923), p. 499.
F. Habashi, Principles of Extractive Metallurgy, Vol. 2, 2nd ed. (New York: Gordon and Breach, 1980), p. 39.
N.V. Svistunov, “Mechanism for the Dissolution of Gold in Chlorine Water,” Tsvetnaya Metallurgiya, 13 (5) (1970), pp. 69–71.
C.C. Nesbitt, J.L. Hendrix, and J.H. Nelson, “The Effect of Nascent Chlorine and Multivalent Chloride Salts in the Dissolution of Gold by Chlorine,” EPD Congress 1992, ed. J.P. Hager (Warrendale, PA: TMS, 1992), pp. 313–326.
A.D. Brokaw, “The Solution of Gold in the Surface of Alterations of Ore Bodies, J. Geology, 18 (1910), p. 322.
P. Chattopadhyay and M. Mistry, “Novel Dissolution Procedure Using a Mixture of Manganese Dioxide and Hydrochloric Acid for the Matrix-Independent Determination of Gold,” Fresenius J. Anal. Chem., 357 (1997), pp. 308–313.
A.I. Vogel, A Textbook of Inorganic Quantitative Inorganic Analysis, 3rd ed. (London: Longman, 1961), p. 1091, paragraph XXI. 13.
R.H. Perry and D.W. Green, Perry’s Chemical Engineers’ Handbook, 7th ed. (New York: McGraw-Hill, 1997), pp. 2–76.
R.W. Stanley, G.B. Harris, and S. Monette, “Process for the Recovery of Gold from a Precious Metal Bearing Sludge Concentrate, U.S. patent 4,670,052 (2 June 1987).
R.K. Lea, J.D. Edwards, and D.F. Colton, “Process for the Extraction of Precious Metals from Concentrates Thereof,” U.S. patnet 4,397,689 (9 August 1983).
J. Vinals, C. Nunez, and O. Herreros, “Kinetics of the Aqueous Chlorination of Gold in Suspended Particles,” Hydrometallurgy, 38 (1995), pp. 125–147.
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For more information, contact Nicolas Geoffroy, McGill University, 3610 University Street, Montreal, (QC) PQ H3A 2B2, Canada; e-mail nicolas.geoffroy@mail.mcgill.ca.
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Geoffroy, N., Cardarelli, F. A method for leaching or dissolving gold from ores or precious metal scrap. JOM 57, 47–50 (2005). https://doi.org/10.1007/s11837-005-0168-0
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DOI: https://doi.org/10.1007/s11837-005-0168-0