Quality Increase in the Gold-Containing Cathode Sediment

Abstract:

The cathode sediments (CS), obtained as a result of industrial processing of gold-polymetallic raw material with complex chemical and mineral composition, contain a significant amount of impurity metals (copper, lead, zinc, iron, etc.), which leads to a significant increase in the cost of subsequent refining of these materials. The authors carried out experimental work on preliminary acid treatment of CS for the purpose of leaching impurities and increasing the share of precious metals in them. The objects of research were cathodic sediments (bypass solutions of the enterprise) containing copper and lead in the amount,% wt., respectively: 21.29 and 4.11. We tested nitric acid as a solvent in laboratory tests. For the selection of optimal leaching parameters, studies were carried out at various concentrations of the agent (from 50 to 350 kg/m3) and the ratio of L:S - (3-7):1. The duration of the experiments was 2 h, the experiments were carried out with vigorous stirring and standard ambient temperature (25°C). The experimental data processing was carried out with the help of STATISTICA 6.0 software; As factors of variation, we chose: concentration of acid, ratio of liquid and solid phases. It has been determined that nitric acid provides effective purification of CS from impurities. After the chemical enrichment, the content of precious metals in leaching cakes increased, the CS became compliant with the requirements of TU 117-2-3-78. When processing cathode sediments with nitric acid, 99% of silver passes into solution, which then allows it to be recovered from solutions by cementation and, consequently, to obtain alloys of gold and silver separately.

• Periodical: Materials Science Forum (Volume 946)
• Pages: 575-579
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.946.575
• Online since: February 2019
• Authors: Viktoria V. Zhmurova*, Nina V. Nemchinova, Andrey A. Vasilyev
• Keywords: Alloy of Ligature Gold, Cathodic Sediments, Impurities, Leaching, Nitric Acid, Precious Metals

References

[1] S.V. Balikov, V.Е. Dementev, Gold Concentrates Melting, Irkutsk: Irgiredmet, (2002).

[2] B.V. Kolmogortsev, А.А. Varenichev, Technology for treatment of lean and refractory gold ores using dead roasting, Mining Information and Analytics Bulletin. 2 (2016) 204-218.

[3] Ya.М. Shneerson, М.Т. Zhunusov, L.V. Chugaev, А.V. Markelov, S.V. Drozdov, Complex technology for gold concentrates processing: BIOX and autoclave full oxidation, Nonferrous metals and minerals – 2012: Publications of the IV International Congress (Krasnoyarsk, 5-7 September of 2012). Krasnoyarsk, (2012) 576–583.

[4] V.V. Zhmurova, Developing a way of production of noble metal alloy with minimum residual element content, Nonferrous metals – 2010: Abstracts of II International Congress (Krasnoyarsk, 2-4 September of 2010). Krasnoyarsk, (2010) 325-332.

[5] Е.I. Ivanov, V.K. Sovmen, A way of extracting gold from refractory gold ores, Russian Patent no. 2275437.

[6] Information on: https://science.education.ru/ru/article/view=15619.

[7] V.S. Chekushin, Н.В. Oleynikova, Т.Т. Artykov, М.V. Chekushin, Modernising the refractory gold concentrates processing, Nonferrous metals and minerals – 2014: Publications of the V International Congress (Krasnoyarsk, 15-18 September of 2014). Krasnoyarsk, (2014) 741-746.

[8] E.A. Agorhom, W. Skinner, M. Zanin, Influence of gold mineralogy on its flotation recovery in a porphyry copper-gold ore, Chemical Engineering Science. 99(9) (2013) 127-138.

DOI: 10.1016/j.ces.2013.05.037

[9] L. Canda, T. Heput, E. Ardelean, Methods for recovering precious metals from industrial waste, IOP Conference Series: Materials Science and Engineering. 106(1) (2016) 12-20.

DOI: 10.1088/1757-899x/106/1/012020

[10] A.M. Hussin, Ahmed, Ayman A. El-Midany, Statistical optimization of gold recovery from difficult leachable sulphide minerals using bacteria, Materials Testing. 54(5) (2012) 351-357.

DOI: 10.3139/120.110339

[11] J.H. Kyle, P.L. Breuer, K.G. Bunney, R. Pleysier, Review of trace toxic elements (Pb, Cd, Hg, As, Sb, Bi, Se, Te) and their deportment in gold processing: Part II: Deportment in gold ore processing by cyanidation, Hydrometallurgy. 111-112 (2012) 10-21.

DOI: 10.1016/j.hydromet.2011.09.005

[12] S. Mohammadnejad, J.L. Provis, S.J. Van Deventez, The effect of grinding on the preg-robbing of gold quartz, International Journal of Mineral Processing. 128 (2014) 1-5.

DOI: 10.1016/j.minpro.2014.02.002

[13] S. Syed, Recovery of gold from secondary sources – A review, Hydrometallurgy. 115-116 (2012) 30-51.

DOI: 10.1016/j.hydromet.2011.12.012

[14] J. Tremolada, R. Dzioba, A. Bernardo-Sanchez, J.M. Menendez-Agnado, The preg-robbing of gold and silver by clays during cyanidation under agitation and heap leaching conditions, International Journal of Mineral Processing. 94 (2010) 67-71.

DOI: 10.1016/j.minpro.2009.12.001

[15] V.V. Zhmurova, А.I. Karpukhin, Research into the refinement of cathode deposits, resulting from gold-bearing polymetallic stock processing, Nonferrous metals. 9 (2012) 37-40.

[16] Е.I. Korotkova, Planning and organizing an experiment: textbook, Tomsk: Tomsk Polytechnic University Publishing House, (2010).

[17] Yu.P. Adler, Е.V. Markova, Yu.А. Granovsky, Planning an experiment searching for optimum conditions, Мoscow: Nauka, (1971).

[18] V.V. Zhmurova, N.V. Nemchinova, G.G. Mineev, Acid leaching of gold-bearing cathode deposit residual elements, Nonferrous metals. 7 (2017) 41-46.

[19] А.I. Karpukhin, Acid-and-salt gold and seilver refining: monograph, Irkutsk: Irgiredmet, (2003).

[20] G.G. Mineev, А.F. Panchenko, Gold and silver dissolving agents in hydrometallurgy, Мoscow: Metallurgiya, (1994).