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NOBLE METALS AND ALLOYS
ArticleName Smelting of alluvial gold with rare platinum metals group grade
ArticleAuthor Rybkin S. G., Nikolaev Yu. L., Larionov I. Yu.
ArticleAuthorData

Laboratory No. 7, OJSC IRGIREDMET

S. G. Rybkin, Senior Researcher, e-mail: nik@irgiredmet.ru
Yu. L. Nikolaev, Senior Researcher

 

“Gidravlika” Ltd

I. Yu. Larionov, General Director

Abstract

Recently pyrometallurgical docks for gold bearing concentrates treatment with gold bullion production have been established at many gold operations of Russia. This measures embodiment is quite effective because one being it possible to accurate measurements and processing operations between gold suppliers and affinity plants. In Irgiredmet OJSC scientific research and engineering works on innovative technology for high grade gold bearing concentrates with vide variable composition pyrometallurgical treatment designing and suitable technology and equipment modernization being fulfilled. A sweating-segregate melting technology of alluvial gold with rare platinum-group metals (osmium, iridium and ruthenium) grade was developed. The physical chemistry of this technology is based on a mutual limited solubility of solid and liquid gold and iron monosulphide as well as extractive ability of liquid iron monosulphide for platinum-group metals. Gold bullion, matte and slag are condensed products of the alluvial gold melting with fluxes and additives at the temperature of 1200 oC. The platinum-group metals concentrate selectively into the matte, which is a saleable concentrate of platinum-group metals. A successful pilot-plant testing of this technology has been carried out. Sweating-segregate melting of alluvial gold with rare platinum-group metals grade technology pilotplant testing shows that the technology allowing segregate gold and platinum-group metals, e.g. to produce gold bullion and platinumgroup metal concentrate. Gold bullions had been produced contained 94.32–94.99% gold and 4.09–5.09% silver. Matte, according analyses had been complete in Irgiredmet OJSC and Krastscvetmet OJSC, contained (mass %): 0.56 platinum, 0.11 rhodium, 3.46 iridium, 3.50 ruthenium, 4.92 osmium, 9.98 gold, 2,43 silver, 37.60 iron, 4.75 lead, 27.14 sulfur, 4.33 sodium. The technology incorporation into industrial scale provides accurate processing operations between gold suppliers and affinity plants for gold bullions and additional profit in favor of platinum-group metals supply.

keywords Charge gold, platinum-group metals, attendant metals, restricted solubility, melts, iron monosulphide
References

1. Patent 2094505 RF MPK6 S22V 11/02. Shikhta dlya polucheniya zoloto-serebryanogo splava (The charge for the gold-silver alloy manufacturing). Rybkin S. G., Karpukhin A. I. ; Published 27.10.1997.
2. Patent 2215802 RF MPK7 S22V 11/02. Sposob pererabotki kontsentratov, soderzhashchikh blagorodnye metally (Method of reprocessing of the concentrates containing precious metals). Rybkin S. G. ; Published : 10.11.2003.
3. Nikolaev Yu. L., Rybkin S. G. Perspektivy razvitiya zolotodobychi v Zabaykale : Materialy mezhregionalnoy nauchno-prakticheskoy konferentsii. Chita, 25–27 iyunya 2003 g. (Prospects of the gold-mining in the Transbaikal region : Materials of the International Scientific and Practical Conference. Chita, June 25–27, 2003). Chita, 2003. pp. 69–72.
4. Nikolaev Yu. L., Rybkin S. G. Progressivnye metody obogashcheniya i tekhnologii glubokoy pererabotki rud tsvetnykh, redkikh i platinovykh metallov (Plaksinskie chteniya) : Materialy Mezhdunar. Sov. 02–08 oktyabrya 2006 (Progressive methods of beneficiation and technology of advanced processing of non-ferrous, rare and platinum metals ores (Plaksin Reading) : Materials of the International Session. October 2–8, 2006). Krasnoyarsk, 2006. pp. 251–253.
5. Rybkin S. G., Nikolaev Yu. L., Barankevich V. G. Izv. RAN. Zhurnal neorganicheskoy khimii — Proceedings of Russian Academy of Sciences. Journal of Inorganic Chemistry. 2006. Vol. 51, No. 3. pp. 518–521.
6. Nikolaev Yu. L., Ribkin S. G. XXV International Mineral Processing Congress — IMPC 2010 «Smarter Processing for the Future» Brisbane, Australia 6-10 September 2010. Congress Proc. pp. 1579–1584.

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