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NOBLE METALS AND ALLOYS
ArticleName Indicators of rhodium powder electrochlorination technology
DOI 10.17580/tsm.2016.09.08
ArticleAuthor Voinov V. N., Konik K. P., Kuzas E. A., Lobko S. V.
ArticleAuthorData

Ekaterinburg Non-Ferrous Metals Processing Plant, Verkhnyaya Pyshma, Russia:

V. N. Voinov, Leading Research Engineer
K. P. Konik, Head of Refinery Shop
S. V. Lobko, Leading Research Engineer

“EZOCM-ENGINEERING” LLC, Verkhnyaya Pyshma, Russia:

E. A. Kuzas, Engineer, e-mail: e.kuzas@ezocm.ru

Abstract

Specialists from Ekaterinburg Non-Ferrous Metals Processing Plant developed and introduced the efficient technology of obtaining of rhodium hydrochloric acid, which provides the electrochlorination of rhodium powder in HCl solution. Laboratory investigations defined the most suitable process parameters, including type, frequency and density of current. Industrial realization of the process developed the electrochemical cell, working in completely automated electrolysis complex, used for atomic chlorine generation with application of symmetrical alternating low-frequency current and chlorination of rhodium powder. This technology has the following advantages: simplicity; high automation grade; high production capacity (not less than 200 kg of rhodium per year); low operational and labor costs; high efficiency (yield is not less than 99.6%); minimal ecological risks (chlorine, generated in electrolysis complex, requiring no storage); high quality of finished output (content of any impurity (Pt, Pd, Ir, Fe, Ni, Cu) is not more than 5.10–3%); solution of rhodium acid, suitable for obtaining of other rhodium compounds (chloride, nitrate, sulfate, phosphate, iodide) using classical approaches of hydrometallurgy. This technology can be used by automobile catalysts and jewelry production enterprises, which have no own raw material base, but want their own precursor production for obtaining of autocatalytic compositions and rhodium plating electrolytes from rhodium powder.

keywords Powder, rhodium, electrochlorination, volumetric anode, hydrochloric acid, atomic chlorine, passivation, metallization, electrochemical cell, electrolysis complex
References

1. Mirovoy i rossiyskiy rynok metallov platinovoy gruppy 2015: kontsentraty, platina, palladiy, rodiy, iridiy, ruteniy, osmiy : analiticheskiy obzor (Global and Russian platinum group metal market 2015: concentrates, platinum, palladium, rhodium, iridium, ruthenium, osmium : analytical review). Ekaterinburg : MetalResearch, 2015. 150 p. Available at: http://www.metalresearch.ru/world_rus_PGM_market_2015.html (accessed: April 20, 2016) (in Russian)
2. Konik K. P. et al. Sposob polucheniya rastvora nitrata rodiya (Method of obtaining of rhodium nitrate solution). Patent RF, No. 2265579, IPC7 C 01 G 55/00. Applier and patent-holder: JSC Ekaterinburg Non-Ferrous Metals Processing Plant. Applied: 27.05.04. Published: 10.12.05. Bulletin No. 34.
3. Buslaeva T. M. et al. Sposob polucheniya rastvora nitrata rodiya (Method of obtaining of rhodium nitrate solution). Patent RF, No. 2208586, IPC7 C 01 G 55/00. Applier and patent-holder: Moscow State University of Fine Chemical Technologies named after M.V. Lomonosov. Applied: 19.12.00. Published: 20.07.03.
4. Prikladnaya elektrokhimiya : uchebnik dlya vuzov (Applied electrochemistry : tutorial for universities). Under the editorship of A. P. Tomilov. Moscow : Khimiya, 1984. 520 p.
5. Llopis J., Tordesillas I. M., Muniz M. Anodic corrosion of rhodium in hydrochloric acid solutions. Electrochimica Acta. 1965. Vol. 10, No. 11. pp. 1045–1055.
6. Byeong-Chul Yu, Soo-Kyung Kim, Jeong-Soo Sohn, Hun-Joon Sohn. Electrochemical behaviour and electrowinning of rhodium in acidic chloride solution. Journal of Applied Electrochemistry. 2014. Vol. 44, No. 6. pp. 741–745.
7. Schulz E. N., Salinas D. R., Garcia S. G. Electrodeposition of rhodium onto a pre-treated glassy carbon surface. Electrochemistry Communications. 2010. Vol. 12, No. 4. pp. 583–586.
8. Llopis J., Vazquez M. Passivation of rhodium in hydrochloric acid solutions. Electrochimica Acta. 1964. Vol. 9, No. 12. pp. 1655–1663.
9. Elektroosazhdenie blagorodnykh i redkikh metallov (Electro sedemintation of noble and rare metals). Under the editorship of L. I. Kadaner. Kiev : Tekhnika, 1974. 160 p.
10. Yampolskiy A. M. Elektroliticheskoe osazhdenie blagorodnykh i redkikh metallov (Elecrolytic sedimentation of noble and rare metals). Leningrad : Mashinostroenie, 1977. 96 p.
11. GOST 12342–81. Rodiy v poroshke. Tekhnicheskie usloviya (State Standard 12342–81. Rhodium in powder. Specifications). Introduced: January 01, 1983. (in Russian)
12. Baraboshkin V. E. et al. Effektivnaya tekhnologiya polucheniya khlorida rodiya (Efficient technology of obtaining of rhodium chloride). XX Mezhdunarodnaya Chernyaevskaya konferentsiya po khimii, analitike i tekhnologii platinovykh metallov : sbornik tezisov (XX International Chernyaev conference on chemistry, analytics and technology of platinum metals : collection of thesises). Krasnoyarsk : Siberian Federal University, 2013. p. 132.
13. Medvedev S. et al. An electrochemical method and a technological solution to rhodium chloride production. IPMI® 39th Annual Conference : Proceedings. Madison : Omnipress, 2015. 1 CD-ROM.

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