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NOBLE METALS AND ALLOYS
ArticleName Hydrocarbonyl technology of processing of poor middlings with obtaining of rich selective concentrates of platinum metals
ArticleAuthor Fedoseev I. V., Barkan M. Sh.
ArticleAuthorData

Kaluga branch of Bauman Moscow State Technical University, Kaluga, Russia:

I. V. Fedoseev, Professor of a Chair of Chemistry, e-mail: prof.Igor.Fedoseev@gmail.com

 

National Mineral Resources University (University of Mines), Saint Petersburg, Russia:
M. Sh. Barkan, Assistant Professor of a Chair of Geoecology

Abstract

Modernization of metallurgical processes of MMC Norilsk Nickel is aimed at formation of new technogenic products, containing platinum metals (in particular – insoluble residual products of leaching of Bessemer matte, nickel concentrate, etc). These products are primary poor bulk concentrates of platinum metals. The paper describes quite new technology of processing of poor bulk concentrates of platinum metals into rich selective concentrates of platinum metals PK-1 (platinum-palladium) and PK-2 (concentrates of rare platinum metals, such as Rh, Ru and Ir). For this purpose, poor bulk concentrates of platinum metals are subjected to flotation with their following dissolving by hydrochlorination. The obtained solution is treated by gas, containing CO (producer gas) at the temperature of 20–60 оC and atmospheric pressure (hydrocarbonyl process). As a result, there is formed a precipitation of sum of Pt, Pd, Au, Ag, Se and Te (equal to PK-1). After removing of Se and Te by pyro- and hydrometallurgical methods, there is obtained the concentrate with sum of Pt, Pd (98%) and sum of Cu, Ni, Fe (<0,25%). The precipitate, containing all residual precious metals in solution, is obtained from filtrate because of isolation (extraction) of PK-1 under the influence of precipitating agents. This precipitate is converted into PK-2 concentrate, which contains 30–35% of sum of Rh, Ru and Ir; 5–7% of sum of Pt and Pd; 45–50% of Ag; and 7–10% of sum of Cu, Ni and Fe. As a result, almost complete recovery of precious metals into PK-1 and PK-2 selective concentrates is reached, which meets the requirements of the refining process at Krasnoyarsk plant.

keywords Poor concentrates, platinum metals, flotation, hydrocarbonyl process, rich concentrates, selective concentrates, sedimentation
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