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ArticleName Rare metals behavior during the processing of off-balance copper-sulfide ores
DOI 10.17580/tsm.2017.11.13
ArticleAuthor Zakharyan S. V., Troshkina I. D., Vanin I. A., Serikbay A. U.

LLP “Kazgidromed”, Karaganda, Kazakhstan:

S. V. Zakharyan, Head of Research Laboratory

A. U. Serikbay, Research Engineer of Research Laboratory


Mendeleev University of Chemical Technology of Russia, Moscow, Russia:
I. D. Troshkina, Professor of a Chair of Technology of Rare Elements and Nanomaterials on Their Basis, e-mail:
I. A. Vanin, Post-graduate Student


We studied the distribution of rare elements (radiogenic osmium and uranium) at the hydrometallurgical processing of crude concentrate obtained by flotation of off-balance copper-sulfide ores of Zhezkazgan deposit (Kazakhstan). Osmium and uranium content in the rougher concentrate ((0.90–5.61)·10–3g/t and 1.91 g/t, respectively) was determined by mass spectrometry with inductively coupled plasma. Flotation concentrate is leached by the solutions of nitric acid with the addition of sodium chloride. Firstly, rhenium is sorbed from the obtained solutions by weakly basic anion exchanger Purolite A170 with a secondary amine functional groups, then copper is sorbed by macroporous ion exchanger Lewatit MonoPlus TP 220 with chelating groups of bis-picolylamine. As a result, radiogenic osmium is accumulated in the sorbents. When rhenium is eluted by ammonia solution (8%), radiogenic osmium is also desorbed. In a second stage of rhenium sorption from the primary eluate using impregnate containing trialkylamine, it remains in solution. Marketable product of osmium can be obtained by the known methods  from chelate adsorbent Lewatit MonoPlus TP 220 after working in copper processing and from rhenium solution after sorption in the second stage. Uranium is leached from the rough concentrate and is not extracted from the productive solution on the sorption stages of rhenium and copper, which contributes to high quality end products (copper, rhenium, silver). The specific activity of natural radionuclides in the slurry is significantly lower than the value corresponding to boundary condition of waste classification as liquid radioactive wastes.

This work was carried out with the partial financing of the Ministry of Education and Science of the Russian Federation within the subsidiary agreement No. 14.580.21.0004 on 19.08.2015 (project ID RFMEFI58015X0004).

keywords Poor copper-sulphide ores, rhenium, osmium, uranium, distribution, flotation concentrate, leaching, sorption

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