Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials – a subdivision of the Federal Research Centre Kola Science Centre at the Russian Academy of Sciences, Apatity, Russia

N. S. Areshina, Senior Researcher, Candidate of Technical Science, e-mail: n.areshina@ksc.ru
A. G. Kasikov, Head of the Laboratory for the Development and Implementation of Chemical Processes, Candidate of Chemical Science
S. V. Drogobuzhskaya, Senior Researcher, Candidate of Chemical Science

The process of electrorefining, which is a part of the secondary copper technology, generates slurries, the composition of which differs significantly from that of the slurries generated as a result of ore processing. The analysis revealed a high concentration of tin and the presence of noble metals in the former, with only an insignificant concentration of selenium and tellurium. Besides, the considered slurry contains a great amount of barium, which is due to the use of barium-containing materials in the production of copper anodes. In the section dealing with a fraction rich in valuable components, 40% of product was separated which contained 10.7 wt % of tin and about 0.3 wt. % of noble metals. The product was subjected to hydrochemical processing aimed at recovering copper and lead. This resulted in the production of primary concentrate containing, wt. %: 23.9 Ba, 19.8 Sn, 8.4 Ag; 0,0085 Au, 0,0012 Pt, 0,0050 Pd, 0,0010 Rh, 0,0003 Ru, 0,0003 Ir Two options are proposed for processing the primary concentrate in order to separate barium from the other valuable components. The first option implies recovering tin and noble metals in solution by hydrochloric acid leaching in the presence of an oxidizer, while barium sulphate is concentrated in the residue. The valuable components were recovered from the solution by zinc cementation, which resulted in the production of collective concentrate containing tin, silver, and noble metals. The other option implies liberation and separation of the barium-containing phase by sulphatisation and concentration of tin in the deposit. Silver and the most of noble metals transition in the solution and then get extracted in collective concentrate by precipitation.

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