Saint-Petersburg Mining University, Saint Petersburg, Russia:

G. V. Petrov, Professor, Doctor of Technical Sciences
A. Ya. Boduen, Associate Professor, Candidate of Technical Sciences
S. B. Fokina, Associate Professor, Candidate of Technical Sciences, e-mail: fokina_sb@mail.ru
I. E. Zotova, Postgraduate Student

Sorption on synthetic and organic ion-exchange materials provides one of the most advanced hydrometallurgical techniques for the extraction and concentration of platinum group metals from process solutions. A study has been conducted that looked at the sorption concentration of iridium and ruthenium from sulphuric acid solutions with various concentrations of sulphuric acid and using the resins AV-17, EDE-1OP and KU-2 for iridium and the resins EDE-1OP, KU-2 and the activated carbon KAD for ruthenium. It was found that the best iridium recovery performance is achieved when high-base anionites are used for solution treatment. The maximum recovery of iridium from the solution reached 98.2% when the sorbent AV-17 was used and the sulphuric acid concentration was 150 g/l. It was established that when the sulphuric acid concentration varies from 30 to 250 g/l, the complex iridium anion changes its charge from 2– to 8–, which is indicative of various forms of iridium complexes being formed. It was found that, for all the tested sorbents, the minimum sorption of ruthenium is associated with sulphuric acid concentration of 50 g/l, whereas the maximum sorption takes place within the sulphuric acid concentration range of 80–100 g/l. The sorbent EDE-10P was found to be most efficient for ruthenium, with the recovery of ruthenium not exceeding 18%. It is demonstrated that pre-treatment of solutions with sodium sulphate helps increase the sorption of ruthenium on the anionite EDE-10P by approximately four times. When using proven sorbents for sequential sorption from “reduced” solutions, almost all the ruthenium can be recovered. A changed sequence of the sorbent introduction does not affect the recovery of ruthenium by any of the sorbents.

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