Chair of Inorganic Chemistry, Omsk State University, Omsk, Russia:

L. N. Adeeva, Professor, e-mail: L.n.adeeva@gmail.com
A. V. Mironov, Post-Graduate Student
V. F. Borbat, Professor, Head of a Chair

High cost of chelating resins, applied for selective extraction of platinum metals from technogenic wastes and processed solutions, raises their regeneration task. Previously, there were carried out the comprehensive studies for the platinum (IV) sorption on the Purolite S920 resin, containing thiourea functional groups. This resin has a high exchange capacity and adsorption selectivity, according to Pt (IV). This article defines the regularities of platinum (IV) desorption with the chelating resin Purolite S920, using thiourea as chemical and electrochemical methods. During the chemical desorption of thiourea by muriatic solution, the maximum degree of desorption of platinum (IV) was more than (67±3)%. Desorption with imposing of electric current was carried out for increasing of extent of extraction of platinum from ionite. Electrochemical desorption was carried out in electrolytic cell with direct current for the purpose of simultaneous cathodic allocation of platinum, which was passed to solution from anion exchanger. It is shown that degree of platinum desorption from resin with thiourea solution is increased from (64±2)% to (94±3)%, when direct current is applied. Thus, the basic amount of platinum is allocated on the cathode (87±2)%. The possibility of reuse of regenerated chelating resin for platinum (IV) extraction of solution is shown. High values of regeneration parameters also remain at repeated carrying out of process. The offered method allows to carry out the efficient extraction of platinum on cathode in one stage with desorption.

1. Adeeva L. N., Borbat V. F., Mironov A. V., Shindler A. A. Sorbtsiya platiny (IV) i palladiya (II) na khelatnoy smole firmy Purolite S920 (Sorption of platinum (IV) and palladium (II) on chelating resin Purolite S920). 25 let Institutu khimii i khimicheskoy tekhnologii Sibirskogo otdeleniya Rossiyskoy akademii nauk: itogi i perspektivy : sbornik nauchnykh trudov (25 years of Institute of Chemistry and Chemical Technology of Siberian Branch of Russian Academy of Sciences: resumes and prospects : collection of scientific proceedings). Krasnoyarsk : Publishing House of Institute of Chemistry and Chemical Technology of Siberian Branch of Russian Academy of Sciences, 2006. pp. 229–234.
2. Melnikov A. M., Kononova O. N., Pavlenko N. I., Krylov A. S. Zhurnal fizicheskoy khimii — Russian Journal of Physical Chemistry. 2012. Vol. 86, No. 6. pp. 1129–1135.
3. Blokhin A. A., Abovskiy N. D., Murashkin Yu. V., Bueva I. S., Drozdov D. V. Sorbtsionnye i khromatograficheskie protsessy — Sorption and chromatographic processes. 2005. Vol. 5, No. 3. pp. 418–424.
4. Bondareva V. V., Troshkina I. D., Bryksin D. A., Voloshchenko A. S., Chirkov A. S. Sorbtsionnye i khromatograficheskie protsessy — Sorption and chromatographic processes. 2006. Vol. 6, No. 6. pp. 977–980.
5. Khmelnitskaya O. D., Panchenko A. F., Chernov V. K. Sposob izvlecheniya blagorodnykh metallov s ionoobmennykh smol, soderzhashchikh zoloto, serebro i platinovye metally (Method of extraction of noble metals from ion-exchange resins, containing gold, silver and platinum metals). Patent RF, No. 2087565, MPK⁶ C 22 B 11/00. Applicant and patent holder : “Irgiredmet” JSC. No. 95106736/02. Applied : April 26, 1995. Published: August 20, 1997.
6. Lebed A. B., Krayukhin S. A., Naboychenko S. S., Maltsev G. I. Izvestiya vuzov. Tsvetnaya metallurgiya — Russian journal of nonferrous metals. 2012. No. 3. pp. 17–20.
7. Igumnov M. S., Karmannikov V. P., Yurasova O. V. Tsvetnye Metally — Non-ferrous metals. 2001. No. 4. pp. 46–49.
8. Ginzburg S. I. Analiticheskaya khimiya platinovykh metallov (Analytical chemistry of platinum metals). Moscow : Nauka, 1972. 616 p.
9. Borbat V. F., Adeeva L. N., Korneeva I. N. Sposob sovmestnogo izvlecheniya platiny i reniya iz otrabotannykh platinorenievykh katalizatorov (Method of joint extraction of platinum and rhenium from processed platinum-rhenium catalizers). Patent RF, No. 2167213, MPK⁷ C 22 B 11/00, C 22 B 61/00, C 22 B 3/06, C 22 B 7/00. Applicant and patent holder : Omsk State University. No. 99124472/02. Applied : November 22, 1999. Published : May 20, 2001.