JSC “Institute “Gintsvetmet”, Moscow, Russia:
E. I. Gedgagov, Head of Laboratory of Metallurgy and Dressing, e-mail: egedgagov@gmail.com

PLC “KazGidroMed”, Karaganda, Kazakhstan:
S. V. Zakharyan, Head of Research Laboratory, e-mail: szakharyan@yandex.ru
I. V. Terenteva, Geologist, e-mail: irina_ter64@mail.ru
A. U. Serikbay, Research Engineer of Research Laboratory, e-mail: shakeev1986@mail.ru

Our paper shows the results of laboratory studies and pilot tests of microporous impregnated sorbent, where extragent Cyanex 272, included into a styrenedivinylbenzene matrix, was used as an impregnator for extraction and deep purification of nickel solutions from cobalt. The impregnated sorbent with functional groups of di-(2,3,4-trimethylpenthyl) phosphinic acid provides the required extraction of cobalt from nickel solution during the single-two ion exchange sorption stage in static mode. The maximum purification of cobalt solution from nickel impurities is within рН 3-6. High values of cobalt and nickel separation factors, achieving 5000 in the process solutions, allow nickel and cobalt separation in presence of suppressor ions such as copper, zinc, iron, etc. The conditions were developed for flush displacement of impregnated cobalt-rich sorbent from nickel macrocation. The conditions are offered for nickel desorption from rich anionites with obtaining of residual capacity allowing the multiple use of sorbent charge. The hardware solutions are recommended for purification.

1. Kostanyan A. E., Erastov A. A., Belova V. V., Kholkin A. I. New extractionchromatographic processes of separation of organic and inorganic substances. Khimicheskaya tekhnologiya. 2015. Vol. 16, No. 4. pp. 239–245.
2. Gedgagov E. I. Basic principles of approach to the choice of industrial ionites for creation of ecologically safe schemes of deep separation of nickel and cobalt. Thesis of reports of international conference on chemical technology. 17–23 June 2007. Moscow : Lenand, 2007. Vol. 4. pp. 220–223.
3. Gedgagov E. I., Zakharyan S. V., Khayrullin I. I., Shilov S. L. Investigations of new sorbents of Lanxess concern (Germany) for extraction and deep purification of non-ferrous and rare metals and prospects of application for rareearth elements separation. New approaches in chemical technology of mineral raw materials. Application of extraction and sorption : materials of the 2^nd Russian conference. 3–6 June 2013. Saint Petersburg, 2013. Part II. pp. 25–27.
4. Gedgagov E. I., Myshkovskiy A. M., Ospanov N. A., Zakharyan S. V. Development of sorption processes for extraction, purification and application of rare-earth metals (REM-2011) : thesis of reports of the 10-th All-Russian scientific and practical conference. 26–27 September 2011. Moscow, 2011. pp. 45–48.
5. Murinov Yu. I. Prospects of creation of sorbents and extragents on the basis of sulfur- and nytrogen-organic compounds. New approaches in chemical technology of mineral raw materials : thesis of report of the 2nd Russian conference with international participation. 3–6 June 2013. Saint Petersburg, 2013. Part 1. pp. 32–33.
6. Zakutevskiy O. I., Psareva T. S., Strelko V. V., Zhuravlev I. Z., Khan V. E. Sorbents for accumulation and uptake of radionuclides and uranium from aqueous solutions. Khimiya, fizika i tekhnologiya poverkhnosti. 2012. Vol. 3, No. 2. pp. 199–204.
7. Voropanova L. A. Theory and practice of sorption processes of extraction of non-ferrous metals from water solutions. Vladikavkaz : NPKP “MAVR”, 2014. 360 p.
8. Romantsova I. V. Nanomodified sorbents for purification of liquid mediums : thesis of inauguration of Dissertation … of Candidate of Engineering Sciences. Tambov : FGBOU VPO “TGTU”, 2013. 16 p.
9. Coleman N. J., Brassington D. S., Raza A., Mendham A. P. Sorption of Co²⁺ and Sr²⁺ by waste-derived 11-Аtobermorite. Waste Management. 2006. Vol. 26, No. 3. pp. 260–267.
10. Wang W., Cheng C. Y. Separation and purification of scandium by solvent extraction and related technologies: a review. Journal of Chemical Technology and Biotechnology. 2011. Vol. 86, No. 10. pp. 1237–1246.
11. Xie F., Zhang T., Dresinger D., Doule F. A critical review on solvent extraction of rare earths from aqueous solutions. Minerals Engineering. 2014. Vol. 56. pp. 10–28.
12. Gupta B., Malik P., Deep A. Solvent Extraction and Separation of Tetravalent Lanthanides and Ittrium Using Cyanex 923. Solvent Extraction and Ion Exchange. 2003. Vol. 21, No. 2. pp. 239–259.
13. Maslova M. V., Gerasimova L. G. Sorption of non-ferrous metal cations on hydrated titanium dioxide. Non-ferrous Metals. 2017. No. 2. pp. 27–32.
14. Gerasimova L. G., Nikolaev A. I., Maslova M. V., Shchukina E. S. Synthesis of a titanium (IV)-based sorbent and potentialities of its usage for extracting cations of non-ferrous metals. Non-ferrous Metals. 2017. No. 2. pp. 32–36.