ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 7, pp. 1372−1376. © Pleiades Publishing, Ltd., 2016.
Original Russian Text © L.A. Voropanova, N.B. Kokoeva,
2016, published in Zhurnal Prikladnoi Khimii, 2016, Vol. 89, No. 8, pp. 1077−1082.
Use of Portionwise Extractant Feeding for the Extraction
of Metal Ions from Aqueous Solutions with Tributyl Phosphate
L. A. Voropanova* and N. B. Kokoeva
North Caucasus Mining and Metallurgical Institute (State University of Technology),
ul. Nikolaeva 44, Vladikavkaz, North Ossetia, 362021 Russia
Received August 7, 2016
Abstract—A procedure involving portionwise extractant feeding was suggested for improving the characteristics
of selective extraction of metal ions from aqueous solutions. This procedure enhances the extraction of metal ions
into the organic phase, reduces the extractant consumption, and increases the distribution ratio of metals between
the organic and aqueous phases and the metal separation factor in extraction.
Methods for extraction of ions from solutions are well
known [1, 2]. It is interesting to ﬁ nd additional ways for
the extraction of metal ions from aqueous solutions.
The study was aimed at improving the characteristics
of the metal ions extraction from aqueous solutions with
tributyl phosphate (TBP).
To this end, we fed the extractant in portions. The
following parameters characterize each extraction
steps shown in Scheme 1, where m
is the initial weight
of the metal being extracted; V
, volumes of the
rafﬁ nate and extract, respectively; m
, …, m
weight of the metal in the aqueous phase after the ﬁ rst,
second, …, nth extraction steps.
The residual weight of the extractable substance in
the case of extraction with the whole volume of the
extractant in one step was calculated as follows: