Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 10, pp. 1560−1566.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © A.M. Mel’nikov, O.N. Kononova, T.A. Ozerova, A.S. Luk’yanenko, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85,
No. 10, pp. 1625−1632.
TECHNOLOGY OF ELECTROCHEMICAL
AND OTHER INDUSTRIES
Sorption Recovery of Platinum(II, IV) from Chloride
and Sulfate-Chloride Solutions
A. M. Mel’nikov, O. N. Kononova, T. A. Ozerova, and A. S. Luk’yanenko
Siberian Federal University, Krasnoyarsk, Russia
e-mail: ﬁ email@example.com
Received December 26, 2011
Abstract—Sorption of platinum(II, IV) from chloride and sulfate-chloride solution on anion exchangers of varied
chemical structure (various functional groups and varied basicity) was studied. It was found that sulfate-chloride
systems have high efﬁ ciency comparable with that of chloride systems in sorption of platinum by AM-2B, Purolite
S 985, and Lewatit MP 600 WS anion exchangers.
Platinum group metals are widely used in various
industries owing to their unique properties and, therefore,
the demand for these metals steadily grows. This leads
to depletion of rich natural resources of platinum metals
and makes necessary their recovery from secondary
sources and, in particular, from worked-out catalysts
and electronic scrap . Noble metals and, in particular,
platinum are recovered from secondary raw materials
by various methods: extraction, precipitation, sorption
on carbonic and other sorbents [1–6]. Particularly great
importance is assumed by the sorption concentration
on ion exchangers, which is characterized by high
efﬁ ciency, selectivity, ecological safety, and convenient
combination with the methods subsequently used to
determine platinum metals [1, 7].
Commonly, materials containing platinum group
metals are decomposed and the metals are transferred
into solution by means of aqua regia or by using
chlorination, ﬁ re assay, and other methods [1, 4]. As a
result, noble metals are present in solution in the form of
complex compounds with varied stability and chemical
inertness. In addition, platinum metal complexes are
subject to the effect of aquation and hydrolysis [1,
8–10]. Sorption of metals from solutions of this kind
is hindered and numerous valuable components may
be lost. That is why a high selectivity of sorbents is
important. In this context, it is necessary to study the
sorption concentration of platinum metals from model
solutions, which could make it possible to ﬁ nd conditions
for raising the degree of their recovery, dependent on
a number of factors, i.e., the solution acidity, nature
and concentration of components, and composition of
complexes [1, 8, 10].
Chloride and hydrochloric acid solution of noble
metals are the best studied at present [1, 8, 10–12].
However, sulfate solutions of platinum metals are also
of interest [1, 8, 13, 14]. In these media, platinum exists
in the form of sulfate complexes having a substantial
kinetic inertia as compared with the corresponding
chloride complexes [1, 8]. These sulfate complexes
are poorly sorbed, and, therefore, sulfate solutions of
platinum metals are commonly activated by addition
of sodium chloride or autoclave chlorination [13–15].
Addition of hydrochloric acid to sulfate solutions
leads to activation of these systems without additional
expenditure. It has been shown that there are no sulfate
complexes of platinum metals in the systems obtained
. At the same time, in the opinion of the authors of
, sulfate-chloride solutions of platinum must be no
less efﬁ cient in its recovery from secondary sources.
Our study is concerned with the sorption
concentration of platinum from sulfate-chloride
solutions in comparison with chloride solutions.