ISSN 1070-4272, Russian Journal of Applied Chemistry, 2015, Vol. 88, No. 11, pp. 1763−1769. © Pleiades Publishing, Ltd., 2015.
Original Russian Text © O.N. Kononova, A.I. Zemlyanskaya, E.V. Duba, 2015, published in Zhurnal Prikladnoi Khimii, 2015, Vol. 88, No. 11, pp. 1547−1554.
INORGANIC SYNTHESIS AND INDUSTRIAL
Ion-Exchange Recovery of Nickel(II) and Cobalt(II)
from Sulfuric Acid Solutions
O. N. Kononova, A. I. Zemlyanskaya, and E. V. Duba
Siberian Federal University, pr. Svobodny 79/10, Krasnoyarsk, 660041 Russia
Received October 23, 2015
Abstract—Sorption recovery of nickel(II) and cobalt(II) in their joint presence in sulfuric acid solutions was
studied on new samples of domestic ion exchangers of CYBBER brand. It was shown that the ion exchangers
under study have a high sorption capacity for ions of both nonferrous metals, depending on the structure of a
sorbent and on the acidity of a contacting solution. It was found that, after Co(II) and Ni(II) ions are extracted
from weak or strong sulfuric acid solutions, they can be effectively eluted from the ion exchangers under study
with a 2 M hydrochloric acid solution to an extent of 85–95% (nickel) and 87–95% (cobalt).
At present, an increase in the consumption of non-
ferrous metals is observed, which leads to a rise in the
amounts of their manufacture. However, the increase in
the efﬁ ciency of manufacture of the metals and com-
pounds of these, as well as the processes of their process-
ing, result in a more substantial discharge of technogenic
contamination into the environment [1, 2]. It is known that
heavy metals belong to stable toxicants with a cumulative
effect [1–3]. Therefore, both the puriﬁ cation of indus-
trial wastewater and the improvement of technological
processes used in mining, metallurgical, and chemical
industries are topical ecological problems.
In the last decades, the sorption puriﬁ cation and after-
puriﬁ cation of industrial discharges to remove heavy
metal ions have gained wide application because of the
high efﬁ ciency, selectivity, and ecological safety [1–7].
Attention is being given to use of both natural sorbents
[1, 2, 7] and synthetic ion exchangers [3–6, 8, 9]. The
former attract researchers’ attention because of their low
coast and ready availability, whereas the latter occupy
increasingly stable position owing to their high exchange
capacity, chemical stability, and possible regeneration,
which enables their multiple use.
Commonly, the main problem in recovery of nickel
and cobalt from solutions upon leaching from nickel
ores is the high acidity of these solutions because high-
concentration sulfuric acid solutions are used in ore
processing . Therefore, it is of scientiﬁ c and practical
interest to examine the sorption capacity of the ion
exchangers under various acidities of the medium and
concentrations of competing ions.
The present study is concerned with the sorption
recovery of nickel(II) and cobalt(II) ions from sulfuric
acid solutions on a number of ion exchangers of CYBBER
brand, which are new domestic sorbents. Previously,
these ion exchangers have been well proven in recovery
of platinum(II, IV) in the presence of iron(III) from
chloride solutions . The results obtained in a study
of the sorption of nonferrous metals are reported here
for the ﬁ rst time.
For the purposes of this study, we chose CYBBER ion
exchangers synthesized by Syntez NVK (Saturn Group
of companies, St. Petersburg). Their physicochemical
characteristics are listed in Table 1. As follows from these
data, we chose ion exchangers of the complexing type
, to which belong chelate sorbents and a weak basic
anion exchanger. The strong acid cation exchanger was
chosen for comparison of their sorption capacity.