Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 10, pp. 1762−1766.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
D.E. Chirkst, O.V. Cheremisina, M.V. Ivanov, I.T. Zhadovskii, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 10,
OF SYSTEMS AND PROCESSES
Isotherm of Pb–Na Cation Exchange
on Iron-Manganese Concretions
D. E. Chirkst, O. V. Cheremisina, M. V. Ivanov, and I. T. Zhadovskii
St. Petersburg State Mining Institute (Technical University), St. Petersburg, Russia
Received November 26, 2008
Abstract—Isotherm of Pb
cation exchange on iron-manganese concretions was studied. The ion
exchange was described by a modiﬁ ed Langmuir equations. The limiting sorption and apparent ion-exchange
constant were calculated.
At present, the sorption and ion exchange ﬁ nd
increasingly wide use in wastewater puriﬁ cation.
This method enables effective recovery of nonferrous
metal cations from waste solutions with various salt
Prognostication of the possibility of water puriﬁ cation
is based on construction of series characterizing the
limiting sorption of cations. However, these values
depend on the degree of cation dehydration and,
consequently, are not an unambiguous characteristic
of afﬁ nity, i.e., they depend on the porosity, speciﬁ c
surface area, and mechanical properties of a sorbent.
Therefore, a topical task is to construct cation sorption
series dependent on the differential Gibbs energy
and to prognosticate on the basis of these series the
possibility of water puriﬁ cation or recovery of metal
cations on sorbents with an ion-exchange function from
technological solutions. It was shown in [2, 3] that
iron-manganese concretions(IMCs) are a promising
natural sorbent that can be used to purify natural and
artesian water used for drinking water supply, as well as
wastewater and waste technological solutions.
Deposits of iron-manganese concretions widely
occur over the bottom area of the Gulf of Finland in the
Baltic Sea, being mostly found at the bottom surface
The technology of IMC mining has been developed
at St. Petersburg Mining Institute by Dobretsov .
The possibility of utilization of spent concretions by
the pyrometallurgical method at metallurgical plants
by the technology for recovery of nonferrous metals:
manganese, copper, cobalt, and nickel, is examined [6,
A study of the material composition of IMCs has
shown that the main mass of the ore component is
represented by iron and manganese hydroxides, and
nonferrous metals are isomorphically bound with
minerals of manganese and iron. A characteristic
feature of IMCs is their hygroscopic nature caused
by the developed surface of the material (its porosity
is 58%). The ecologically clean IMC material has the
form of ﬁ nished rounded grains with a granulometric
composition suitable for use in bulk ﬁ lters.
Table 1 compares the main chemical composition
of concretions from the Kopor’e Bay, found by X-ray
ﬂ uorescence technique, with the composition reported
The large stock, comparatively large speciﬁ c surface
area and high sorption capacity, and possibility of
utilization or regeneration make application of IMCs in
puriﬁ cation technologies economically sound.
This study is concerned with the isotherm of lead–
sodium ion exchange on the IMC surface.
Natural samples of iron-manganese concretions
contain various exchange cations, and, therefore, the
IMCs were converted before experiments to the sodium
form because sodium ions are the most easily displaced
by other cations .