Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 3, pp. 348−351.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © A.A. Yakovleva, Vo Dai Tu, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 3, pp. 371−374.
AND INDUSTRIAL INORGANIC CHEMISTRY
Ion Exchange on Clay Minerals from Some
Deposits of Irkutsk Region
A. A. Yakovleva and Vo Dai Tu
National Research Irkutsk State Technical University, Irkutsk, Russia
Received March 11, 2011
Abstract—The nature and ion-exchange capacity of clay minerals obtained from a number of deposits of Irkutsk
region was studied. The effect exerted by acidity of the medium on the ion-exchange process and the dependence
of the cation exchange capacity of clay on the ionic strength of electrolytes were determined.
Clays are the most commonly used types of rocks, form-
ing up to 11% of the total volume of the earth crust. They
are used on large-scale in different areas (construction of
building foundations and civil engineering projects, as a
raw material for ceramics and cement, and as ﬁ ller in the
manufacture of rubber and paper). In chemical engineering
they are used for the production of catalysts and sorbents.
The Irkutsk region has a large supply of various clays:
low-melting clay (Kuitunskoe, Tulunskoe, Nikol’skoe,
and Slyudyanskoe deposits), refractory clay (Nikol’skoe
and Bulusinskoe deposits), ﬁ reproof clay (Troshkovskoe
and Kamenskoe deposits), kaolines (coal deposits of
Irkutsk basin), and bentonites (Razgonskoe ﬁ eld ) [1–3].
Despite wide application, clays of Irkutsk region
are studied little in view of colloid-chemical charac-
teristics and no the relationship exists between their
structure, dispersion, and adsorption properties .
The study is concerned with the ion-exchange capacity
of clays obtained from some deposits of Irkutsk region
and its dependence on pH of the medium and the ionic
strength of electrolytes.
We used clays from three deposits of Irkutsk region
(Troshkovskoe, Nichol’skoe, and Slyudyanskoe). After
the mechanical cleaning, pieces of minerals were crushed,
ground, and scattered on the sieves to obtain powder with
a particle size less than 63 μm, which was then puriﬁ ed
(clariﬁ ed) with a 4% aqueous suspension. Carbonates and
organic impurities were removed with 0.001 M hydro-
chloric acid and 1% hydrogen peroxide. This method of
clay puriﬁ cation was used in [4–6].
Clays were calcined to 550°C, saturated with ethylene
glycol, and their composition after the puriﬁ cation and
separation was studied by the X-ray phase analysis (D8
ADVANCE diffractometer). The results showed that clay
from the Troshkovskoe deposit (TD) contains kaolinite
(major component) and montmorillonite, clay from the
Nikol’skoe deposit (ND), kaolinite (major component)
and halloysite. Clay from the Slyudyanskoe deposit
(SD) contains a mixed-layer montmorillonite and mica.
Thus, the TM and HM clays belong to kaolinite, and the
CD clay, to the group of a mixed-layer montmorillonite-
The ion exchange was studied by the potentiometric
titration [7–9]. The cation exchange was performed in
potassium chloride solutions, wherein the K
exchanges against proton on clay minerals:
As known, the ion-exchange on clays and soils is
the thermodynamically reversible process [10, 11]. In
study of the ion exchange on clay surface, the time till
establishing equilibrium τ
is the important parameter,