ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 7, pp. 994−997. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © N.S. Velichkina, T.V. Vlasova, A.V. Kalashnikov, V.Yu. Kol’tsov, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 7,
In the production of nuclear-grade zirconium for
nuclear industry, mother liquors concentrated with iodine
are formed as liquid waste. After zirconium reﬁ ning by the
iodide method, iodinated circulating solution is used for
cleaning of apparatus and washing off reusable shavings.
Mother liquors cannot be drained by the following
reasons: (1) the iodine concentration in mother liquor is
0.28 g dm
(0.2–0.6 g dm
), on the average, i.e., con-
siderably exceeds the maximum permissible concentra-
tion (0.01 mg dm
) in the waste solutions monitored on
the basis of SanPiN ( Sanitary Rules and Regulations)
parameters providing ecological safety of the environ-
ment; (2) the process is unproﬁ table from the economical
standpoint, because the annual deadweight loss of iodine
is 500 kg, i.e., about 2.5 million rubles in terms of cost.
Extraction of iodine with KAD and BAU activated
carbons from brines and drilling waters is known .
The disadvantages of this scheme are the low mechani-
cal strength and chemical resistance of carbons and the
hard conditions for the extraction of iodine from a carbon
phase (its desorption).
In this study, the up-to-day high-efﬁ ciency technology
was developed for the treatment of waste mother liquors
with activated carbons to remove iodine.
To do this, the properties of modern carbon sorbents
in relation to their sorption capacity for iodine were stud-
ied, their service life was determined, various desorbing
reagents were characterized in terms of desorption, and
the recommendations were formulated on the use of the
selected brand of activated carbon and a desorbing agent
under industrial conditions.
Iodine sorption was studied with model and circulating
solutions. At production plants, iodine is precipitated from
a circulating solution with potassium permanganate in the
presence of sulfuric acid and then the pulp is ﬁ ltered. After
the ﬁ ltration, the remaining iodine is in the form of I
After the iodine precipitation, the solution has the follow-
ing chemical composition (mg dm
): Na 23.0, K 73.0,
Fe 4.8, Ca 11.7, Zn 0.08, Cd < 0.01, Ni 0.4, Co < 0.03,
Mn 167.0, Mg 15.0, Cu < 0.01, and I
Activated carbons were preliminarily tested under
standard conditions, and their static sorption capacities
for iodine were compared . The results are given in
As seen from the table data, the SKT-6a and VSK-400
carbons showing similar sorption capacity in a solution
containing 0.15 g dm
of iodine are the most suitable
brands ensuring minimum concentration of iodine in the
mother liquors. Because the peat carbon SKT-6a has a
lower mechanical strength than VSK-400 carbon, the
latter was chosen for further study. The NWMDH 3C
Extraction of Iodine from Mother Liquors Formed
as Industrial Waste with Activated Carbons
N. S. Velichkina, T. V. Vlasova, A. V. Kalashnikov, and V. Yu. Kol’tsov
Leading Research Institute of Chemical Technology, Kashirskoe sh. 33, Moscow, 115409 Russia
Received: July 2, 2014
Abstract—The possibility for sorption of iodine from mother liquors with activated carbons of varied brands was
determined. The sorbents were tested in laboratory in industrial conditions. The optimum brand of the sorbent was
chosen. The optimal conditions for the iodine sorption and desorption were recommended. For activated carbon
chosen, resource tests were performed.