1070-4272/02/7501-0050$27.00C2002 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 75, No. 1, 2002, pp. 50!53. Translated from Zhurnal Prikladnoi Khimii, Vol. 75, No. 1,
2002, pp. 50!53.
Original Russian Text Copyright + 2002 by Aliev, Vladimirova, Kharlamova, Malofeeva.
AND CORROSION PROTECTION OF METALS
Synthesis of Zinc and Nickel Carbonates by Anodic
Dissolution of Metals in Electrolyte Solutions under Elevated
Carbon Dioxide Pressure
Z. M. Aliev, M. V. Vladimirova, T. A. Kharlamova, and L. S. Malofeeva
Moscow State University of Food Industry, Moscow, Russia
Received April 25, 2001
Abstract- The process of single-stage electrochemical preparation of pure zinc and nickel carbonates
in solutions saturated with carbon dioxide under elevated pressure was studied.
Special-purity zinc and nickel carbonates find use
in medicine, semiconductor technology, and manufac-
ture of various sorbents and catalysts. Purification of
carbonates to remove impurities is a labor-consuming
process, and, therefore, it is advisable to obtain pure
products directly, by anodic dissolution of the corre-
Electrochemical methods for carbonate preparation
have been described in the literature. For example,
an electrochemical method for production of basic
zinc carbonate is known , according to which zinc
is anodically dissolved in an electrolyte containing
15320 g l
of sodium hydroxide and 903100 g l
of sodium nitrate. The process is carried out at
a current density of 0.0930.10 A cm
In order to obtain carbonates of various metals, the
authors of  subjected a metal (Pb, Ni, Zn, etc.) to
anodic dissolution in an ammonium carbonate solu-
tion at high current density with simultaneous con-
tinuous bubbling-through of ammonia and carbon
dioxide. The method yields target products with high
An electrochemical method has been described for
obtaining metal carbonates by anodic dissolution of
the corresponding metal in an aqueous ammonium
carbonate solution with bubbling of carbon dioxide
through the aqueous solution at a current density of
0.1030.15 A cm
and constant carbon dioxide pres-
sure in the autoclave of 0.531.0 MPa .
The study  was also concerned with preparation
of basic lead and copper carbonates in anodic dissolu-
tion of the corresponding metal in a diaphragm elec-
trolyzer with the use of multicomponent electrolytes.
The common disadvantage of all the proposed
methods consists in use of concentrated solutions of
various electrolytes, from which it is difficult to iso-
late pure carbonates. In order to lower to the maxi-
mum possible extent the electrolyte concentration and
obtain sufficiently pure zinc and nickel carbonates
in a single stage, we studied the process of their elec-
trochemical preparation in solutions saturated with
carbon dioxide under elevated pressure.
Measurements under elevated pressure were done
in a specially designed autoclave made of a corrosion-
resistant titanium alloy . Valves for gas supply,
pressure gage, and current leads for the electrodes
were built in the autoclave cover.
The electrical conductivity of carbon dioxide satu-
rated water and aqueous electrolyte solutions was
determined using a versatile bridge with thermostating
at a prescribed temperature. Potentiostatic measure-
ments were carried out with a P-5827 M potentiostat.
Zinc and nickel plates were used as working elec-
trodes; platinum foil, as auxiliary electrode; and satu-
rated silver chloride electrode, as reference.
The effect of carbon dioxide pressure on electro-
chemical synthesis of zinc and nickel carbonates was
studied in distilled water and dilute aqueous solutions
of potassium carbonate (0.01 M) and sodium chloride
(0.05 M) in the same autoclave, with zinc and nickel
of, respectively, TsV and N1 U brands of 99% purity
used as anode materials. The current efficiencies (CE)
by carbonates were determined gravimetrically after
drying a deposit to constant weight.