1070-4272/05/7806-0891 C 2005 Pleiades Publishing, Inc.
Russian Journal of Applied Chemistry, Vol. 78, No. 6, 2005, pp. 891!896. Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 6, 2005,
Original Russian Text Copyright + 2005 by Kolosnitsyn, Minnikhanova, Karaseva, Dmitriev, Muratov.
AND CORROSION PROTECTION OF METALS
Possibility of Depositing Electrolytic
Manganese Dioxide onto Titanium Anodes
from Manganese Chloride Solutions
V. S. Kolosnitsyn, E. A. Minnikhanova, E. V. Karaseva, Yu. K. Dmitriev, and M. M. Muratov
Institute of Organic Chemistry, Ural Scientific Center, Russian Academy of Sciences, Ufa, Bashkortostan, Russia
Kaustik Private Company, Sterlitamak, Bashkortostan, Russia
Received September 1, 2004; in final form, February 2005
Abstract-Fundamental aspects of the deposition of electrolytic manganese dioxide from chloride electrolytes
were studied. The optimal parameters of the electrolysis on titanium anodes were determined.
In production of organochlorine compounds, a large
amount of hydrochloric acid is formed as a waste gas
). Therefore, it is necessary to develop pro-
cesses that would make it possible to utilize HCl
to give a new commercial product. One of the main
ways to utilize HCl is its use for leaching-out of man-
ganese ions from oxidized manganese ores (substan-
dard manganese ores, floatation tails, and other man-
When oxidized manganese ores are decomposed
with hydrochloric acid, chlorine and manganese chlo-
ride solutions are formed by the reaction:
Chlorine can be used in manufacture of organo-
chlorine compounds and MnCl
lytic manganese dioxide (EMD), and electrolytic
manganese metal (EMM).
Thus, two problems can be solved in the same
technological process: utilization of HCl
cessing of substandard manganese ores and other
manganese-containing wastes. The use of HCl
manganese-containing wastes as raw materials will
make it possible to develop a competitive process for
manufacture of EMD and EMM .
It should also be noted that MnO
chloride electrolytes is a more electrochemically ac-
tive and pure material .
In developing a process for obtaining electrolytic
, a considerable attention is paid to the choice
of the anode material. As the anode material for elec-
trolysis of MnCl
solutions were used iridium ,
platinum , lead coated with lead dioxide , graph-
ite , ORTA, and titanium electrodes coated with
titanium carbide or manganese dioxide . Be-
cause platinum and iridium are very expensive metals,
it is unreasonable to use them in industrial electro-
lysis. Lead anodes contaminate MnO
with lead di-
oxide through their dissolution in the course of elec-
trolysis. Graphite anodes gradually burn away because
of the partial evolution of hydrogen and should be
replaced at regular intervals.
We suggested that less expensive metal anodes,
widely used in electrolysis with evolution of chlorine,
can be used to obtain EDM, because a manganese
dioxide film formed on titanium at the beginning of
electrolysis will increase its corrosion resistance.
In this study, we examined the possibility of ap-
plication of titanium anodes for deposition of EMD
Manganese(IV) oxide was synthesized in a Plexiglas
electrolyzer with plane-parallel electrodes. VT-1-00
titanium plates (150 0 70 0 2 mm) were used as the
anode, and Kh18N10T stainless steel, as the cathode.
The separation between the opposite electrodes was
Prior to the electrolysis, the surface of the electrodes
was trimmed with an M-40 emery paper, washed