REFRACTORIES IN HEAT UNITS
THERMAL CONDITIONS OF THE BASE PLATE AND CATHODE LINING
IN ALUMINUM ELECTROLYZERS AT THE EARLY SERVICE PERIOD
M. P. Kononov,
A. N. Bogomolov,
E. N. Panov,
V. S. Larin, and G. N. Vasil’chenko
Translated from Novye Ogneupory, No. 10, pp. 72 – 75, October, 2004.
Original article submitted June 22, 2004.
Results of a one-year follow-up inspection of two groups of aluminum electrolyzers with variously designed
cathode unit refractory linings are reported.
Here we report on the results of an inspection of the lin-
ing and heat insulation of two groups of electrolyzers in ser-
vice at the Volgograd Aluminum Smelting Plant. The
electrolyzers inspected were of the same type and the same
age, and were serviced under the same operating and mainte-
nance conditions. Likewise, carbon-based lining materials
were of the same type, as well as the conditions for installa-
tion, for therun-in heating regime, and for putting into opera-
tion. However, the two groups differed in the design of the
electrolyzer base plate. One group of electrolyzers (control
electrolyzers) had a base plate made up from domestic
chamotte and diatomite materials. In the other group (test
electrolyzers), the base plate was fabricated using calcium
silicate and a dry barrier mix (DBM) purchased from a for
eign manufacturer. A design concept for the test electrolyzers
was that, in the initial operation stage, their thermal operat
ing parameters should be similar to those of the control
To control the thermal regime of the cathode unit,
thermocouples were inserted in the base plate of the test
electrolyzers as shown schematically in Fig. 1.
Temperature profiles over the outer surface of the ca
thode casings of test electrolyzers and control electrolyzers
are shown in Fig. 2; the measurements were made within a
period of two weeks after start-up. The results presented
were averaged over all sections and all electrolyzers. In the
early stage of inspection, maximum temperatures for the bot
tom and the lateral areas of the base plate were in good
agreement with the calculated values.
Over the period when measurements were made, the
temperature regime of the upper zone of the cathode casing
was not yet quite stable. Still, the outer surface temperature
was in good agreement with the temperature measured inside
the base plate (Fig. 3).
Refractories and Industrial Ceramics Vol. 46, No. 2, 2005
1083-4877/05/4602-0089 © 2005 Springer Science+Business Media, Inc.
Volgograd Aluminum Joint-Stock Co., Volgograd, Russia; Kiev
Polytechnical Institute (NTUU), Kiev, Ukraine.
Fig. 1. Schematic diagram showing the location (
) of thermocou
ple junctions (T ) for measuring the temperature of cathode and
anode casings: a) alumina; b ) bell; l, m, and u ) lower, middle, and
upper zone of the anode, respectively; o ) operating floor; s ) electro
lyte surface; r ) anode rods.