REFRACTORIES IN HEAT UNITS
ANALYSIS OF THE PROPERTIES OF HEAT INSULATION MATERIALS
BASED ON TATAR DEPOSIT VERMICULITE
G. E. Nagibin,
A. V. Proshkin,
A. A. Levchenko,
M. M. Kolosova,
A. G. Sbitnev,
O. A. Rezinkina,
and A. Yu. Vshivkov
Translated from Novye Ogneupory, No. 3, pp. 5 – 10, March 2009.
Original article submitted December 8, 2008.
Development of a new lining material with high chemical and deformation resistance based on vermiculite is
described. Properties of the objects obtained are provided that are not surpassed by overseas analogs. This
achievement is due to the use of a rational combination of raw material properties and technology regime pa
rameters. In efficiency, material based on vermiculite may replace diatomite materials used traditionally. Use
of objects based on vermiculite, having a density lower by a factor of three and lower thermal conductivity by
a factor of six instead of traditional heat insulation material, i.e. chamotte, opens the possibility of a reduction
in material content. The higher deformation resistance of the material promotes an increase in electrolyzer ser-
vice life. Therefore, objects based on vermiculite may be used successfully for heat insulation not only in
non-ferrous metallurgy installations, but also in thermal power engineering equipment, and in the construction
of objects for industrial and domestic purposes.
Keywords: vermiculite, aluminum industry, thermal conductivity, ultimate strength in compression, lining,
One way of resolving the problem of energy saving and
increasing the service life of electrolyzers is the use of high
quality heat insulating materials . Currently for heat insu
lation of electrolyzers the materials used most are based on
vermiculite and diatomite [1, 2]. Vermiculite objects for the
purposes of aluminum production are produced from raw
material of the Kordovsk deposit (Murmansk region). Here
the main aluminum plants who use of vermiculite objects are
located in Siberia. A continuous increase in the cost of en
ergy supply, worsening mining and geological conditions for
recovery of Kordovsk raw material, and also an increase
transport expenditure has given rise to a steady increase in
the cost of objects made from vermiculite.
Creation of electrolyzers with an increase in current
strength leads to an increase in the requirements laid down
for heat insulating materials, primarily structural stability,
strength and thermal conductivity. The last two properties are
mainly changed by the effect of sodium vapor and sodium
). An increase in material heat insula
tion leads to restructuring of the temperature field, that may
lead to bath growths with oxide cakes, and extreme forma
tion of crusts on the hearth, as a result of which it will be dif
ficult to pass current. A reduction in material strength may
also affect bath heat loss since under pressure the overlying
refractory and cathode blocks of the heat insulation layer, by
losing strength, may be compressed, which in turn may lead
to a reduction in heat conduction due to compression of heat
insulation and an increase in its thermal conductivity.
Results are provided in this work for a study of the prop
erties of heat insulation materials based on vermiculite from
the Tatar deposit (Krasnoyarsk region) that is at the boundary
of the Motyginsk and North Enisei regions. The deposit was
opened up in 1973. Ores of the Tatar deposit with respect to
ores of other deposits of Russia have a simple mineral com
position, they have relatively simple geological, hydrogeo
logical and engineering-geological conditions, that make it
possible to work them by an open method. The deposit is lo
cated under favorable natural conditions. Ore with a very
high vermiculite content was in a loose state and lies imme
diately beneath the soil and plant layer.
Refractories and Industrial Ceramics Vol. 50, No. 2, 2009
1083-4877/09/5002-0077 © 2009 Springer Science+Business Media, Inc.
Siberian Federal University, Krasnoyarsk, Russia.
ITTs OOO RusInzhiniring, Krasnoyarsk, Russia.
OOO RuVER, Sosnovoborsk, Krasnoyarsk Region, Russia.