PERICLASE-ZIRCON PACKING COMPONENTS
FOR GLASS-MELTING FURNACE REGENERATORS
A. P. Margishvili,
O. S. Kuznetsova,
and A. A. Kovalenko
Translated from Novye Ogneupory, No. 2, pp. 41 – 44, February, 2008.
Original article submitted October 23, 2007.
The company has developed the technology and production of periclase-zircon components for glass-melting
furnace regenerators. Tests have shown that they have substantial advantages over analogous items made in
Russia. The distinctive features of the new refractories are high mechanical strength, together with chemical
and erosion resistance to corrosive alkaline components. Physicochemical and thermophysical tests have
shown that the items have good performance when used in glass-industry furnace regenerators.
Glass-melting furnaces are operated in runs lasting more
than eight years in the production of the main types of
industrial glasses, which has required the use for lining the
regenerators and particularly packing them with refractory
materials that provide for successful operation throughout
the run without replacement, or in the extreme case of
replacement in hot repairs of individual parts of the refrac-
tory lining subject to conditions of ongoing temperature
change in the gas (every 20 – 30 min) in the upper part of the
regenerator from 1550 – 1600°C (hot side) to 1100 – 1300°C
(cold side), and in the lower part from 400 – 500°C to
650 – 750°C, with high concentrations in the flue gases of
dusty components of the charge and corrosive gases. In the
middle (60 – 80% of the height) the damage to the refracto
ries in the main is associated with the interaction of sulfur
trioxide with periclase in the upper parts of that zone and
with condensation of corrosive volatile components, mainly
alkali-metal sulfates, in the middle and lower parts of that
zone at 800 – 900°C. For these parts of the packing, it is best
to use periclase-zircon refractories, which on heating show
reaction of the zircon with the periclase with the formation of
zirconium dioxide and forsterite, which form a protective film
around the grains of periclase and prevent damage to them .
The company has developed a technology for making
highly refractory periclase-zircon components, which have high
density, high mechanical strength, and good alkali resistance.
Table 1 gives the physicochemical characteristics of these
periclase-zircon components made by the company.
Petrography shows that these components have good
density and structural features, with uniform distributions for
the components (Fig. 1).
Physicochemical changes occur in the material on high-
temperature heating, and the reactions give rise to highly
refractory phases such as forsterite 2MgO. SiO
and zirconium dioxide ZrO
= 2715°C). The forsterite-
zircon bonding agent produces a dense structure and strong
adhesion in the periclase matrix.
Creep determinations indicate the technical working life
of the periclase-zircon refractories made by the company as a
high-temperature material for regenerative chambers in glass
industry furnaces. The refractory deformation is dependent
not only on the load and temperature but also on the service
duration. Creep measurements enable one to calculate the
behavior under load at high temperatures.
ISO 3187–89 deals with creep determination under
compression. The tests were performed in a vertical tubular
electric oven with a loading device. A specimen was a cylinder
of diameter and height 50 ± 1 mm with an axial hole of
diameter 12 ± 1 mm, and it was loaded before the start of
heating with a calculated load of 0.2 ± 0.003 MPa, with the
heating performed at 5°C/min and the specimen kept at
500°C for 50 h. The following results were obtained with
Deformation in % during times in h of:
Creep rate in %/h in the following time interval in h:
The low creep rates of these PTs-1 plagioclase-zircon
components is due to the formation of a dense structure
during high-temperature heating, which is highly refractory
Refractories and Industrial Ceramics Vol. 49, No. 1, 2008
1083-4877/08/4901-0063 © 2008 Springer Science+Business Media, Inc.
Borovichi Refractories Company, Russia.