START-UP OF THE PRODUCTION OF MULLITE-SILICIC
N. A. Vyatkina
Translated from Novye Ogneupory, No. 3, pp. 130 – 131, March 2011.
Original article submitted January 19, 2011.
A production line for the fabrication of MKRIO-1260 mullite-silicic needle—punching blanket has been
placed in service. The production process has been mastered and a product standard formulated. The quality
indicators of the blanket correspond to the requirements of the Chinese standard GB/TI6400–2003.
Keywords: production line, mullite-silicic needle-punching blanket, enterprise standard
In 2010 a production line for the fabrication of
mullite-silicic needle-punching blanket was put into opera-
tion at the magnesite powders shop of Bogdanovich OAO
Ogneupory. The line has an annual productivity of 1000 ton.
Equipment for the production line was purchased in China
from the Shandung Company for the production of ecologi-
cally clean mullite-silicic Alert fiber.
The blanket manufactured by Bogdanovich OAO
Ogneupory is an efficient energy-saving material with low
heat conduction and high thermal stability, and is technologi-
cally effective in applications. The material is chemically re-
sistant to hydrocarbons, including oils and acids (except for
hydrofluoric and orthophosphorous acid), alkalis, and water.
Its range of application lies in thermal insulation of
high-temperature plants and devices, hermetic sealing of the
joints of heating furnaces, the fabrication of the units and
modules of machines, elements of furnace lining, thermal
The production line fits compactly in a single compart
ment. Smelting of the mullite-silicic raw material is per
formed in a resistance furnace with installed capacity
1000 kW. The smelt that is produced is fed to a centrifuge,
the shafts of which rotate at high speed. By means of centrif
ugal force the smelted matter is transformed into a fiber. In
creating the fiber, a softening agent is used to produce good
conditions of forcing through of the cotton in the course of
puncturing and reduced wear of the needle. Blanket fabri
cated with the use of a centrifuge is more wear-resistant un
der tensile conditions and more elastic than is blanket that is
produced by the spraying method, due to the greater length
of the fiber. This is an important factor when the blanket is
used in “difficult” areas of application and in the casting of
Now for the production cycle. Under the effect of dis-
charge the fiber is distributed uniformly in a precipitation
chamber. In order to establish a required thickness of the
layer of cotton, the material is made to pass through a photo-
electric system. The thickness and required density of the
material, which depends on the speed of the mesh belt drives,
are adjusted according to the weight of the layer of cotton by
means of a cleat. A two-sided punch transforms the layer of
cotton into blanket. The blanket then enters a furnace for heat
treatment at a temperature of 300 to 700°C. The softening
agent is then removed and final casting of the blanket is
achieved at the same time it is freed of crystals (nonfibrous
inclusions). The blanket next travels into a system that per
forms length and cross cutting and spinning of the product
into a coil. The coils are packed into film packets or card
board boxes. The technology is pollution-free. Wastes from
the centrifuge or produced in the course of cutting are re
turned to the smelt.
From the results gained from mastery of the technology,
a production manual was created and enterprise standard for
the finished product, STO 05802299-001–2003, entitled
Mullite-Silicic Needle-Punching Blanket, developed. The
temperature for maximum short-term use of the blanket is
1260°C, i.e., the temperature when in continuous use is
100 – 150°C lower.
Heat conduction tests on samples of the blanket thus cre
ated were performed in China and tensile tests were carried
out at the OAO Sukholozh Refractory Plant (Table 1). The
values correspond to the requirements of GV/T 16400–2003
with considerable margin. The general part of the standard
Refractories and Industrial Ceramics Vol. 52, No. 2, July, 2011
1083-4877/11/05202-0116 © 2011 Springer Science+Business Media, Inc.
Bogdanovich OAO Ogneupory, Bogdanovich (Sverdlovsk Re