PROMISING TECHNOLOGIES FOR REFRACTORIES
OF THE UNMOLDED TYPE FOR VARIOUS HEATING UNITS
E. A. Kondrat’ev,
M. A. Valiulina,
and I. N. Kiprishchikova
Translated from Novye Ogneupory, No. 11, pp. 23 – 29, November 2008.
Original article submitted April 28, 2008.
Prmising technologies are presented for preparing unmolded refractories for lining heating units. Properties
for unmolded refractories, and results of testing them in various enterprises are provided. Work of an engineer
ing section is described that was created on the basis of the Bogdanovich OAO Ogneupory.
An installation has been created in Bogdanovich OAO
Ogneupory fitted withall of the necessary equipment in order
to produce new unmolded refractory mixes and mixtures.
Lightweight heat insulating concrete. The enterprise
manufactures lightweight concretes with an application tem-
perature from 1250 to 1550°C and an apparent density from
0.6 to 1.3 g/cm
. Particular attention should be devoted to
lightweight concrete grade SBLT-1.3-1450. This concrete is
a heat insulating-structural material with an application tem-
perature up to 1450°C, and it has been successfully tested as
a replacement for imported dry concrete mixes and used as
the working layer for the roof of a unit for drying and
warm-up of steel pouring ladles. It exhibits corrosion resis
tance and mechanical strength sufficient for assembly and
operation, and low thermal conductivity. The physicochemi
cal properties of lightweight concretes heat insulating are
presented in Table 1.
Today the assortment of lightweight heat insulating con
cretes is represented by seven grades among which four are
chamotte, two are corundum and one is mullite-corundum.
The physicomechanical properties of the heat insulating
lightweight concretes are presented in Table 2.
Heat insulating concretes are currently used in enter
prises of the fuel and energy complex, in lining units for
burning gas, i.e. pre-combustion chambers in OOO Nefte
mash (Syzran’). It should be noted that lightweight concretes
are used not only as heat insulation, but also as boundaries
for lining mixes, for the roofs of steel-pouring ladles, and
other heating units. Currently a considerable volume of light
weight concretes is realized through OOO Tekhnokeramika
(shaft furnace lining), and OOO Kholdi Stroi.
Buffer mixture and side mix. At the request of metal-
lurgists manufacturing technology has been developed and
assimilated for a buffer mixture and a plastic side mix
cording to test results it was concluded that side mix
VGOP-75 exhibits favorable features:
high plasticity and convenient packing guarantees suit-
ability for performing lining work;
low sensitivity to drying does not require special regimes
for start-up in operation, prevents crack formation and crum
bling of a mix from a joint;
the mix is not only free of shrinkage, but it also gives the
optimum volumetric growth during operation of a ladle and
this promotes additional compaction of a joint and increases
the period between repairs;
high quality and stability of the starting materials guaran
tees high service characteristics for the mix.
The largest users of the buffer mixture and side mix are
the A. K. Serov OAO Metallurgical Plant, OAO Northern
Pipe Plant, a branch of the OAO Nizhneserginsk Metallurgi
cal Hardware Combine, i.e. Revdisnsk Metallurgical hard
ware Combine, OAO Oskol’sk Plant for Metallurgical Engi
neering. Testimonials about the service properties of the
product are favorable, that have been confirmed by test re
ports. The production potential makes it possible in the short
est time to complete orders with a volume of the order of
60 tons per month. The buffer mixture is supplied in contain
Refractories and Industrial Ceramics Vol. 49, No. 6, 2008
1083-4877/08/4906-0432 © 2008 Springer Science+Business Media, Inc.
Bogdanovich OAO Ogneupory, Bogdanovich, Sverdlovsk Re
OOO Ogneupornyi Beton, Bogdanovich, Sverdlovsk Region,
Physicochemical properties of buffer mix VGBM-75 according to
TT 203-80–2008 and side mix VGOP-75 according to TT 203-
81–2008 are provided in Novye Ogneupory, No. 3, p. 37 (2008).