–SiC–C CONCRETES PRODUCED FROM RECYCLED MATERIALS
TO MAKE BAFFLES FOR CONTINUOUS-CASTER TUNDISHES
K. N. Vdovin,
V. V. Tochilkin,
and K. G. Pivovarova
Translated from Novye Ogneupory,No.4,pp.8–11,April, 2015.
Original article submitted December 9, 2014.
The use of recycled materials to make the baffles of continuous-caster tundishes is examined. It is determined
that the baffles must be heated in three stages when they are made from concrete with a recycled mullite-silica
filler. The baffles are heated in an oxidizing atmosphere in the shop, which can cause graphite to be burned out
of them. The loss of the graphite could in turn diminish the baffles’ resistance to slag during their use in tun
Key words: baffle, tundish, concrete mixture, differential scanning calorimetry.
The character of flow of liquid metal in a tundish during
continuous casting is the main factor that determines the dis-
tribution of nonmetallic inclusions in the semifinished prod-
uct. One way of reducing the metal’s content of these inclu-
sions is their assimilation by the covering slag in the tun-
Special devices such as baffles are installed in tundishes
to limit the flow of metal from the ladle nozzle directly into
the tundish. The baffles separate nonmetallic inclusions from
the flow by making it move in the required direction .
Refractory baffles function under demanding service
conditions, being in contact with liquid slag and metal and
undergoing thermal shocks. The baffles are thus made of
high-quality low-cement and ultralow-cement concrete mix
tures based on corundum. This gives the baffles superior
structural strength and good resistance to deformation and
chemical attack at high temperatures .
Given the increasingly stringent environmental standards
being introduced and the efforts being made to make effi
cient use of natural resources while reducing production
costs and the generation of factory wastes, attempts are being
made to find ways of using such wastes in the production of
The most promising types of industrial waste for use as
fillers in refractory concretes are those that contain stable
crystallized compounds — chromium-alumina wastes 
and silicon-carbide wastes .
The Magnitogorsk Metallurgical Combine (MMK) has
done work on replacing fillers made of expensive corundum
in the composition of dry concrete mixture SVN-80, which is
used to make tundish baffles. The goal is to instead employ a
less costly filler made with the use of a recycled mullite-sil-
ica-based material (RMSF). This filler is obtained from used
linings of hot-metal-car ladles (Table 1) and is a mullite-co-
rundum composition with additions of graphite and silicon
Table 1 shows the chemical compositions of the
refractories of the Al
–Si–C system that are usually used
to line the metal bath and slag zone of torpedo-type
hot-metal-car ladles. The table also shows the RMSF being
used as the filler of concrete mixtures employed in the fabri
cation of tundish baffles at the MMK. It is apparent that the
RMSF contains much less graphite than the original lining.
Refractories and Industrial Ceramics Vol. 56, No. 2, July, 2015
1083-4877/15/05602-0122 © 2015 Springer Science+Business Media New York
Magnitogorsk State Technical University, Magnitogorsk, Russia.
TABLE 1. Chemical Composition of Al
of the components,
Initial lining  Pieces of lining from
metal bath slag zone
56.0 64.2 73.1
21.3 8.8 21.8
SiC 8.8 8.8 5.2
MgO — 5.8 —
— — 1.2
7.3 7.2 3.1