PRODUCTION AND EQUIPMENT
UNMOLDED REFRACTORY MATERIAL
PRODUCED BY OOO GRUPPA MAGNEZIT FOR FILLING
THE STEEL DISCHARGE CHANNEL OF STEEL POURING LADLES
L. M. Aksel’rod,
M. I. Nazmiev,
R. Sh. Nazmutdinov,
D. A. Marchenko,
and L. A. Valeeva
Translated from Novye Ogneupory, No. 11 pp. 20 – 22, November 2009.
Original article submitted June 22, 2009.
Preparation technology, assimilation of production and application of a starting mix in steel-pouring assem
blies of steel-pouring ladles, operating under conditions of steel pouring into molds and in CBCM are pro
vided. The material developed is used successfully in a number of Russian metallurgical enterprises.
Keywords: unmolded material, starting mix, stopper-dispensing device, steel-pouring ladle, chromite.
A starting mix is an unmolded refractory material used in
charging the channel of a stopper-dispensing device, through
which discharge of molten metal is accomplished from a
smelting or transport metallurgical unit. As is well known, a
starting mix should flow out freely from the pouring channel
on opening the gate without additional mechanical or other
action, without force, burning, etc., and it should also be inert
with respect to the melt in a ladle. As a starting mix
steel-pouring ladles it is traditional to use various materials:
quartz sand, veined quartz, stavrolite concentrate, alumino
silicate granules of a spherical shape, etc., normally with ad
dition of a carbon component.
OOO Gruppa Magnezit has developed technology for
producing starting mix grade SST-Kh, and its use has been
assimilated in metallurgical enterprises. The mixture is in
tended for filling channels in steel-pouring ladles of different
capacity, including those where extra-furnace metal treat
ment is proposed (in aggregates of the furnace-ladle type),
evacuation of metal, including with use of an RH vacuum
unit, and also in ladles operating as transport, with a pro
longed dwell time of metal in a ladle from 1.5 to 3.0 h, and
sometimes more. The starting mix has been created in coop
eration with OAO Zlatoustov Metallurgical Plant (OAO
ZMZ) that in the first stages of developing the starting mix
provided the possibility of proving it. Whereas in the
open-hearth production of this enterprise the starting mix,
consisting of quartz sand and coke breeze, had proved itself,
under conditions of the electric steel smelting workshop
(ESSW) a requirement arose for using qualitatively new ma-
terials. In the ESSW metal is poured from a 15-ton ladle,
equipped with one slide gate. The pouring is siphon through
one central mold in four of 2.7 ton each. The main disadvan
tages of the mix based on SiO
are their high tendency to
wards sintering in the steel-pouring channel, and reaction
with the melt as a result of which there is closing of the
steel-pouring channel and arch formation in the layer of mix
above this channel . In this case on opening the slide gate
pouring was started on burning through sintered starting mix
with oxygen in the steel-pouring channel. As a result of parti
cles of mix falling with the melt into a mold, oxidation prod
ucts of the metal increased the contamination of ingots by
surface defects and the susceptibility of a cast billet to oxide
inclusions. An unfavorable result of using the burn
ing-through operation includes the possibility of distortion of
the profile and melting of the edges of the channel plate of
the slide gate.
Workers of the research section of OOO Gruppa
Magnezit have developed compositions for starting mixes.
Various starting materials are used: fuzed powder with a
minimum impurity content that are inclined towards forming
readily melting compounds, and also chromite ores from var
ious deposits, differing in substance composition (ferrous
Refractories and Industrial Ceramics Vol. 50, No. 6, 2009
1083-4877/09/5006-0412 © 2009 Springer Science+Business Media, Inc.
OOO Gruppa Magnezit, Moscow, Russia.