PERICLASE-CARBON REFRACTORIES FROM THE KOMBINAT MAGNEZIT
JSC FOR USE IN CONVERTER STEELMAKING TECHNOLOGY
AT THE MAGNITOGORSKII METAL-AND-STEEL WORKS JSC
O. F. Shatilov,
A. N. Datsko,
A. A. Shlyapin,
M. Yu. Turchin,
V. G. Ovsyannikov,
and T. K. Prishchepova
Translated from Ogneupory i Tekhnicheskaya Keramika, No. 2, pp. 42 – 43, February, 2002.
Cooperation between the Kombinat Magnezit Joint-Stock Co. and Magnitogorskii Metal-and-Steel Works
Joint-Stock Co. in the area of exploitation of converter refractories is briefly outlined. Prospects for further
improvement of the performance characteristics of refractories and converter design are discussed.
Modern steelmaking technologies using converters place
severe requirements on the endurance of the converter lining.
The oxygen-converter shop at the Magnitogorskii Metal-
and-Steel Works Joint-Stock Co. (MMSW JSC) during the
course of its eleven-year history has made use of a total of
130 sets of converter refractories, of which 102 sets (or 77.9%
of the total number) were purchased from one manufacturer,
Kombinat Magnezit JSC.
Until 1996, the Kombinat Magnezit JSC supplied con-
verter refractories of two types — periclase-chromite and
periclase-carbon. The endurance of converter linings pro
duced during those years was rather modest: for periclase-
chromite refractories it was from 315 to 729 heats (an aver
age of 497 heats), and for periclase-carbon — from 393 to
1006 heats (average 654 heats). Since 1996, only periclase-
carbon refractories have been in use at the MMSW JSC.
Higher endurance of periclase-carbon refractory compo
nents was achieved by using scull buildup technology, ad
vanced bricking techniques, improved performance charac
teristics of converter refractories, and modified operating
conditions. Over the past five years, the endurance of refrac
tory materials available from the Kombinat Magnezit JSC in
creased by a factor of 2.3. As was recorded in 2001, the en
durance of the lining in converter No. 3 at the MMSW oxy
gen converter shop was 3141 heats.
This was achieved through updating the scull buildup
– increasing the amount of scull accreted from 33.6 to
90.8% (see Table 1);
– increasing the concentration of MgO in converter slag
by the use of a mildly burned brown spar and PPK-75-grade
powder (available from Kombinat Magnezit JSC);
– blowing nitrogen through oxygen tuyeres.
The data in Fig. 1 show that increasing the MgO content
in slag causes an increase in lining endurance. By the actual
technological requirements, the MgO optimum slag concen-
tration for this particular refractory type is 10 – 13%.
A topographic analysis of the wear of the refractory lin-
ing from campaign to campaign revealed the most vulnerable
zones and led to design modification aimed at improving the
endurance of individual engineering components. Modifica
tions made in the design of refractory lining were:
– the reinforced layer thickness was increased from 230
to 300 mm, which provided a higher wear margin;
– the thickness of the working layer at the bottom was
decreased from 900 to 760 mm;
– the brickwork thickness in the straight zone was in
creased from 900 to 1040 – 1140 mm;
Refractories and Industrial Ceramics Vol. 43, Nos.1–2, 2002
1083-4877/02/0102-0081$27.00 © 2002 Plenum Publishing Corporation
Magnitogorskii Metal-and-Steel Works Joint-Stock Co., Magnito
gorsk, Russia; Kombinat Magnesit Joint-Stock Co., Satka, Che
lyabinsk Region, Russia.
MgO slag concentration, %
Fig. 1. Converter endurance related to the MgO slag concentration.