PERICLASE-CARBON REFRACTORIES FOR SERVICE
IN THE SLAG ZONE OF AN OXYGEN CONVERTER
B. M. Boichenko,
V. I. Pishchida,
K. G. Nizyaev,
and S. N. Kravets
Translated from Novye Ogneupory, No. 1, pp. 29 – 31, January, 2005.
Original article submitted November 12, 2004.
Based on data of petrographic and x-ray spectral microprobe analyses of periclase-carbon specimens sampled
from the refractory lining of a decommissioned oxygen converter, a mechanism for the corrosive attack of slag
on the refractory material is proposed and its kinetic parameters discussed.
The goal of our study was to inspect the performance of
a periclase-carbon refractory in the slag zone of an oxygen
converter. Refractory specimens for testing were sampled
from an area located close to the trunion of the converter that
was temporarily removed from service after a campaign of
2000 heats. The area in question was the most affected by
wear, and it was not protected by a scull from attack by the
The test specimens were analyzed petrographically at
´ 500 magnification in reflected light under an Epignost 21
microscope; the refractory hot zone (operating zone) and the
least affected zone were inspected. The specimens were ana
lyzed for quantitative and qualitative composition by the
x-ray spectral method on a Cameca MS-46 microprobe using
KAP and PET crystal analyzers. The component concentra
tions at specified points were determined using a personal
computer and a “PAP, Cameca” program; relevant data are
given in Fig. 1.
The concentration profiles in Fig. 1 traced as the micro
probe and microscope were moved in the direction hot zone
(HZ) ® least affected zone (LAZ) indicate that periclase
grains are surrounded by liquid low-basicity slag and iron
oxides as the slag and iron oxides find their way along the
Considering that the FeO concentration in the LAZ de
creases from 50% to 0 over a distance of 0.2 mm, iron oxides
should regarded as the most consumable component of the
slag infiltrated in close vicinity of the LAZ. At the HZ/LAZ
boundary, minute reguluses make their appearance. This in-
dicates the early stage of wear of the periclase-carbon refrac-
tory schematized by the reaction
Refractory Slag Reguluses Pore formation
Even a microscopic pore may serve as the site for nucle-
ation and growth of a CO gas bubble; therefore to inhibit the
nucleation of CO bubbles and to retard reaction (1), the po
rosity of the refractory should be reduced to a minimum. A
necessary condition is also the absence of through pores
which provides conditions for closing the channels with gas
Refractories and Industrial Ceramics Vol. 46, No. 2, 2005
1083-4877/05/4602-0101 © 2005 Springer Science+Business Media, Inc.
Based on materials reported to the 8th Congress of Steelmakers
(18 – 22 October, 2004, Nizhny Tagil, Russia).
Petrovskii Dnepropetrovsk Metallurgical Works Joint-Stock Co.,
Dnepropetrovsk, Ukraine; National Metallurgical Academy of
Ukraine, Dnepropetrovsk, Ukraine.
0 500 1000 1500 2000 2500
Fig. 1. Concentration curves for FeO, SiO
, and MgO (a) and CaO
and MnO (b ) traced by a microprobe across the periclase-carbon re
fractory in the slag zone of an oxygen converter.