COMPARATIVE STUDY OF CHROMITE-PERICLASE
AND PERICLASE-CARBON REFRACTORY STABILITY DURING
REACTION WITH NICKEL PRODUCTION MELTS (EXPERIMENTAL DATA).
1. BEHAVIOR OF CHROMITE-PERICLASE REFRACTORIES
IN THE PRESENCE OF METAL-SLAG AND SLAG MELTS
T. I. Shchekina,
A. M. Batanova,
T. N. Kurbyko,
A. N. Pyrikov,
and B. N. Grigor’ev
Translated from Novye Ogneupory, No. 11, pp. 31 – 43, November, 2014.
Original article submitted September 8, 2014.
Results are provided for mineral and petrographic study of phase formation and structural changes in chro
mite-periclase refractories after experiments for their reaction with slag melt and with slag-nickel melt. A re
action mechanism is established for refractories with melts and it is shown that a metal-slag melt exhibits sig-
nificantly greater refractory corrosiveness than slag.
Keywords: chromite-periclase refractory, chemical and phase composition, slag and nickel melts, corrosion,
slag resistance, slag-metal resistance.
The aim of the work is comparison of the stability of
chromite-periclase (Cr–Per) and periclase-carbon (MgO–C)
refractories with action on them of melts simultaneously of
slag and nickel and slag alone under laboratory conditions
with experiment parameters similar to those existing in
nickel production. In part 1 of the article results are consid
ered for an experiment with chromite-periclase refractory,
and in part 2 data are presented for periclase-carbon refrac
tory, and also comparative analysis of the stability of two
types of refractory in two types of melts. Currently in publi
cations [1 – 5] there is material indicating that periclase-car
bon refractories exhibit greater thermal shock resistance and
chemical resistance to action of slag-metal melts than chro
mite-periclase refractory. However, reasons and the essence
of this phenomenon have not been studied sufficiently.
In order to resolve this problem experiments have been
performed  in laboratory furnaces of the Center for Scien
tific and Technical Development PAO Zaporozhogneupor.
Ground slag was charged together with nickel into a crucible
of chromite-periclase refractory grade KhPTU (used in PNB
5500 furnaces of the nickel plant of ZF OAO Noril’skii
Nikel’) and periclase refractory grade PU-9, heated to
1600°C at atmospheric pressure, and held under these condi-
tions for 12 h. Microsections from the specimens obtained in
an epoxy resin base and polished sections were prepared,
which included the region of refractory in a crucible subject
to more intense transformation.
Changes in refractory were studied by optical and elec
tron microscopy, the material phase and chemical composi
tion were determined before and after an experiment, and the
data obtained for two types of refractory were compared.
Data are presented in Table 1 for studying structure, phase,
and chemical composition of the original chromite-periclase
(specimen No. 1) and two test specimens, one of which was
prepared with reaction of slag melt (specimen No. 3) and the
second with metal-slag melt (specimen No. 4).
Comparative analysis was carried out using an Opton
binocular optical microscope and a GL JSM-6480LV elec
tron microscope, and detailed analysis of the texture of struc
ture was performed using images in back-scattered electrons
(BSE). For clearer diagnosis of phases, their distribution
within specimens and characteristic radiation of individual
elements was used to reveal quantitative ratios. Chemical
composition of phases was studied by means of an energy
dispersion electron probe microanalyzer based on a GL
JSM-6480LV scanning electron microscope in an INCA-En
Refractories and Industrial Ceramics Vol. 55, No. 6, March, 2015
1083-4877/15/05506-0516 © 2015 Springer Science+Business Media New York
M. V. Lomonosov Moscow State University, Russia.
OOO OgneuporTreidGrupp, Moscow, Russia.