PRODUCTION AND EQUIPMENT
A STUDY OF THE POTENTIAL FOR THE USE OF HIGH-ALUMINA SLAG
IN THE PRODUCTION OF REFRACTORIES
N. A. Bosyakova,
E. V. Stepanova,
E. V. Murashko,
S. A. Pomortsev,
V. A. Artyushin,
and A. N. Balashov
Translated from Novye Ogneupory, No. 9, pp. 14 – 16, September, 2012.
Original article submitted March 12, 2012.
Results of laboratory and pilot-plant studies relating to the use of high-alumina slag obtained in the production
of chromium metal in the technology of aluminosilicate refractories are presented. The following are recom
mended for management of the production of aluminosilicate articles based on clay stock enriched with chro
mium metal slag: use of slag with Al
content at least 77% and CaO content at most 8%; complete incoming
control of the slag; and operational correction as a function of the chemical composition of the slag, the physi-
cal composition of the charge, and the roasting conditions.
Keywords: high-alumina slag, aluminosilicate refractories, refractory clay
The range of products manufactured by OAO Magnito-
gorsk Metallurgical Combine (OOO Ogneupor) embraces a
wide assortment of aluminosilicate articles with alumina
content from 32 to 45%. Clay from the Arkalyk and Berlinsk
deposits serves as the raw material for the production of the
articles. The approximate chemical composition of these
clays is presented in Table 1
In the production of articles for domestic use, Berlinsk
clay serves only as a binder component on the molding stage,
since an article with alumina content greater than 37% can
not be obtained from a single block of Berlinsk clay. Re
serves of clay from the Arkalyk deposit that are unique in
terms of alumina content and technological properties have
been exhausted, which has led to a reduction in the fraction
of Arkalyk clay in the composition of aluminosilicate articles
and, as a consequence, to the appearance of problems associ
ated with the preservation of the range of manufactured
product. It has thus become necessary to enrich raw Berlinsk
clay with alumina.
Slag obtained in the course of the production of chro
mium metal was selected as the enriching high-alumina addi
tive. The choice of this type of slag was dictated by the posi
tive results of studies and research efforts focused on promis
ing raw materials for the production of aluminosilicate
refractories [1 – 4]. According to the results of these studies,
slag that has formed in the course of the production of
ferroalloys according to an aluminothermic method are char-
acterized by high Al
content and elevated refractoriness.
Moreover, these types of slag are the types of high-alumina
raw materials that are the most plentiful in the Ural region.
Three samples of slag (No.1–3) from different ferroalloy
factories were used in the laboratory studies. The results of a
chemical analysis of the laboratory samples of slag are pre
sented in Table 2.
Laboratory samples with different weight fractions of
slag in the charge were fabricated in order to estimate the in
fluence of the slag addition agent on the quality indicators of
aluminosilicate refractories. A composition of charge of
chamotte ladle articles based on Berlinsk chamotte was
adopted as the control sample for the first series of samples,
using Slag No. 1 in the form of a fraction finer than 3 mm.
Refractories and Industrial Ceramics Vol. 53, No. 5, January, 2013
1083-4877/13/05305-0289 © 2013 Springer Science+Business Media New York
OAO Magnitogorsk Metallurgical Combine, Magnitogorsk, Russia.
TABLE 1. Chemical Composition of Refractory Clays
Percentage Weight fraction, %
Berlinsk 28 – 36
Arkalyk 45 – 54