EFFECT OF FELDSPAR CONCENTRATE
ON THE CHEMICAL RESISTANCE OF ACID-RESISTANT MATERIALS
PREPARED ON THE BASIS OF ARGILLACEOUS MATERIALS
OF DIFFERENT CHEMICAL AND MINERAL COMPOSITION
E. S. Abdrakhimova
Translated from Novye Ogneupory, No. 11, pp. 19 – 22, November 2008.
Original article submitted February 13, 2008.
Research shows that introduction of feldspar concentrate into the composition of ceramic mixes improves
mullite crystallization, and this promotes an increase in the acid resistance of refractory materials. An increase
in iron oxide content reduces the acid resistance of refractory materials since it does not promote an improve
ment in mullite lattice crystallization.
There has been a considerable amount of work in the
field of studying acid-resistant objects, although the mecha-
nism of acid resistance has not been studied adequately. One
important factor governing the acid resistance of ceramic
materials is their phase composition. Phase composition, tex
ture, morphological features of crystalline phases, mainly de
termine the operating properties of ceramic materials. Nu
merous studies of the structure of acid-resistant materials
shows that the final phases present within them are normally
mullite, quartz, glass, in amounts depending on the original
composition, and haematite (with a content in the original
raw material of Fe
> 3%) [1 – 5].
Recovery and processing of natural raw materials is con
nected with forming a considerable number of different
waste materials. One aspect of solving the problem of the
worsening ecological situation in regions is use of
technogenic raw materials in ceramic materials .
In Russia and Kazakhstan a special position is occupied
by the mining and metallurgical complex whose production
is the main economy and a considerable part of the export of
these countries. In addition, in the majority of nonferrous
metallurgy enterprises of the country there is currently a
marked reduction in the reserve of high quality ores, and
worsening of the mining and geological conditions of devel
oping deposits. Most often there is production using mineral
and raw material sources with a poor useful component con-
tent. In the last 20 – 25 years the content of the main metals
in ores has decreased by a factor of 1.5 – 1.6, and the propor-
tion of ores that are difficult to enrich has increased from 15
to 45% [6, 7]. At the same time, in nonferrous metallurgy en-
terprises an enormous amount of waste materials has been
accumulated, i.e. more than ten billion tons.
Production of ceramic materials is one of the most mate
rial-consuming branches of the national economy, and there
fore rational use of fuel, raw materials and other material re
sources becomes a decisive factor in successful development
under conditions of the economic reform. In this connection
use in ceramic materials of technogenic raw materials ac
quires particular importance. In [8 – 12] a fundamental pos
sibility of demonstrated of using for manufacturing acid-re
sistant materials an argillaceous component of the clay por
tion of gravitation tailings from zircon-ilmenite ores (GZI)
and Chapaev kaolin clay, pyrophyllite as an inert component,
and an associated product of rare-earth metals (feldspar con
centrate, i.e. FSC) as a fuzing agent. Studies have shown that
in production two compositions are optimum: No. 1 is 50%
GZI, 40% pyrophyllite, 10% FSC, and No. 2 is 50% Chapa
ev kaolin clay, 40% pyrophyllite, 10% FSC .
Since in the majority of regions of Kazakhstan, Western
Siberia and Land along the Volga in the Russian Federation
there are no or limited deposits of refractory clays and fuzing
agents that sinter well, a study of GZI for suitability as an ar
Refractories and Industrial Ceramics Vol. 49, No. 6, 2008
1083-4877/08/4906-0422 © 2008 Springer Science+Business Media, Inc.
S. P. Korolev Samara State Aerospace University, Samara, Russia.