BASED ON HIGH-ALUMINA CHAMOTTE GRADE RASC
I. D. Kashcheev,
M. A. Bayandina,
and T. V. Bayandina
Translated from Novye Ogneupory, No. 5, pp. 34 – 36, May, 2016.
Original article submitted March 2, 2016.
A simplex-lattice method is used for planning an experiment for sorting the grain size composition of
high-alumina chamotte grade RASC in order to prepare mullite material. Optimum chamotte grain size com
position is established proving an improvement in operating properties.
Keywords: chamotte, kaolin, grain size composition, simplex-lattice method for planning an experiment.
Development of contemporary metallurgy and many
other branches of industry is accompanied by intensification
of heating processes. Ever higher specifications are laid
down for refractory materials with respect to resistance to
melts, mechanical loads, and action of various gas atmo-
spheres at high temperature. In the majority of cases these
specifications are satisfied by high-alumina materials. The
main areas of development and production of high-alumina
material in the XXIst century should be creation of wear-re-
sistant materials due to improvement of their operating prop-
erties [1, 2]. This may be achieved by using high quality nat
ural raw materials and correct selection of charge grain size
In 2004 the company Russian Aluminum signed an
agreement with Guyana (South America) for joint develop
ment of a deposit of low-iron bauxite of the gibbsite type.
Therefore as a starting raw material for preparing mullite-co
rundum material it is possible to use bauxite from the Guy-
ana deposit. High-alumina material is normally obtained by
multichamotte technology. A discrete grain size is used with
combined milling of chamotte and clay. In practice the fol-
lowing charge compositions are used: 60% chamotte fraction
3 – 0.5 mm and 40% mixture of combined milling of clay
(25%) and chamotte (75%). The overall clay content of a
charge is about 10% . For multichamotte objects, within
which there is little clay, there is a high value of chamotte
grain lay-up density. Consequently, high operating property
indices may be achieved with correct selection of chamotte
grain size composition.
Results are reflected in the present work of selection of
grain size composition of high-alumina chamotte grade
RASC by a simplex grid method for obtaining operating
properties of mullite-corundum material. The starting raw
materials for preparing mullite-corundum material used were
high-alumina chamotte obtained from Guyana deposit baux
ite (chamotte grade RASC) and enriched kaolin from the
Zhuravlinyi Log deposit [4, 5]. The chemical composition of
the starting materials is given in Table 1. Specimens 40 mm
Refractories and Industrial Ceramics Vol. 57, No. 3, September, 2016
1083-4877/16/05703-0258 © 2016 Springer Science+Business Media New York
FGAOU VPO Ural Federal University, Ekaterinburg, Russia.
FGBOU VPO South-Ural State University (NIU), Satka, Chelya
binsk Region, Russia.
TABLE 1. Starting Material Chemical Composition, wt.%
MgO CaO Fe
Chamotte fraction, mm:
3 – 1 85.10 9.60 0.18 0.08 1.26 3.70 0.02 0.06 —
<1 80.20 12.80 0.38 0.22 1.87 4.21 0.05 0.15 —
Kaolin 35.99 48.20 1.23 0.36 0.57 0.38 0.43 0.22 12.56