HEAT-INSULATING PROPERTIES OF REFRACTORY MATERIALS
MADE WITH THE USE OF ARTIFICIAL CERAMIC BINDERS
N. A. Peretokina,
V. A. Doroganov,
V. A. Grudina,
and A. N. Pogikyan
Translated from Novye Ogneupory, No. 4, pp. 34 – 37, April, 2016.
Original article submitted July 13, 2015.
It is shown that it possible to produce heat-insulating and heat-insulating/structural refractories based on artifi
cial ceramic binders made from thermally activated refractory clays of different compositions. The slag-alkali
binder used in the new materials undergoes strengthening by a unique mechanism. An analysis is made of the
granulometric composition of the slag after comminution for different lengths of time and its main
granulometric characteristics are determined. The main properties and microstructure of the new heat-insulat
ing materials are studied.
Keywords: thermally activated clay, artificial ceramic binder, foam method, density, strength, composite
binder, coefficient of structural quality, microstructure.
There are a number of heat-insulating refractories whose
manufacturing technology and properties are characterized
by serious deficiencies . The production of refractory
composites based on artificial ceramic binder (ACB) suspen-
sions is a promising recent development. The main advan-
tages of these materials are the low degree of microporosity
between the partitions and their high strength (which is in
crease by heat treatment), the environmental cleanliness of
the entire production process, and the possibility using inex
pensive natural and technogenic raw materials [2 – 5].
A study was made of the feasibility of making heat-insu
lating materials based on an artificial ceramic binder pre
pared with the use of thermally activated refractory kaolinite
clays from the Krasnaya Yaruga deposit (clay KG) and
Bolshaya Korpoka deposit (clays BKG and BKP).
Briquettes were formed from the clays and subjected to
heat treatment at 1000°C with a 30-min hold at the highest
temperature. The heat treatment was accompanied by phase
transformations in the material (due to the polymorphism of
quartz and the presence of kaolinite and hydromica). The
phase transformations help activate the minerals and reduce
the density of their crystalline lattices. The system was sub
jected to abrupt cooling to also help activate the minerals
The activated material was ground in a 100-liter mill in the
alkaline pH range, the grinding operation being carried out
by a method that involves adding the material to the mill in
stages . After discharge, the suspension was stabilized by
gravitational mixing for 5–7h.Theproperties of the ACBs
that were made are shown in Table 1.
The heat-insulating material was obtained by mixing the
mineral component (ACB) and a slag-alkali binder with a
previously prepared foam, since the highest degree of poros
ity (85 – 90%) is obtained by the foam method of production
. A 3% solution of foaming agent TEAS was used in the
study. The content of slag-alkali binder in the mix ranged
from 5 to 15% (Table 2). This binder was obtained by using
sodium silicate and slag obtained from the Seversky Pipe
The properties of the slag-alkali binder are appreciably
influenced by the activity of the slag, which determines
Refractories and Industrial Ceramics Vol. 57, No. 2, July, 2016
1083-4877/16/05702-0189 © 2016 Springer Science+Business Media New York
Belgorod State Technological University im. V. G. Shukhova,
TABLE 1. Characteristics of ACBs Made from Thermally Acti
of the solid phase C
Content of particles
<0.1 mm, %
KG 22 2.05 0.63 0.57
BKG 28 1.81 0.49 —
BKP 28 1.95 0.57 0.68
* Their rheological behavior is thixotropic in character.