RESEARCH IN THE AREA OF PREPARING MATERIALS
BASED ON FUZED QUARTZ HCBS.
PART 11. TESTS FOR IMPLEMENTING NEW UNFIRED
QUARTZ REFRACTORY TECHNOLOGY
Yu. E. Pivinskii,
P. V. Dyakin,
A. D. Buravov,
A. M. Gorokhovskii,
L. A. Karpets,
N. V. Gusev,
V. I. Khabarova,
and D. A. Karataev
Translated from Novye Ogneupory, No. 7, pp. 48 – 53, July 2016.
Original article submitted March 24, 2016.
Tests are carried out for implementing new unfired technology applied to manufacturing quartz steel-pouring
refractories, rolls for furnaces annealing dynamo steel and vibration molding ceramic concrete blocks. Protec
tion tubes prepared by this technology for steel pouring successfully pass plant tests with pouring steels both
with a standard and increased manganese content. Their life is comparable with similar objects prepared by
Keywords: fuzed quartz, HCBS, cristobalite, silicate lump, steel-pouring refractories, steel pouring.
In articles [1 – 3] of the present series of publications
questions have been considered of the effect of alkali addi-
tions in the form of silicate lump powder on sintering and
cristobalitization of specimens based on fuzed quartz HCBS.
The importance of this research is directed by the signifi
cance for developing new versions of unfired quartz refrac
tory technology. This technology provides object strengthen
ing by introducing into the original molding compositions al
kali additions in the form of silicate powder.
PREVIOUS ANALOGS AND STRENGTHENING
The first tests for unfired technology of quartz
refractories were conducted in the 1970s [4 – 8]. The practi
cal base for developing this technology was observation in
those years of the effect of sharp strengthening of molded
(predominantly silica-containing) ceramic or ceramic con-
crete semifinished product with water (at certain pH) or heat-
ing and moisture treatment [5, 6]. These ceramic and refrac-
tory materials were prepared directly by strengthening chem-
ically active contact bonds (UKhAKS-materials) [9, 10]. The
mechanism of this strengthening is explained by insignifi
cant dissolution of solid phase and subsequent condensation
(regeneration) of solution during drying at the contact sur
faces of particles (“cold sintering”) and it proceeds without
changing volume and porosity of the system [9 – 11].
In the first stage of production approval an idea in accor
dance with an invention  by the Podol’sk Refractory Ob
ject Plant (PZOI) test specimens were prepared and tested
quite successfully in NLMK for steel-pouring nozzles
strengthened by treatment of dried objects in water glass so
lution (density 1.02 – 1.05 g/cm
) followed by drying. In the
next stage of development of this technology in order to im
prove mechanical strength and refractory life in service hy
drothermal treatment was implemented (8 atm) of previously
treated slip-cast semifinished product in alkali solution
[8, 12]. By this technology in PZOI test batches of objects
were prepared and tested in NLMK. According to the con
clusions in an article  “the life of unfired strong hydro
thermally treated quartz nozzles for steel pouring was no
worse than for fired objects. In addition, in contact with cor
Refractories and Industrial Ceramics Vol. 57, No. 4, November, 2016
1083-4877/16/05704-0373 © 2016 Springer Science+Business Media New York
Part 1 of the article was published in Novye Ogneupory No. 7
(2014), parts 2 – 7 in Nos. 1, 3, 4, 6, 7, and 9 (2015), and parts
8—10 in Nos. 1, 3 and 5 (2016).
OOO NVF Kerambet-Ogneupor, St. Petersburg, Russia.
FGBOU VPO St. Petersburg State Technological University
(Technical University), St. Petersburg, Russia.
OAO Dinur, Pervoural’sk, Sverdlovsk Region, Russia.