FUSED REFRACTORY OXIDES INCREASING
NONFERROUS METALLURGY UNIT LINING LIFE
V. V. Slovikovskii
and A. V. Gulyaeva
Translated from Novye Ogneupory,No.10,pp.3–8,October, 2016.
Original article submitted April 3, 2016.
Technology is developed for preparing periclase-chromite composition refractories based on fused grains of
increased thermal-shock resistance. Technology is created for preparing periclase composition refractories
based on fused grains exhibiting a high service temperature (up to 1900ºC) and improved thermal shock resis
tance. Refractory material SHS-technology is developed on whose basis fused refractory objects, brickwork
mortars, and torcrete mixes for hot torcreting are created. Refractory materials are turned out on an industrial
scale in OAO Kombinat Magnezit. They are used for the most worn parts of linings such as the tuyere zone in
horizontal converters, the slag belt of ore-roasting furnaces (ORF), in the reaction zone of a Waelz kiln, ORF
outlet assemblies, Kivcet unit arches, and Vanyukov furnaces. Lining life is increased by a factor of 1.5 – 2.5.
Keywords: fused oxides, periclase-chromite, thermal shock resistance, slag resistance, SHS-refractory.
During the last decade in refractory technology consider-
able importance has been given to melting and casting used
for oxide refractories distinguished by stability at high tem-
perature. The main advantage of this technology concerns a
high degree of material homogenization during melting and
preparation after cooling of a dense and strong body with a
structure that may be controlled to a certain extent. Technol
ogy of melting refractories may end with pouring a melt into
a mold and preparation of objects of a prescribed configura
tion, and sometimes followed by machining. It is also possi
ble to prepare fused materials in the form of granules or
blocks that are then crushed, refined, and used for object
manufacture by ceramic technology.
During melting silicates migrate to the skin and a block
(see Fig. 1) is enriched with MgO, and the CaO content var
ies with respect to zones less markedly. A block has a zonal
structure, within which a dense zone of fused directional so
lidification is located at the periphery. The thickness of the
zone depends on resource purity and heat transfer conditions.
Single crystals from it are suitable for preparing heat-resis
tant refractories and powders of electrical engineering
periclase. A zone with cavities as a result of bulk solidifica
tion is located to the center of a block, and is proportion is
30 – 40% of a block. It is more contaminated with readily
melting silicates since during directional solidification there
is migration of ions entering into solid solution from
periclase towards the center of a block. The outer part is rep-
Refractories and Industrial Ceramics Vol. 57, No. 5, January, 2017
1083-4877/17/05705-0439 © 2017 Springer Science+Business Media New York
FGAOU VPO Ural Federal University, Ekaterinburg, Russia.
Fig. 1. Structure of melted and cast block: 1 ) shrinkage pit;
2 ) “mossy” zone; 3 ) porous zone; 4 ) dense zone.