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More
about refractories
What
are refractories?
"Refractory"
items according to any standard English dictionary are materials which
are hard to work with, and are especially resistant to heat and
pressure.
In practical terms, refractories are products used for high
temperature insulation and erosion/corrosion and are made mainly from
non-metallic
minerals. They are so processed that they become resistant to the
corrosive
and erosive action of hot gases, liquids and solids at high
temperatures,
in various types of kilns and furnaces.
Basalt
is a naturally occurring siliceous refractory product. It was
formed
many, many years ago - and is still being formed in lava flows from
volcanic
eruptions - under the natural geological forces of heat and pressure.
Modern
refractory production is largely a replication of this process of
forming
naturally-occurring (or synthetic) non-metallic mineral oxides
(and
some non-oxides like carbides or nitrides) under the bonding conditions
of high heat and pressure. Of course with technological progress,
alternative
bonding techniques, such as with chemicals, cements, resins, etc. have
also developed.
Because
refractory products are so resistant to heat, erosion and corrosion,
they
are typically used in any process involving heat and corrosion such as
in kilns and furnaces. According to the main chemical component, i.e.
fire clay,
or magnesia, or zirconia, etc. they are commonly known as
alumino-silicate
or acid refractories, basic refractories, and neutral refractory
products.
In
physical
characteristics, refractories typically have relatively high bulk
density,
high softening point (or Pyrometric Cone Equivalent), high crushing
strength.
They are produced as standard bricks, or as shapes (including
hollow-wares)
or as granular or unshaped or monolithic products.
The
principal applications of refractories are in iron and steel
industries,
cement, glass, non-ferrous metals, petro-chemicals and fertiliser
industry,
chemicals, ceramics and even thermal power stations and incinerators.
The
development and application of refractories for various industries,
testing
procedures of properties and so on are covered in the English language,
by a number of well-known technical journals, such as The Bulletin of
the
American Ceramic Society, Taikubutsu Overseas, Interceram, Ceramic
News,
Refractories Applications, IRMA Journal, Transaction of the Indian
Ceramic
Society, Metal News, etc.
Milestones
in refractories development in India
1874
Fire clay Bricks
1941
Magnesite Bricks
1949
Coke Oven Silica Bricks
1955
Sillimanite Blocks for Glass Industries
1960
Bauxite based High Alumina Bricks for Steel & Cement Industries
1960
Mullite Bricks for Glass Industries
1969
High Grog Fire clay Bricks for Steel Ladles
1977
AZS Electrocast Blocks
1983
Magnesia Carbon Refractories
1983
Magnesia Slide Gate Plates
1984
High Alumina Slide Gate Plates
1985
Low Cement Castables/Monolithics
1985
Ceramic Fibres
1985
High Alumina Bauxite based Ladle Refractories
1986
BRN 62 Blast Furnace Hearth Blocks
1986
Bubble Alumina based Insulating Blocks
1988
Dense Silica Shapes for Tall Coke Ovens
1990
Direct Bonded Mag-Chrome Bricks
1990
Unidirectional Gas Purging Elements
1990
Alumina Carbon Torpedo Ladle Bricks
1990
Slide Gate Refractories
1991
Dense Silica Shapes for Blast Furnace Stoves
1993
Alumina Carbon Continuous Casting Refractories
1993
Mullite Bricks for Blast Furnace and Stoves
1993
Dry Basic Ramming Mass for Furnaces
1993
Gunning materials for Converters
1993
Spraying Mass for Tundish
1994
Ultra Low Cement Castables/Monolithics
1994
Pitch-Bonded Tempered Dolomite Bricks
1994
Cordierite and Silicon Carbide based Kiln Furniture
1995
Spinel based Ladle Monolithic Lining
1995
Alumina Carbon Silicon Carbide Blast Furnace Trough Mass
1998
Magnesia Alumina Zirconia Bricks for Cement Rotary Kilns
1998
Alumina Zirconia Slide Gate and CC Refractories
1998
Pumpable Refractories for Petrochemical Industries
Further
reading:
1.
"Handbook on Refractories"; by D.N. Nandi; Published by Tata
McGraw-Hill Publishing Co. Ltd., N. Delhi, India.
2.
"Hand Book of Ceramics" Vol.1 - 4; Edited by S. Kumar; Published by
Kumar & Associates, Calcutta, India.
3.
"Modern Refractory Practice"; Published by Harbison-Walker
Refractories, Pittsburgh, USA.
4.
"Refractories Handbook"; Published by The Technical Association of
Refractories, Japan.
5.
"Pneumatic Steelmaking Vol.3 Refractories"; Edited by Michel A. Rigaud
and Richard A. Landy; Published by Iron and Steel Society, Warrendale,
USA.
6.
"Pocket Manual Refractory Materials"; Edited by Gerald Routschka;
Published by Vulkan-Verlag, Essen, Germany.
7.
"Refractories Handbook"; Edited by Charles A. Schacht; Published by
Schacht Consulting Services, Penn. USA, 2004.
8.
"Handbook of Thermoprocessing Technologies"; Edited by Axel von Starck,
Alfred Muhlbauer, Carl Kramer; Published by Vulkan-Verlag, Essen,
Germany.
9.
"Refractories Engineering - Materials - Design - Construction";
Published by Vulkan-Verlag, Essen, Germany.
10.
"Monolithic Refractories - A Comprehensive Handbook"; Subrata Banerjee;
Published by The American Ceramic Society & World Scientific
Publishing Co. Pte. Ltd.
11.
Technical pre-prints of IREFCON 1994, 1996, 1998, 2000, 2002.
12.
Technical volumes of UNITECR 1993, 1995, 1997, 1999, 2001, 2003.
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© 2006-07, Indian Refractory Makers Association
5
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