 |
Typical
Product Specification of Indian Refractories - High
Alumina Bricks
Some typical specifications of Indian refractories
commonly used in the furnaces and kilns in steel,
cement, non-ferrous metals and glass industries are
given below. These are illustrative and do not cover the
full range of products and some of the improved items
which have been recently developed.
|
HIGH ALUMINA BRICKS
|
|
CHEMICAL
PROPERTIES |
|
|
|
Al
2 O3 (%) |
98.4
- 99.0
|
85
- 88
|
|
SiO
2 (%) |
0.5
- 0.7
|
8.0
- 10.0
|
|
Fe
2 O3 (%) |
0.05
- 0.07
|
1.0
|
|
PHYSICAL
PROPERTIES |
|
|
|
Hot
Face Temperature (°C) (Max) |
1870
|
1650
|
|
Bulk
Density (gm/cc) |
2.8
- 3.0
|
2.6
- 2.85
|
|
Apparent
porosity (%) |
18
- 23
|
17
- 22
|
|
Cold
Crushing Strength (kg/cm²) |
550
- 650
|
700
- 900
|
|
Modulus
of Rupture (kg/cm²) at room temp. |
180
- 200
|
150
- 175
|
|
Reheat
change (%) (Max) at 1450&°C for 6 hrs. |
±0.1
|
±0.3
|
|
Thermal
conductivity (w/m°K) at 1000°C Hot Face temp. |
3.0
|
4.1
|
|
Spalling
Resistance |
Fair
|
Good
|
|
BAUXITE BASED HIGH ALUMINA
BRICKS
|
|
CHEMICAL
PROPERTIES |
|
|
|
Al
2 O3 (%) (Min) |
70
|
80
|
|
Fe
2 O3 (%) (Max) |
3.0
- 3.5
|
3
|
|
PHYSICAL
PROPERTIES |
|
|
|
Pyrometric
Cone Equivalent (Orton) (Min) |
36
|
37
- 38
|
|
Apparent
porosity (%) (Max) |
23
|
23
|
|
Bulk
Density (gm/cc) (Min) |
2.6
|
2.7
|
|
Cold
Crushing Strength (kg/cm²) (Min) |
400
|
400
- 500
|
|
PLCAR
(%) (Max) at 1600°C for 2 hrs. |
+3
|
+1.5
|
|
Remarks |
High
Alumina bricks resistant to alkali and slag attack, suitable for
burning
zone of Cement rotary klin ladle lining and EAF |
|
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