 |
Typical
Product Specification of Indian Refractories - Silica
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.
|
COKE OVEN SILICA BRICKS (as
per DIN 1089
Part-1)
|
|
|
Regenerator
Oven walls
Oven roof |
Oven walls |
Oven Sole |
|
CHEMICAL
PROPERTIES |
|
|
|
|
|
SiO2
(%) |
m |
>=94.5
|
>=95
|
>=95
|
|
s |
1.0
|
1.0
|
1.0
|
|
Al
2 O3 (%) |
m |
<=2.0
|
<=1.5
|
<=1.5
|
|
s |
0.3
|
0.3
|
0.3
|
|
Fe
2 O3 (%) |
m |
<=1.0
|
<=1.0
|
<=1.0
|
|
s |
0.2
|
0.2
|
0.2
|
|
CaO
(%) |
m |
<=3.0
|
<=3.0
|
<=3.0
|
|
s |
0.35
|
0.35
|
0.35
|
|
Na
2 O+K2O (%) |
m |
<=0.35
|
<=0.35
|
<=0.35
|
|
s |
0.02
|
0.02
|
0.02
|
|
Residual
quartz content |
|
|
|
|
|
Raw
material type A (%) |
m |
As per
mutual agreement
|
|
(coarse
crystalline) |
s |
Max
6.0
|
|
Raw
material type B (%) |
m |
1.5
|
|
|
|
(coarse
crystalline) |
s |
0.5
|
|
|
|
PHYSICAL
PROPERTIES |
|
|
|
|
|
Cold
Crushing Strength (N/mm²) |
m |
>=28
|
>=35
|
>=45
|
|
s |
10
|
10
|
10
|
|
Min |
20
|
25
|
30
|
|
Apparent
porosity (%) |
m |
<=24.5
|
<=22.0
|
<=22.0
|
|
s |
1.3
|
1.3
|
1.3
|
|
Refractoriness
under load (DEFta°C) |
m |
>=1640
|
<=1650
|
<=1650
|
|
s |
25
|
25
|
25
|
|
Creep
in compression 5-25 hrs. (%) |
m |
<=0.12
|
<=0.12
|
0
|
|
s |
0.05
|
0.05
|
0
|
|
Refractoriness
(SK) |
m |
31
|
0
|
0
|
|
s |
1
|
0
|
0
|
|
COKE OVEN SILICA BRICKS (as
per DIN 1089
Part-1)
|
|
|
Regenerator
Oven walls
Oven roof |
Oven walls |
Oven Sole |
|
CHEMICAL
PROPERTIES |
|
|
|
|
|
SiO2
(%) |
m |
>=94.5
|
>=95
|
>=95
|
|
s |
1.0
|
1.0
|
1.0
|
|
Al
2 O3 (%) |
m |
<=2.0
|
<=1.5
|
<=1.5
|
|
s |
0.3
|
0.3
|
0.3
|
|
Fe
2 O3 (%) |
m |
<=1.0
|
<=1.0
|
<=1.0
|
|
s |
0.2
|
0.2
|
0.2
|
|
CaO
(%) |
m |
<=3.0
|
<=3.0
|
<=3.0
|
|
s |
0.35
|
0.35
|
0.35
|
|
Na
2 O+K2O (%) |
m |
<=0.35
|
<=0.35
|
<=0.35
|
|
s |
0.02
|
0.02
|
0.02
|
|
Residual
quartz content |
|
|
|
|
|
Raw
material type A (%) |
m |
As per
mutual agreement
|
|
(coarse
crystalline) |
s |
Max
6.0
|
|
Raw
material type B (%) |
m |
1.5
|
|
|
|
(coarse
crystalline) |
s |
0.5
|
|
|
|
PHYSICAL
PROPERTIES |
|
|
|
|
|
Cold
Crushing Strength (N/mm²) |
m |
>=28
|
>=35
|
>=45
|
|
s |
10
|
10
|
10
|
|
Min |
20
|
25
|
30
|
|
Apparent
porosity (%) |
m |
<=24.5
|
<=22.0
|
<=22.0
|
|
s |
1.3
|
1.3
|
1.3
|
|
Refractoriness
under load (DEFta°C) |
m |
>=1640
|
<=1650
|
<=1650
|
|
s |
25
|
25
|
25
|
|
Creep
in compression 5-25 hrs. (%) |
m |
<=0.12
|
<=0.12
|
0
|
|
s |
0.05
|
0.05
|
0
|
|
Refractoriness
(SK) |
m |
31
|
0
|
0
|
|
s |
1
|
0
|
0
|
|
SILICA BRICKS FOR BLAST
FURNACE STOVES
|
|
CHEMICAL
PROPERTIES |
|
|
SiO
2 (%) (Min) |
95
|
|
Fe
2 O3 (%) (Max) |
1
|
|
Al
2 O3 (%) (Max) |
0.7
|
|
TiO
2 (%) (Max) |
0.2
|
|
CaO
(%) (Max) |
3
|
|
Alkalies
(%) (Max) |
0.2
|
|
Free
quartz (%) (Max) |
|
|
Avg. |
0.75
|
|
Retesting
required if more than |
1
|
|
Absolute |
1.5
|
|
PHYSICAL
PROPERTIES |
|
|
Bulk
Density (kg/m³) (Min) |
1800
|
|
Apparent
porosity (%) (Max) |
21
|
|
Cold
Crushing Strength (N/mm²) (Min) |
30
|
|
Refractoriness
under load (2 kg/cm²) (ta°C) (Min) |
0
|
|
Permanent
linear change (%) (Max) |
Avg.
< 2.0
|
|
Avg.
> -0.2
|
|
Pyrometric
Cone Equivalent (°C) (Min) |
0
|
|
Specific
Gravity (gm/cc) (Max) |
2.34
|
|
(Min) |
2.30
|
|
Creep
(%) (0.2 N/mm²) (Max) at 1500°C for 20-50 hrs. |
0.2
|
|
|
