Silica Bricks Used in Industrial Kilns and Furnaces
1. Coke Furnace Silica Bricks
Coke furnaces silica bricks are made by silica material which’s main crystalline phase is tridymite and are used for the masonry of furnace body. About 6o~70% of refractory material used in modern coke furnaces are Silica bricks. Coke furnace silica bricks are mainly used for the masonry of regenerator chamber, access ramp, combustion chamber, carbonization chamber and furnace top, etc.
Coke Furnace Silica Bricks Characteristics
High rupture under load: coke furnace silica bricks should endure high temperature environment and the locomotor load of coal car working on furnace top, and should not deformed in long term service time, so high rupture under load is required.
High thermal conductivity: The coke is produced in the carbonization chamber by the heat conducted by combustion chamber wall, so the silica bricks used for the masonry of combustion chamber should have high thermal conductivity.
Good thermal shock resistance: Coke furnace need to periodically load coal and unload coke, the temperature change of combustion chamber wall is drastic, so coke furnace silica bricks should have good thermal shock resistance.
Stable high temperature volume.
Coke Furnace Silica Bricks Parameters
Item
Furnace bottom and wall
Other parts
SiO2% ≥
94
94
RUL （0.2MPa）℃ ≥
1650
1650
Apparent porosity %
22
24
Cold compression strength MPa ≥
30
25
True Density g/cm3 ≤
2.34
2.35
Permanent liner change (1450℃, 2h) %
0~+0.2
0~+0.2
Linear expansion (1000℃) % ≤
1.28
1.30
2.Hot Blast Furnace Silica Brick
Hot blast furnace hot air temperature is increasing in recent years, when air temperature is higher than 1200℃, traditional high alumina refractory bricks can’t meet the working environment, so silica bricks which have low creep, high strength and good thermal shock resistance are popularly used in large scale hot blast furnace top, separation wall regenerator wall upper parts.
Hot blast furnace silica bricks physicochemical index
Item
Vault and furnace wall brick
Checker brick
SiO2% ≥
95
95
Creep rate(0.2MPa, 1550℃, 50h) %
0.8
0.8
Apparent porosity %
22
23
Cold compression strength MPa ≥
35
30
True Density g/cm3 ≤
2.35
2.35
Linear expansion (1000℃) % ≤
1.26
1.26
3.Glass Kiln High Class Silica Bricks
Silica bricks used in glass kiln features high silica content, low molten index and so on, mainly used in breast wall, hanging wall, upper part of furnace and regenerator, etc.
Glass kiln high class silica bricks parameters
Item
XSB-96
ZSB-96
DSB-96
Unit Weight/kg
≤15
15~25
25~40
Fe2O3 % ≤
0.9
0.9
1.0
SiO2% ≥
96
96
96
RUL （0.2MPa）℃ ≥
1680
1680
1670
Apparent porosity %
22
23
24
Cold compression strength MPa ≥
35
30
30
True Density g/cm3 ≤
2.34
2.34
2.35
Permanent liner change (1450℃, 2h) % ≤
0.3
0.3
0.3
Melt Index %
0.5
0.5
0.6
RS Kiln Refractory Main Advantages and Qualifications
Quality Assurance: RS engineers and technicians strictly complies with customers’ quality standards to serve best quality refractory products.
Cost effectiveness: Give customers the most reasonable and professional solutions for their requirements to reduce cost of both construction and transportation.
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