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Silica Brick

1.Made by quartz stone materials;
2The content of SiO2 is above 93%;the more SiO2,the higher refractoriness.
3.Al2O3,TiO2 etc impurity amount is under 2%.
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Technical data sheet

General silica brick:used for coke oven, glass smelting kiln furnace,steel furnace etc .

Item

GZ-96

GZ-95

GZ-94

GZ-93

SiO2 %

≥96

≥95

≥94

≥93

Fe2O3 %

≤1.0

≤1.2

≤1.4

≤1.6

Refractoriness °C

≥1710

≥1710

≥1710

≥1690

Apparent porosity %

≤22

≤22

≤23

≤25

Cold crushing strength Mpa

 ≥29.4

 ≥29.4

 ≥24.5

 ≥19.6

Refractoriness under load, 0.2MPa, °C

≥1660

≥1650

≥1640

≥1620

True density g/cm3

≤2.34

≤2.37

≤2.38

≤2.39

 

Silica brick for Hot-blast stove

Item

Dome wall brick

Checker brick

SiO2 %

≥95

≥95

Cold crushing strength Mpa

≥35

≥30

Apparent porosity %

≤22

≤23

Creep rate(0.2MPa,1550°C,50h)%

≤0.8

≤0.8

True density g/cm3

≤2.35

≤2.35

Thermal expansion(1000 °C)%

≤1.26

≤1.26

 

Silica brick for coke oven

Item

Furnace bottom,Furnace wall

Other

SiO2 %

≥94

≥94

Cold crushing strength Mpa

≥30

≥25

Apparent porosity %

≤22

≤24

Refractoriness under load, 0.2MPa,°C 

≥1650

≥1650

Permanent linear Change 1450 °C,2h %

≤0-+0.2

≤0-+0.2

True density g/cm3

≤2.34

≤2.35

Thermal expansion(1000 °C) %

≤1.28

≤1.30

 

Silica brick for Glass kiln

Item

XBG-96

ZBG-96

DBG-96

SiO2 %

≥96

≥96

≥96

Fe2O3 %

≤0.9

≤0.9

≤1.0

Melt index %

0.5

0.5

0.6

Apparent porosity %

≤22

≤23

≤24

Refractoriness under load, 0.2MPa,°C

≥1680

≥1680

≥1670

Reheating Linear Change(1450 °C,2h) %

≤0.3

≤0.3

≤0.3

True density g/cm3

≤2.34

≤2.34

≤2.35

Cold crushing strength Mpa

≥35

≥30

≥30

Features

1.Good acid erosion resistance.

2.Refractoriness 1690-1730℃.

3.Higher refractoriness under load,above 1620-1680℃.

4.Poor Thermal shock resistance,should not be used for the zone which temperature has rapid change.

5.Poor Volume stability at high temperature,must set aside appropriate expansion joint when laying brick.

6.Generally True density is changed between 2.33-2.42g/cm3,the smaller, the better.

Applications

1.Coke oven,blast furnace hot blast furnace,copper smelting furnace,glass smelting kiln furnace,electric furnace roof.

2.Mainly used in the construction of regenerative chamber wall,chimney flue,combustion chamber, coking chamber, furnace roof etc. parts of the coke ovens.

3.Also used in hot blast stove/furnace of dome,furnace wall and checker brick.

4.Steel open hearth of regenerative chamber and sediment chamber,soaking furnace, glass melting furnace and ceramic firing kiln and kiln of the vault etc.