Silica Insulating Brick

High tridymite content, about 78%~86%. 

Low bulk density.

Good cold crushing strength.

Good thermal insulating effect.

High refractoriness, high working temperature.

Good  thermal stability. 

  Description

Silica insulating brick is made from silica or crystalline quartzite raw materials that contains more than 90% of SiO2. The bulk density of lightweight silica insulating brick is lower than 1.2g/cm3. Combustible materials such as coke, anthracite, saw powder, carbonized rice shell are added into batch material to make lightweight silica insulating brick, as they will burn during high temperature sintering and  form porous structure. Another method to make lightweight silica brick is gas foaming method. mineralizers( CaO, Fe2O3) are use to contribute to the transformation of quartz. During the sintering of lightweight silica insulating bricks, strong oxidizing flame should be maintained to ensure the complete combustion of combustible materials.

  Technical Data:

Items

QG-1.0

QG-1.1

QG-1.15

QG-1.2

SiO2  %

≥91

≥91

≥91

≥91

Bulk Density  g/cm3

≥1.00

≥1.10

≥1.15

≥1.20

Cold Crushing Strength  MPa

≥2.0

≥3.0

≥5.0

≥5.0

0.1Mpa Refractoriness Under Load   °C

≥1400

≥1420

≥1500

≥1520

Reheating Linear Change (%) 1450°C×2h

0~+0.5

0~+0.5

0~+0.5

0~+0.5

20-1000°C Thermal Expansion Coefficient ×10-6℃-1

1.3

1.3

1.3

1.3

Thermal Conductivity  (W/(m·K)  350°C±10℃

≤0.55

≤0.6

≤0.65

≤0.7

 

  Application:

Lightweight Silica Insulating Bricks Applications

Lightweight silica insulating bricks can be long term used at high temperature(1500~1550℃) condition, especially suitable for the insulating of large size high temperature hot blast furnace silica brick working lining, as well as the insulating of glass kiln silica brickwork. Lightweight silica insulating brick should not contact with molten slag. High quality silica insulating brick is mainly used rolling steel heating furnace top and silicate industrial furnace top, etc, it can directly contact with flame. Ordinary silica insulating brick is mainly used as insulating lining of  industrial kilns and furnaces.   

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