• Silica Bricks

Product Description And Parameters

Main Composition:Silica

Application:glass making industry

Capacity:3000 tons per month

Size : As your requirements

silica brick for glass kiln has the characteristics of high purity, high density, high strength and high soft, high refractoriness.
It also has the ability of resistance to acidic and alkalic steam attack with high performance of flushing resistance.

The operating equipment and the operating procedures guarantee manufacture of silica bricks with excellent stability, defined mineralogical composition and high stability under high temperature and pressure stresses. The main areas of use for silica bricks are coke oven plants (oven floor, heating wall, oven roof and the upper regeneration layers), the superstructure of glass melters (and where required also in the upper structure of the re-generator) and in the high temperature areas of hot blast stoves.

In glass industry, it is mainly used to build the doghouse crown, suspended wall of channel, top crown and inlet sealing.

For coke oven–being the partition walls in coke oven carbonization and burning chamber;

Inmetallurgy industry: used as refractories for steel making open hearth regenerator, slag pocket, soaking pit;
Arch crown and other weight bearing areas in ceramic kilns, hot blast furnace and acid open hearth;

To be used to build the checker chamber, chute, combustion chamber, coking chamber and furnace arch in glass melting furnaces.

Refractory Dense Silica Brick 96A for Doghouse Crown of Glass Furnace

Silica brick has good thermal shock resistance above 650℃, so it is mainly used in the continuous operating furnace. However, under 650℃, it has poor thermal shock resistance, so the temperature should be increased slowly during the baking process.
Silica brick has good corrosion resistance to glass liquid. It is the preferred refractory for crown construction of glass melting furnaces, in terms of cost, strength and of defect potential.
Since silica brick is sensitive to the alkali corrosion, its service life is greatly shortened in the oxygen-fuel furnaces where the crown suffers from severe alkali vapor corrosion. Fused cast AZS block and fused cast alumina block are used as alternatives to silica brick in the oxygen-fuel furnaces. However, they are expansive and heavy, which increases the cost and load of the crown. So, high quality silica brick with better corrosion resistance is developed to meet the requirement of the oxygen-fuel furnace and reduce the cost.

Item

BG-94

BG-95

BG-96A

BG-96B

Chemical composition

SiO2

≥94

≥95

≥96

≥96

Fe2O3

≤1.5

≤1.5

≤0.8

≤0.7

Al2O3+TiO2+R2O

≤1.0

≤0.5

≤0.7

Refractoriness ℃

1710

1710

1710

1710

Apparent Porosity%

≤22

≤21

≤21

≤21

Bulk Density g/cm3

≥1.8

≥1.8

≥1.8

≥1.8

True Density,g/cm3

≤2.38

≤2.38

≤2.34

≤2.34

Cold Crushing Strength Mpa

≥24.5

≥29.4

≥35

≥35

0.2Mpa Refractoriness Under Load T0.6℃

≥1630

≥1650

≥1680

≥1680

Permanent Linear Change On Reheating

(%)1500℃X2h

0~+0.3

0~+0.3

0~+0.3

0~+0.3

20-1000℃ Thermal Expansich10-6/℃

1.25

1.25

1.25

1.25

Thermal Conductivity (W/MK) 1000℃

1.74

1.74

1.44

1.44

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