Silica Brick - China Refractory Brick & Castable Manufacturer

Silica Brick

Low bulk density

Low thermal conductivity

High apparent porosity

Good thermal shock resistance

Great high temperature mechanical strength

High temperature stable volume change

Strong acid slag erosion resistance

Application: Silica refractory Brick can be widely used to build all kinds of refractory linings for kilns and furnaces.

Technical Specification

Item		BG-94	BG-95	BG-96A	BG-97B
Chemical Composition %	SiO2	≥94	≥95	≥96	≥96
	Fe2O3	≤1.5	≤1.5	≤0.8	≤0.7
	Al2O3+2(K2O+Na2O)		≤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	≥1.87	≥1.8
True Density g/cm³		≤2.38	≤2.38	≤2.34	≤2.34
Cold Crushing Strength Mpa		≥24.5	≥29.4	≥35	≥35
Refractoriness Under Load (0.2MPa)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
Thermal Conductivity W/m.k 1000℃		1.74	1.74	1.44	1.44
20-1000℃ Thermal Expansion 10-6/℃		1.25	1.25	1.25	1.25

Brief Description

Silica Refractory/Fire Bricks adopt silica as the raw material and lime milk, iron-phosphorus and sulfite lye as the binding agent and mineralizer, are manufactured through firing in the high temperature and go through strong chemical and mechanical erosion. Silica Brick is a kind of acid refractory with over 93% SiO2 content and 2.35g/cm3 true density, which has various features of low volume expansion, excellent high-temperature strength, strong acid slag erosion resistance, And the refractoriness is 1690~1710°C,RUL is beyond 1620°C.

Advantages

Silicon oxide is above 95%

Good acid erosion resistance

High softening point with temperature

No shrink in burn repeatedly

Temperature of refractoriness under load is above 1650º C

Great high temperature mechanical strength

High temperature stable volume change

Good thermal shock resistance property

$silica refractory brick 02$

$silica refractory brick 01$

Application

Mainly used for coke oven of coking chamber and combustion chamber partition, steel open hearth of regenerative chamber and sediment chamber, soaking furnace, glass furnace, refractory silica brick materials and ceramic firing kiln and kiln of vault and other supporting parts. Also used in hot blast stove of high temperature bearing parts and acid open hearth furnace roof.

Mainly used in the construction of regenerative chamber, chute, combustion chamber, coking chamber, furnace roof etc.

parts of the coke ovens and Silica Brick For Glass Kiln.

Manufacturing Process

1.Silica bricks for sale adopts SiO2 rock as the raw materials and require less than 2% Al2O3, TiO2 and alkali metal oxide content. Its manufacturing process is similar to ceramics.
2.Silica brick properties have a close relation with crystal type transform of SiO2 in the process. True specific gravity is an important quality index, which should below 2.38. Less true specific gravity means the more quantity of tridymite and cristobalite and less quantity of residual quartz, which as a result of low residual linear expansion and low reduction in strength.
3.There are more SiO2 content in silica as the raw materials in the manufacturing process of Silica Bricks, there are higher refractoriness. The most harmful impurities are Al2O3, K2O, Na2O and etc. which badly reduce the products’ refractoriness.
4.Choose the silica with over 96% content mixed mineralizer such as iron scrap and lime milk, and binding agent like molasses and lignosulfite through process of mulling, molding, drying and sintering and etc to manufacture Silica Bricks.

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