Silica Refractory Brick

Description

Silica brick is an acidic refractory brick, usually containing more than 93% silica, and also contains a small amount of impurities such as alumina, calcium oxide, and iron oxide.

Silica bricks are divided into four types according to their use: general silica bricks, silica bricks for glass kilns, silica bricks for coke ovens, and silica bricks for hot blast furnaces.

Specification

Specification of Normal Silica Refractory Brick

Items	Properties
	GZ-94
ω(SiO2) / %	≥94
ω(Fe2O3) / %	≤1.4
Open Porosity / %	≤24
Density / (g/cm3)	≤2.35
CCS / MPa	≥30
0.2 MPa R.U.L / ℃	≥1 650

Specifications of Silica Bricks for Glass Kiln

Items		Grades
		BG – 96a	BG – 96b	BG – 95
ω(SiO2) / %	μ0	≥96	≥96	≥95
ω(Fe2O3) / %	μ0	≤0.6	≤0.8	≤1.0
Melt index / %	μ0	≤0.5	≤0.7	——
Open Porosity / %	μ0	≤21	≤22
Density / (g/cm3)	μ0	2.34
CCS / MPa	μ0	≥40	≥35	≥30
	Xmin	30	25	20
0.2 MPa R.U.L  / ℃	μ0	≥1680	≥1670	≥1670
HPLC ( 1450℃×2h ) / %	Xmin ~ Xmax	0 ~ 0.2
Residual Quartz / %	μ0	≤3

Specifications of Silica Bricks for Coking Furnace

Items		Properties
		JG-94
		Bottom	Lining	Other
ω(SiO2) / %	μ0	≥94.5		≥94.0
ω(Al2O3) / %	μ0	≤1.2		≤1.5
ω(Fe2O3) / %	μ0	≤1.2		≤1.5
ω(CaO) / %	μ0	≤3.0		≤3.0
ω(Na2O+K2O) / %	μ0	≤0.35		≤0.35
Open Porosity / %	μ0	≤22		≤24
CCS / MPa	μ0	≥40	≥35	≥28
	Xmin	30	25	20
0.2 MPa R.U.L  / ℃	μ0	≥ 1 650
Density / (g/cm3)	μ0	≤2.33		≤2.34
Residual Quartz / %	μ0	≤1.5
HPLC ( 1450℃×2h ) / %	Xmin ~ Xmax	0 ~ 0.2
CTE / %	μ0	≤1.28		≤1.30

Specifications of Silica Bricks for Hot Blast Furnace

Items		Properties
		RG-95
		Vault, furnace wall bricks	Checkered bricks
ω(SiO2) / %	μ0	≥95
ω(Al2O3) / %	μ0	≤1.0
ω(Fe2O3) / %	μ0	≤1.2
Open Porosity / %	μ0	≤22	≤24
Density / (g/cm3)	μ0	≤2.33	≤2.34
CCS / MPa	μ0	≥40	≥30
	Xmin	25	25
0.2 MPa R.U.L  / ℃	μ0	≥1650
Residual Quartz / %	μ0	≤1.5
0.2 MPa Creep Rate(1550℃) 0h ~ 50h / %	μ0	≤0.8
CTE(1000℃) / %	μ0	≤1.26

Applications

Silica bricks are acidic refractory materials and play a key role in many high-temperature industrial:

In the metallurgical industry, silica bricks are often used in the carbonization chamber and combustion chamber of the coke oven, as well as the belly of the blast furnace, because of their high temperatures and slag erosion resistance.

In the glass industry, silica bricks are also used in small furnace and the regenerator of the glass melting furnace to ensure the stable operation of glass production.

Silica bricks are also used in ceramic kilns, because of their refractory and heat insulating properties to extend the service life of the equipment and help various industries to produce efficiently.