$Refractory Bricks$

Application Of Fused Casting AZS Brick For Different Parts of Glass Furnace

Apr 01,2017

The entire furnace tank from melting tank, cooling tank until the molding part are all in contact with the glass liquid. The temperatures change from 1200 to 1600; during the whole process when the qualified glass is finished producing from material melting, and the glass liquid is in the convection state. So different parts of glass furnace need different refractory bricks.

AZS brick

1. sidewall brick: sidewall is mainly adopted fused cast AZS brick, and recently years fused cast ; alumina is used in sidewall.
2. tank bottom brick: The condition of the bottom brick is that the glass liquid temperature is low and the flow is weak. The tank bottom is now using the multi-layer compound bottom structure, usually the ground tiles use clay brick, then zircon sand or fused zirconia corundum ramming material are adopted above the clay bricks, the paving bricks adopt fused cast AZS brick.
3. doghouse brick: doghouse is usually serious damaged as it is influenced by the erosion of powder and glass liquid, wear of material layer, and flame. Especially the corner of doghouse, so the corner brick generally adopts fused cast AZS brick 41#. Except for the corner bricks, other parts can use PX casting fused cast AZS brick 33#.
4. neck brick: the corner of neck adopts WS fused cast AZS brick 41# which can strengthen the ability to resist erosion. The short neck crown and the neck part adopt high quality silica bricks.
5. cooling section: the temperature of glass liquid is lower than melting section, so the erosion is relatively lower, so fused cast AZS brick 33# can be used in this part.
6. channel brick: usually adopt fused cast AZS brick 33# or fused cast alumina brick.

7. regenerator chamber: top crown of regenerator usually adopts fused cast AZS brick, direct bonded magnesia brick or silica brick. The top layers of side wall and partition wall use magnesia brick, middle layers use magnesia brick or low porosity clay brick, and bottom layers adopt low porosity clay brick.

Physical chemical index:

Specification of AZS brick			AZS 33	AZS 36	AZS 41
Chemical analysis		Al2O3	Remain	Remain	Remain
		ZrO2	32-34%	35-37%	40-42%
		SiO2	Less than 16.0%	Less than 14.0%	Less than 13.0%
		Na2O	Less than 1.5%	Less than 1.6%	Less than 1.3%
		Fe2O3+TiO2+CaO+MgO+Na2O+K2O+B2O3	Less than 2.5%	Less than 2.5%	Less than 2.5%
Bulk density (dense part)			3.85g/cm 3	3.95g/cm 3	4.0g/cm 3
Apparent porosity (dense part)			Less than 2.0.%	Less than 1.5.%	Less than 1.3.%
Anti-corrosion rate of glass liquid (soda-lime glass, 1500 Celsius 36h)			Less than 1.6mm/24h	Less than 1.5mm/24h	Less than 1.3mm/24h
Bubbling tendency (soda-lime glass, 1300 Celsius 10h)			Less than 2.0%	Less than 1.5%	Less than 1.0%
Exudation temperature of glass phase			More than 1400 Celsius	More than 1400 Celsius	More than 1400 Celsius
Volume weight	Normal casting and tilting casting (RC or TC)		3.4g/cm 3	3.45g/cm 3	3.55g/cm 3
	End casting (EC)		3.6g/cm 3	3.7g/cm 3	3.8g/cm 3
	Void free casting (VF)		3.8g/cm 3	3.9g/cm 3	3.95g/cm 3

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