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Profile of Fire clay bricks

Le 25 février 2016, 08:43 dans Humeurs 0

Fire clay bricks are sticky soil products which refer to Al2O3 containing 30%~40% aluminum silicate material. The main mineral composition of fire clay 

 

bricks are kaolinite(Al2O3•2SiO2•2H2O) and 6%~7% impurities(oxide of potassium, sodium, calcium, titanium and iron). Fire clay bricks adopt 50% soft 

 

clay and 50% hard clay clinker, ingredient by a certain size, and sinter under high temperature of 1300~1400℃ after forming and drying. The sintering 

 

process is mainly the process of decomposition of kaolinite which continuously dehydrates to mullite(3Al2O3•2SiO2). SiO2 and Al2O3 form eutectic low 

 

melting point of silicate with impurities in the process of sintering and surround the mullite crystal around.

 

Fire clay bricks are the weak acid refractory products which can resist acid melting slag and the erosion of acid gas, good thermal property and resist 

 

rapid heat and cold. The refractoriness of fire clay bricks is roughly the same with silica bricks which are up to 1690~1730℃, however, refractoriness 

 

under load of fire clay bricks is 200℃ lower than silica bricks. Duo to the low refractoriness under load, fire clay bricks will shrink at high temperature 

 

which lead to the lower thermal property and lower mechanical strength than silica brick, so fire clay bricks are only used in the secondary parts of coke 

 

oven, such as regenerator seal wall, small flue lining bricks and regenerator, door lining brick, roof and riser lining brick.

 

As the clay brick contains not only high refractoriness mullite crystal, but also amorphous glass phase with nearly half of the low melting point. Among the 

 

temperature of 0~1000℃, the volume of fire clay bricks expand with temperature increasing, and the linear expansion ratio is 0.6%~0.7%.  However, 

 

when the temperature reaches 1200℃, the volume will shrink from the maximum with the temperature increasing.

Zhengzhou Sunrise Refractory Co., Ltd. is mainly engaged in the research and development of refractory products. 

Fused Cast AZS Block Used In Different Parts Of Glass Furnace

Le 19 février 2016, 10:08 dans Humeurs 0

 

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.

 

A. sidewall brick: sidewall is mainly adopted fused cast AZS block, and recently years fused cast α-β alumina is used in sidewall.

 

B. 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 300mm clay brick, then 25mm zircon sand or fused zirconia corundum ramming material are adopted above the clay bricks, the paving bricks adopt 75mm fused cast AZS block.

 

C. 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 block 41#. Except for the corner bricks, other parts can use PX casting fused cast AZS block 33#.

 

D. neck brick: the corner of neck adopts WS fused cast AZS block 41# which can strengthen the ability to resist erosion. The short neck crown and the neck part adopt high quality silica bricks. 

 

E. cooling section: the temperature of glass liquid is lower than melting section, so the erosion is relatively lower, so fused cast AZS block 33# can be used in this part.

 

F. channel brick: usually adopt fused cast AZS block 33# or fused cast alumina block α-Al2O3.

 

G. regenerator chamber: top crown of regenerator usually adopts fused cast AZS block, 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.

Refractoriness Of Lining Refractory Of Glass Furnace

Le 16 février 2016, 04:22 dans Humeurs 0

Refractory material is an essential lining material in industrial furnace. In the continuous progress of science and technology, furnace updates from generation to generation which leads to the production process of refractory materials greatly improved. And these improvements are mainly around in the refractoriness, fire resistance, slag resistance, anti stripping and other aspects. Meanwhile, the types and applications of refractory materials have a variety of changes.

 

Most of the refractory materials are composed of multi elements and materials which have different melting point, when the temperature reaches a certain degree, the liquid phase is appeared at first, with the temperature continuous rising, the materials are completely fused, so it is a gradual process. The so-called different material brick refers to the main content of the brick, for example, the raw materials of clay refractory materials are mainly clay, and high alumina brick defines the level according to the level of aluminum content. Below refractoriness are for some common refractory materials:

 

1. clay brick: 1610~1750℃

2. silica brick:690~1730℃

3. high alumina brick:>1770~2000℃

4. magnesia refractory:>2000℃

5. zircon brick: >1630~1680℃

 

Zhengzhou Sunrise Refractory Co., Ltd. is mainly engaged in the research and development of glass refractory products. Sunrise as a glass refractory manufacturer can provide professional before-after guidance and excellent products such as fused cast AZS block, fused cast alumina block, silica brick, magnesia brick, zircon brick, zircon mullite brick, mullite series brick, sillimanite brick, etc. contact us, we will do our best for you.

 

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