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Thermal shock resistant mullite brick for glass furnace
Brief introduction of Mullite brick
Mullite bricks are a kind of advanced refractory material, mainly composed of mullite (3Al2O3·2SiO2). This brick has good high-temperature properties, including high refractoriness, good thermal shock stability, excellent erosion resistance and low thermal expansion. Therefore, they are widely used in various high-temperature industrial applications, such as furnace linings and kiln linings in steel, cement, glass and ceramic production.
Advantages and characteristics of Mullite brick
(1) High temperature resistance, high refractory temperature and high load softening temperature.
(2) Chemical resistance, strong resistance to acidic solutions or molten slag.
(3) Antioxidant. It is not easy to react with O2, H2, CO and other gases.
(4) Good thermal stability, stable volume at high temperature, not easy to expand or shrink.
(5) Good thermal shock resistance, resistance to rapid cold and heat and not easy to peel off.
(6) High compressive strength at room temperature, and it is not easy to wear when handling or unloading.
Application of Mullite Bricks
The characteristics of mullite bricks make them ideal for many high-temperature applications. For example, in the steel industry, they can be used for the lining of steelmaking furnaces, continuous casting machines and heating furnaces; in the cement industry, they can be used for the lining of rotary kilns and preheaters; in the glass industry, they can be used for the lining of melting furnaces and annealing kilns; in the ceramic industry, they can be used for the lining of tunnel kilns and shuttle kilns. In addition, mullite bricks also have good chemical stability and can resist acidic and alkaline corrosion, which makes them also perform well when handling corrosive media.
Specification of Mullite brick
| Item | 75 Mullite Brick | 70 Mullite Brick |
| Al2O3 (%) | ≥75 | ≥70 |
| SiO2(%) | ≤23 | ≤28 |
| Fe2O3 (%) | ≤0.3 | ≤0.3 |
| (g/cm3)Bulk Density | ≥2.7 | ≥2.65 |
| (%) Apparent Porosity | ≤17 | ≤17 |
| (Mpa) Cold Crushing Strength | ≥140 | ≥120 |
| (0.2Mpa,0.6%) Refractoriness under Load | ≥1700 | ≥1680 |
| (%) Reheating Linear Change Rate | 0.2 | 0.2 |
Thermal shock resistant mullite brick for glass furnace
As a common brick for glass melting furnace, mullite brick can be used in many parts of glass furnace. The following is the application of mullite brick in various parts of glass melting furnace.
1. Mullite brick for glass furnace Front wall
The front wall of the glass melting furnace is close to the batch material area. Due to the large temperature fluctuations in this area and the large amount of dust in the raw materials, the conditions are relatively harsh. Material dust erosion ability. Therefore, the hanging wall and the wing wall of the feeding port can be designed to use re-sintered fused mullite bricks.
2. Mullite brick for glass furnace Neck
The neck is generally designed with a water bag and agitator. During equipment maintenance, there will be a large temperature difference in the space of the neck. It is a better design choice to use sintered mullite bricks in this place.
3. Mullite brick for glass furnace Port and upper wall of regenerator
Because mullite bricks, especially mullite bricks made of fused zollite, also have good resistance to the erosion of batch materials and alkali vapor, re-sintered fused mullite bricks can be used in port. At least it can be used in the last few pairs of port to improve the operating environment of the small furnace and reduce the cost of this part. Similarly, re-sintered fused mullite bricks can also be used in the upper wall of the regenerator. Compared with alkaline bricks, mullite bricks have lower thermal conductivity and expansion coefficient, which can reduce the expansion and deformation tendency of the kiln body and reduce the The cost of heat dissipation and heat preservation of the kiln body.
4. Mullite brick for glass furnace used for Coal-fired glass melting furnace port ascending channel and tongue
As we all know, the service life bottleneck of the gas kiln lies in the small furnace. In the traditional design, silica bricks are used to equip the fused zirconia corundum brick tongue. Since the temperature here is lower than 1450℃, the use of silica bricks in this part is not the best choice. , this part is severely eroded, and the good anti-corrosion performance of mullite bricks can prolong the service life of this part. In addition, fused zirconia corundum bricks are used for the tongue wall. Due to their poor thermal shock stability, re-sintered fused mullite bricks may be a better choice.
5. Mullite brick for glass furnace for Checker bricks for gas regenerator
The grid body of the gas regenerator currently designed is made of clay bricks, and the general service life is 3 years, which cannot meet the needs of the increasingly long kiln age. Replacing the grid bricks is not only labor-intensive, but also causes damage to other parts of the furnace. Using a certain amount of sintered mullite bricks on the top of the gas grid can increase the service life of the kiln.
6. Mullite brick for glass furnace for Operating hole
Mullite bricks have good thermal stability and high temperature strength, and can be used in various operating holes of the furnace, such as observation holes, spray gun holes, air supply holes and other parts.
Packing of Mullite brick
1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000mm,
2.Load weight of each pallet: 1.5-2.0 tons,
3.230*114*65mm:512PCS/Pallet, 230*114*75mm:448PCS/Pallet.
Shipping of Mullite brick
1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quanlity and quantity guaranteed, and also in accordance with the contract and customer's requirment completely.
Contact us:
Josie Xiao
Mobile Phone:+8618037198058
WeChat / Whatsapp / Skype: +8618037198058
E-mail: sales03(at)firebricks-supplies.com