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Lightweight thermal insulation bricks, also known as thermal insulation bricks, are commonly used refractory bricks in refractory materials. Lightweight thermal insulation bricks have the characteristics of good thermal insulation performance. Lightweight insulation bricks are generally divided into the following types:
1. Lightweight silica brick
Lightweight silica brick is a new type of refractory material, which is often used in the steel industry. It is generally used in the wall of the hot blast stove, the high hot blast channel, and is similar to the exhaust fan of the blast furnace. Due to the difference in the shape and location of the hot blast stove, the temperature range is Usually between 1000°C and 1300°C, while the load softening temperature is around 1640°C. In reality, many cases can prove that lightweight silica bricks can be used in kilns below 1500 ℃ ~ 1600 ℃ and can be used for a long time. span the stove top.
2. Diatomite insulation brick
Diatomite thermal insulation brick is a light thermal insulation material made of diatomite as raw material. It has good thermal insulation performance and can be built on the back of clay bricks as a thermal insulation layer. Diatomite insulation brick has stable performance and energy-saving effects. It’s thermal conductivity and expansion coefficient are small, which can ensure the stability of high-temperature equipment. At the same time, the thermal effect of diatomite insulation bricks has strong anti-permeability performance, is not easy to be bonded by the melt, and can even resist local mechanical vibration of the kiln without cracking.
3. Polyhydrogen insulation brick
This product has good thermal insulation performance. Since the raw materials are added with materials that can expand during production, there are many holes, low thermal conductivity, and good thermal insulation performance.
Because of the irregularity of the brick body due to its expansion, and further work and construction to achieve the size people want, the cost is high. Although the performance of the hydrogen-polymerized brick is superior, it also has its own obvious disadvantages, that is, the environmental protection performance is relatively low. Poor, usually used in large glass furnaces, etc.
4. Lightweight clay insulation brick
The aluminum content of lightweight clay insulation bricks is generally between 30% and 46%. The contact surface can be coated with a layer of refractory coating, and the refractory temperature is usually 800-900°C, and the maximum does not exceed 1200°C. It has the characteristics of high strength, good rigidity, and good thermal insulation performance.
5. Lightweight high alumina insulation brick
The aluminum content of lightweight high-alumina insulation bricks is not less than 48%. It is a good thermal insulation material and can be used to build high-alumina refractory bricks or the back of lightweight silica bricks. When directly in contact with flames, the temperature can reach 1350°C, with light bulk density, small shrinkage value, impermeability, good thermal shock resistance, refractoriness up to 700°C, etc.
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