by As a refractory expert around you, rewell academy pays attention to castable preforms, also known as refractory preforms.
The production method is to select refractory castable or plastic according to the requirements of customers, pour it into various prefabricated molds after full mixing, and form it by vibration and tamping.
After molding, put it into a room with constant temperature and humidity for curing, and then dry it to discharge the water.
In industrial kilns and thermal equipment, the use of precast blocks to build furnaces has many advantages that ordinary refractory brick masonry can not achieve.
The precast blocks of castable have better application performance and construction advantages than the usual corresponding castables.
Its main features are: 1 High compressive strength compared with ordinary products, the precast block of castable has higher compressive strength, which is increased by about 2 times.
2.
Good thermal shock resistance.
The thermal shock resistance of castable precast block is improved by 8 ~ 10 times.
3.
Excellent wear resistance.
The wear resistance of castable precast block is better than that of ultra-low cement castable of the same material.
4.
Save masonry time, no need for on-site pouring, no need to support and disassemble molds, and no need for construction machines and tools.
The formed parts are sent to the site and only need to be installed and assembled on site, which is convenient and fast.
The time of on-site construction process is greatly reduced, and the quality is stable.
It is not limited by on-site construction conditions and human factors.
The supplier provides effective guarantee for production.
5.
Save curing and baking time.
At the time of delivery, the supplier has completed all links of pouring, curing, drying and baking in advance, saved a lot of curing and baking process time, and effectively solved the problem of cracking of castable caused by the rush to ignite and heat up quickly on site, which is convenient for users.
6.
It is not limited by the ambient temperature.
For example, the temperature difference range of cement kiln is large in different countries and seasons all over the world.
During on-site construction, the high temperature in some countries can reach 43 ℃ ~ 48 ℃, while the low temperature in some countries can reach below minus 30 ℃.
There is also a large temperature difference from the south to the north in China, and the construction of castable is limited by the ambient temperature.
In case of excessive temperature fluctuation, appropriate manual control measures need to be taken to ensure the normal construction and construction quality.
Castable precast blocks can be installed in any environment.
7.
Easy replacement and disassembly.
It is very convenient to replace in actual production.
Which precast block is damaged can be directly replaced.
Just like replacing equipment parts, the replacement can be completed in a very short time to realize the desire of immediate replacement and immediate ignition.
8.
Longer storage period amorphous refractories usually have a shorter storage period, which is only a few months under dry conditions, while precast blocks greatly extend the storage period, which is expected to reach several years.
9.
The service performance of amorphous refractories with longer service life is greatly affected by site construction conditions and human factors.
For example, if the amount of water is too large, the actual performance on site is that the porosity increases, the strength decreases, or the strength decreases due to inadequate vibration, which affects the service life.
The prefabricated block overcomes the above shortcomings, improves the expected service life by 2 ~ 3 times, saves investment, saves energy and environmental protection.
Castables are widely used in refining ladle due to rapid construction and labor saving.
However, the performance of cast-in-situ body is greatly affected by temperature, pouring time, vibration intensity, curing time and drying time.
In order to solve this problem, revol refractory has developed corundum carbon free precast block, which has the following advantages: short installation time, no need for large mixer and forming equipment, no need for skilled installation procedures, short drying time compared with castable, suitable for rapid rotation of ladle, no explosive peeling, no thermal peeling, and better slag resistance.
Ladle corundum carbon free preform can effectively reduce the carbon content in molten steel.
It is suitable for low carbon steel or ultra-low carbon steel and meets the needs of current high process standard steelmaking.
Project rwtb-90 chemical composition Al2O3 + mgo90al2o3 380 volume density 110 ℃ x24h2 95 compressive strength 110 ℃ x24h301600 ℃ x3h50 flexural strength 110 ℃ x24h5 01600 ℃ x3h10 linear change rate after burning 1600 ℃ x3h ± 1.0..
