What are the advantages of corundum bricks?
Release time: 2025-04-30
High: Anti-scouring, anti-corrosion, no brick falling; reduce the number of repairs and extend the service life.
What are the advantages of corundum bricks? Friends in the refractory materials industry should have found that corundum bricks have been accepted and applied by more and more industries. Today, let's talk about the advantages of corundum bricks from three aspects.
What are the advantages of corundum bricks?
I. Raw Materials
Natural hydrated aluminum oxides include gibbsite and boehmite. These hydrates can obtain alumina (γ-Al2O3) after heating and dehydration. After heating to 1450℃, it is converted into corundum (α-Al2O3). Due to the small reserves of natural corundum and natural pure gibbsite in nature. Therefore, industrial alumina is used as the raw material for manufacturing corundum. The industrial alumina obtained is mainly α-Al2O3. The volume shrinkage rate when γ-Al2O3 is converted to α-Al2O3 is 13%, and in order to make the α-Al2O3 grains develop well, the raw materials need to be treated at a higher temperature. After high-temperature firing, the α-Al2O3 grains can grow 25～40 times.
II. Manufacturing Process
Corundum bricks are divided into three types: cast corundum bricks, electrofused corundum re-sintered bricks, and sintered corundum bricks. Cast corundum bricks are made by melting industrial alumina and a small amount of pure soda and quartz powder in an arc furnace, then casting, annealing, and other processes, and then mechanically processed into the required shape and size. Electrofused corundum re-sintered bricks are made by crushing electrofused corundum particles and fine powder, adding a small amount of clay and binder, and forming them with a brick press after thorough mixing. The brick density is 2.75～2.85g/cm3. After the bricks are dried, they are fired at 1700～1800℃.
III. Advantages
1. Energy saving: Taking a 5000t/d production line as an example: 20 tons of standard coal can be saved every day; 5 million yuan can be saved for the enterprise every year.
2. High: Anti-scouring, anti-corrosion, no brick falling; reduce the number of repairs and extend the service life.
3. Environmental protection: Reduce waste heat emission and meet environmental protection standards.
4. Personal: Reduce the cylinder temperature by more than 50℃; protect the operation of thermal equipment.
5. Stable: No cracking, no peeling, thermal shock up to more than 20 times (1100℃-water cooling).
The above is a summary of the advantages of corundum bricks from three aspects. We can see that this material plays a significant role in energy saving and environmental protection. Our country has been advocating environmental protection, so the popularity of corundum bricks is also very normal.
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