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Comparison between Unfired Pyrophyllite Bricks and Fired Pyrophyllite Bricks
Japan was the first country to use natural pyrophyllite raw materials to prepare pyrophyllite refractory materials. The production of pyrophyllite bricks has a history of more than 100 years. Pyrophyllite bricks are known as “Japanese Ace” in Japan. China has abundant pyrophyllite reserves, about 300 million tons of pyrophyllite reserves, and began to develop pyrophyllite refractory materials in the early 1970s. With the various advantages of pyrophyllite bricks in actual use, such as no slag, micro-expansion at medium and high temperatures, and reduced brick seams, the preparation of pyrophyllite bricks has also developed rapidly. With the promotion and development of pyrophyllite bricks, many refractory manufacturers and scientific research institutions in China began to develop and prepare pyrophyllite bricks. Among them, the pyrophyllite bricks produced by Rongsheng Refractory Factory have good results in use.
Before the 1980s, the bricks used for lining the molten iron tanks in China were generally fired bricks such as clay bricks, high-alumina bricks, and semi-silica bricks. It was not until the end of the 1980s that unburned pyrophyllite bricks with siliceous pyrophyllite (low alkaline oxide content) as the main raw material were successfully developed and promoted in Chinese refractory factories.
Comparison between Unfired Pyrophyllite Bricks and Fired Pyrophyllite Bricks
Compared with fired phyllite bricks, unfired phyllite bricks have several advantages:
(1) Compared with fired phyllite bricks, the production process of unfired phyllite bricks is simpler and more novel. Since high-temperature firing is not required, fuel consumption is reduced, energy is saved, and it is also of great significance to environmental protection.
(2) The reduction in fuel consumption has greatly reduced production costs. Moreover, since the firing process is reduced, the production cycle is greatly reduced.
(3) Compared with fired phyllite bricks, the size of unfired phyllite bricks is regular and precise, and there will be no shrinkage, deformation, and other problems, and the yield rate is high. At the same time, since firing is not required, the production process of unfired phyllite bricks is shortened, and the damage caused by the transportation process is reduced, thereby improving the yield rate of phyllite bricks.
(4) Compared with fired phyllite bricks, unfired phyllite bricks will produce micro-expansion during firing, reducing the gap between bricks and better preventing slag or molten iron from penetrating through the gaps between bricks to the back of the working layer and corroding the permanent layer.
With the improvement of the steelmaking process and the introduction of new technology, the use requirements of refractory materials for lining molten iron tanks are becoming more and more demanding. Some Al2O3-SiC-C refractory materials can better resist the erosion of high-temperature slag than phyllite bricks and are gradually used in molten iron tanks, and phyllite bricks have a trend of gradually decreasing. However, phyllite bricks have the characteristics of low price and simple process, especially no slag during use, no impact on molten iron capacity, thermal expansion, and close bonding between bricks, etc., and still occupy a large share of refractory materials for lining of molten iron tanks.
Rongsheng refractory material manufacturer can provide high-quality refractory lining materials for high-temperature industrial furnaces, effectively extending the service life of high-temperature industrial furnace linings. Rongsheng manufacturer’s refractory lining materials include various high-alumina refractory bricks, pyrophyllite bricks, corundum brick insulation bricks, refractory castables, refractory ramming materials, refractory plastics, etc. Contact Rongsheng for a free quote.
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