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Development History of Middle Grade Magnesia as Refractories

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Development History of Middle Grade Magnesia as Refractories

Date:2017-05-05 author: click:

Development History of Middle Grade Magnesia as Refractories




Refractories in the ancient, medieval and Renaissance times, refractories for blast furnaces, coke ovens and hot stoves before and after the industrial revolution, new refractories and their manufacturing processes in the late modern times, modern refractory manufacturing technologies and major technological advances, as well as prospects for future development of refractories, refractories and high temperature technologies The concomitant appearance originated roughly in the middle of the Bronze Age. In the Eastern Han Dynasty, clay refractories were used as kiln materials and boxes for porcelain firing. At the beginning of the 20th century, refractories developed towards high-purity, high-density and ultra-high temperature products. At the same time, amorphous refractories and refractory fibers with low energy consumption and no need to be burned at all appeared. Modern, with the development of atomic energy technology, space technology and new energy technology, it has high temperature resistance, corrosion resistance and thermal vibration resistance.




Refractories with comprehensive excellent properties such as scouring have been applied. There are many factories in China that produce refractory products. China has abundant resources, and for this reason, major foreign investors have also come to China to show their skills and make an appearance. In the northeastern part of China, there are abundant refractory suppliers, which has led other foreign investors to question the low export prices. In 2003, the EU proposed anti-dumping of new refractory products in China, which limited the export of products to the EU. In 2006, in order to protect the massive loss of raw material resources, China reduced and exempted some industries from export tax rebates, which greatly restricted the export of products. But this does not restrict the sales of some foreign brands to a large extent, because they have decades or even hundreds of years of sales and production experience, and have greatly occupied the market, but also created their brand effect in various continents.




China used clay with less impurities more than 4000 years ago to make pottery, and has been able to cast bronze. During the Eastern Han Dynasty (25-220 A.D.), clay refractories were used as kiln materials and boxes for porcelain firing. At the beginning of the 20th century, refractories developed towards high purity, high density and ultra-high temperature products. At the same time, amorphous refractories and high refractory fibers (used in industrial kilns above 1600 C) were developed, which did not need firing at all and consumed little energy. The former, such as alumina refractory concrete, is often used in the inner wall of the second stage converter of ammonia plant in large chemical plants, and the effect is good. Since the 1950s, the rapid development of atomic energy technology, space technology and new energy development technology requires the use of special refractories with comprehensive excellent properties such as high temperature resistance, corrosion resistance, thermal shock resistance, erosion resistance, such as oxides with melting point higher than 2000 C, refractory compounds and high temperature composite refractories.

Medium grade magnesia

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