Amorphous Refractory Have Higher Strength
Silicate binder as an unshaped refractory binder is the main varieties of alkali-containing silicate, Amorphous Refractory commonly known as water glass.
In the refractory material used in the modulus of 2 to 3 of the amorphous. Amorphous Refractory Its density and melting point is not fixed, depending on the modulus of the corresponding changes in the modulus of 4 within the range, the density increases with the SiO2 content increased. Amorphous Refractory In the unshaped refractory material in the use of viscous water glass, the density of 1.30 ~ 1.40g / cm3.
Water glass heat-resistant concrete is water glass as binder, and adding appropriate sodium fluorosilicate as a coagulant. Rely on water glass hydrolysis of silica gel, the aggregate, Amorphous Refractory admixture particles together. In a variety of heat-resistant concrete, water glass heat-resistant concrete strength is higher, but its refractoriness and load softening temperature is low. This heat-resistant concrete for 1000 ℃ below the requirements of a higher strength, good wear resistance, acid corrosion can be used, Amorphous Refractory but can not be used for water and water vapor often the site.
The modulus, density and amount of water glass binder are important factors influencing the water glass refractory castable. From the hardening mechanism, Amorphous Refractory it can be seen that the strength of the refractory aggregate and the powder is cemented by the adhesion, condensation and agglomeration of the silicic acid gel. Therefore, when there is sufficient sodium fluorosilicate, the modulus of the water glass solution increases or the density increases, and a large amount of silicic acid gel can be precipitated, Amorphous Refractory thereby improving the strength. The amount of water glass increases, the stomatal pores increase, performance is reduced.
Ladle (Sheng Gang bucket) is responsible for carrying the molten steel and the furnace outside the refining of the dual task, with the development of steelmaking technology, China's ladle refractory has also been a very good development. Especially since the 20th century, 80 years, China's refractory research institutions, Amorphous Refractory production enterprises and the use of manufacturers, in close cooperation with China's national conditions, and constantly develop a new type of ladle refractory materials, Amorphous Refractory so that China's ladle refractory with a faster The pace of development, to meet the rapid development of China's steel industry needs.
With the continuous development of steelmaking technology and the continuous improvement of steel production and quality, clay ladle lined with short service life, since the 20th century, Amorphous Refractory the late 60s, some steel mills in our country began to use a variety of high-aluminum lining brick, So that a substantial increase in ladle life.
Wax stone brick is based on pyrophyllite as the main raw material production of a firing products. The early 20th century, the early 70s, a refractory plant in Fujian production of wax stone ladle brick in Maanshan Iron and Steel, Anshan Iron and Steel, on the steel plant, Amorphous Refractory Sanming Steel and other iron and steel enterprises on different types of ladle on the trial. The results show that the use of wax stone brick performance is better than the use of clay bricks and third-class high alumina brick. In the Magang 15t ladle on the use of life expectancy of 66 times. WISCO two steel mills 70t ladle also tried the plant production of SiO2 content of 72% wax stone brick, but the effect is not ideal, the service life of only 14 times. Amorphous Refractory Baosteel 300t ladle in September 1985 to 1988 has been used in Japan imported wax stone brick, the average life of 38 . The physical and chemical indexes of wax brick brick produced by a factory are: SiO2 78.95%, Al2O3 18.85% ~ 19.51%, Fe2O3 0.44% ~ 0.52%, apparent porosity 14% ~ 18%, room temperature compressive strength 32.9 ~ 62.9MPa. Due to various reasons, wax stone brick in China's ladle has not been widely used.