The Study On The Wear Mechanism Of Silica Brick Used In The Arch Of Glass Melting Furnace And The Development Of A High Quality Silica Brick

In this paper, different parts of the residual cut from the silica brick used in the arch of glass melting furnace were examined by means of chemical analysis, X-ray and SEM. The data about the change of chemical and mineral phase composition were obtained, and a discussion was made on the wear mechanism of the silica brick used in the arch of glass melting furnace. A new generation production of silica bricks with good-quality was developed on this basis. The study shows that: there are several parts with different chemical composition in the silica brick after used in the arch of glass melting furnace from the cold face to the hot face, and there is a redistribution of chemical composition among the used brick. The temperature gradient is analysed to be the main factor of this phenomenon, which resulted in a difference in the vapor pressure of sodium vapor and in the diffusion velocity of them from part to part. The silica brick used in arch of glass melting furnace is worn mainly in the way of erosion and the form of melten drop on hot face, while the redistribution of chemical composition and the transformation of tridymite christophile enhanced this process.The high quality silica brick can completely afford using in the arch of glass melting furnace. In the developed bricks, the content of SiO₂ is greater than 96%, both the melting indexes and the content of Fe₂O₃ are less than 0.5%, meanwhile, its refractoriness under load is higher than 1690℃. In addition, the apparent porosity, cold compress strength, and true density of the bricks are 19%, 65MPa, 2.33g/cm³ respectively.