[China Glass Net] Silica brick is an acidic refractory material mainly composed of tridymite, cristobalite and a small amount of residual quartz and glass phase. It has strong resistance to acid slag, but it is eroded by alkaline slag and is not resistant to Al2O3, K2O and Na2O. Oxide corrosion, its load softening temperature is high, between 1640 ° C ~ 1680 ° C, and the quartz quartz, cristobalite melting point (1670 ° C and 1713 ° C, respectively), the larger disadvantage is the low thermal shock stability However, the degree of refractoriness is similar to the softening temperature of the load, and it is not deformed for a long time at high temperature, which is beneficial to ensure the structural strength of the masonry when it is used.
Silica brick is mainly used in the carbonization chamber of the coke oven and the partition wall of the combustion chamber, the top of the soaking furnace, the hot air furnace, the acid flat furnace and the glass furnace, or the vault. Nowadays, in the field of ironmaking technology, the new technologies of direct reduction and melting reduction ironmaking are gradually being transformed into productivity. In the coking industry, a kind of “formed coke [1]†without coke oven production has been developed, which can replace some of the traditions. Coke. With the promotion of these new technologies, the demand for silica bricks will gradually decrease. However, in the glass kiln at home and abroad, in addition to the replacement of other bricks in the lattice of the regenerator and part of the chest wall, the silica brick still maintains its dominant position in the dome of the furnace. From the perspective of domestic and foreign markets, the sales of silica bricks in China will not decline significantly for a long time in the future. Therefore, enterprises that produce silica bricks should not give up their efforts in technological progress while paying close attention to market changes.
Like most sintered refractory bricks, silica bricks are produced by semi-dry method and tunnel kiln firing. Cracks in the production process are one of the main reasons for the increase in scrap rate. This paper analyzes the crack types and causes of silicon brick products, which shows that by strictly controlling the main mechanical forming and firing process of silicon brick production, it can reduce the formation of cracks in silicon bricks and significantly improve product quality. This experience can also be used as a reference for the production of other sintered refractories.
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