Silicon brick is the most commonly used refractory for glass furnace in the structure of glass tank furnace. The industrial application of silicon brick was more than two thousand years later. In 1822, the first industrial silicon brick, and used in the iron and steel industry coking furnace. After the First World War, the iron and steel industry developed greatly, because of the need of large coking furnace, the production of silicon brick developed rapidly. The invention of high density silicon bricks in 1944 greatly improved the quality of silicon bricks. At present, silicon brick is developing towards high purity, low porosity and no untransformed quartz crystal. Since the highest melting point of Si02 crystal is 1725℃, the refractory of silicon brick cannot exceed this temperature. With the increase of melting temperature, the silicon brick is likely to be replaced by electrofused cast refractory material with higher refractoryand better corrosion resistance. However, silicon brick is still a very good refractory material when used in pool furnaces with melting temperature of no more than 1630~G.
The main advantages of silicon brick are
1. High softening temperature under load. The softening temperature of high quality silicon brick under load can reach 1705℃, and that of general silicon brick can reach 1630℃.
2. Good shock resistance in high temperature. The volume of the silicon brick will hardly change above 700℃, so the temperature fluctuation above 700℃ will not cause damage to the silicon brick.
3. The components are easy to melt and diffuse in the glass, and have little pollution to the glass liquid. The main component of silicon brick is SiO2, which is the main component in general glass. Therefore, the eroded material of silicon brick is easy to melt and diffuse in the liquid glass, thus the formation of stones and stripes is less than that of other bricks.
4. Low price and easy to manufacture.
The glass kiln brick should be stored in a waterproof warehouse. It can still be used after being wet by water and slowly dried at a temperature below 100℃. The strength of water-bearing silicon brick is affected after freezing, and it needs to be checked again after drying. Expansion joints shall be set aside according to the expansion rate provided by the manufacturer. Oven or periodic use of temperature for a time curve should be reasonable, to be specific before 600℃ expansion intense to be strictly controlled. The quality of the mud used in bricklaying should be appropriate to the bricks. Sometimes brick damage is due to the most erosion of the brick joints leading to alkali vapor injection.
In order to improve the melting temperature and extend the whole life of the furnace, some glass factories have changed the furnace mouth and parapet into fused cast brick, and some have changed the arch or part of it into other materials. The consumption ratio of silicon brick may be small, but the silicon bricks has the advantages of high softening temperature under load, light weight and low price. The glass kiln arch and part of the furnace superstructure will still use silicon bricks. Therefore, it is still important to improve the quality of silica bricks in glass kiln. We are the high quality silicon brick manufacturer, the quality is stable reliable, the price is reasonable, has reached the friendly cooperation relations with the domestic and foreign numerous customers, welcome everybody to come to consult to purchase, we will wholeheartedly serve for you.
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