How to choose refractory bricks for glass kiln
[Summary description] The refractory degree of general refractory bricks indicates its high temperature resistance. However, high refractory is not necessarily a high-grade refractory brick, and other properties should be comprehensively considered. This situation will be encountered when refractory bricks are used in glass pool furnaces. Even refractory bricks with low refractory degrees are used for better results.
The refractory degree of general refractory bricks indicates its high temperature resistance. However, high refractory is not necessarily a high-grade refractory brick, and other properties should be comprehensively considered. This situation will be encountered when refractory bricks are used in glass pool furnaces. Even refractory bricks with low refractory degrees are used for better results. Such as large bricks on the wall of the pool furnace, the use of high-alumina refractory bricks and electrically fused zirconium corundum bricks is the case. The refractory degree of the former is 1875 ° C, and the latter is only 1805 ° C. However, as a result of the use of soda-calcium glass pool furnaces, the life of the former is only two years, while the life of the latter can reach more than three years.
High-alumina refractory bricks have high refractory properties but low service life. Although zirconia corundum refractory bricks have low refractory properties, they have a long service life. Another electronically cast corundum refractory brick has a refractory performance of 1875-1900 ° C. This refractory brick can only be barely used for three years under the same circumstances. It can be seen that judging the quality of refractory bricks by refractory strength is not comprehensive. It is refractory bricks with the same refractory degree and the same chemical composition. Due to different manufacturing methods, the use effect is also very different. If the chemical composition is the same, the refractory is clay bricks with a refractory degree of 1730 ° C. Hand-formed and high-pressure-formed products are also used as regenerator lattice bricks. During cold repair, it will be found that the former is damaged very seriously, and the latter is damaged much less. Not only does this problem occur when judging refractory bricks based on fire resistance, but also when refractory bricks are selected only according to properties such as strength and thermal impact resistance. Similar problems will occur.
Therefore, it is impossible to imagine all the characteristics of refractory bricks based on only one characteristic. It is like a blind man touching an elephant. If he touches an elephant's leg, he thinks that the elephant is a big thick pillar, which is undoubtedly very wrong. If a refractory brick with known refractoriness is crushed into extremely small particles and then reshaped by an appropriate method, its refractoriness changes again. It can be seen that the structure of refractory bricks has a great influence on the refractoriness. Therefore, it is concluded that its refractoriness is also one-sided by using the average chemical composition.
From the above analysis, it can be seen that to choose a good refractory brick must not rely on only one or two performance measurements, but must conduct a comprehensive analysis of the entire performance of the refractory brick, and even through small tests, in order to evaluate its applicability.