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Selection of refractory castables for cupola lining
  • Time:Jul 12, 2022
  • Views: 3

The cupola is pure and low-oxidation smelting at high temperature, and can withstand high temperature and chemical erosion during the smelting process. The smelting time of cupola furnace is 6-10 hours, the furnace lining is eroded greatly, and the furnace condition is unstable. The erosive atmosphere of the furnace lining has high requirements on the selected refractory castables. It is better to use refractory castables with an aluminum content of about 70% to 80% in the feeding area and the launder. Good thermal shock, strong resistance to alternating hot and cold shocks.

冲天炉的主要部件是炉膛、桥和渣分离器。该部分具有与炉渣接触,严重的化学侵蚀以及铝含量高的耐火浇注料。由于基体本身的纯度,杂质小,抵抗铁水侵蚀的能力强。抗氧化能力也相当不错。

                                                    1

在选择冲天炉衬里的浇注料时,应考虑炉渣的成分,因为燃烧材料中仍有一定比例的石灰石,而石灰石具有碱性成分,因此使用的耐火浇注料必须具有抵抗碱侵蚀的能力。然后是浇注料中碳化硅的成分,耐磨,耐渣侵蚀。

如果受到碱性成分的侵蚀,镁质或尖晶石是不错的选择。如果将尖晶石和碳化硅添加到浇注料中,这种复合材料是理想的选择。但是,碳化硅和尖晶石应根据炉渣成分以不同的比例添加。

如果炉衬顶部也可以用塑料制成,便于施工。塑料还应考虑陶瓷粘接的成分。最好使用磷酸键合塑料代替水玻璃,因为磷酸键合塑料具有良好的强度和耐高温性。如果使用浇注料,日常保养还是要用塑料进行维修,可以缩短维修时间。

还应该注意的是,如果在炉膛生产过程中将焦炭作为熔炼冲天炉的热源,则应控制焦炭的质量,以稳定炉衬的使用。

归根结底,用于炉衬的耐火浇注料仍应是铝含量高的耐火浇注料,因为纯浇注料具有良好的耐磨性,而带有碳化硅或尖晶石成分的浇注料具有更好的耐腐蚀性。

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