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ABSTRACT Recently, the material of castables used for wall and bottom of steel ladle has been changed from alumina-spinel to alumina-magnesia because the corrosion and penetration resistance of the alumina-magnesia castables are mproved more than the alumina-spinel castables due to the in-situ spinel formation. Regarding the properties of spinel-containing castables, we have carried out laboratory experiments on three types of spinel-containing castables (alumina-spinel, aluminaspinel- magnesia and alumina-magnesia),and the results have been applied to steel ladle. According to the laboratory experiments the magnesia-containing castable showed dramatic linear expansion at the over 1200℃ due to the in-situ spinel formation, and the aluminamagnesia castables showed the highest corrosion resistance among three types of castables. However, the field test showed different result. The aluminaspinel castable could maintain stability without spalling. On the other hand, the alumina-spinel-magnesia could not satisfy the expected life time due to spalling. We can assume that it is due to the difference in spinel generation speed, which is caused by the reaction between alumina and magnesia on the movable and unmovable surface. One of effective methods to control the expansion is addition of microsilica. Nonetheless, it is important to control the optimal speed and microsilica content in castables according to the operational condition. |
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RXMCDM: 金币+1, 多谢应助！ 2014-09-16 08:15:08
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摘要 最近，用于钢包壁和底部的耐火浇注料的材料已经由氧化铝-尖晶石换为氧化铝-氧化镁尖晶石，因为氧化铝-氧化镁耐火浇注料的抗腐蚀和耐穿透性比氧化铝-尖晶石耐火浇注料得到更好的改进，因为这两种材料是在尖晶石形成过程中于原位产生的。关于含尖晶石耐火浇注料的性能，我们已经对三种类型的含尖晶石耐火浇注料（氧化铝-尖晶石，氧化铝尖晶石-氧化镁以及氧化铝-氧化镁）在实验室进行了实验，而且结果已经应用到钢包。根据在实验室中进行的实验，含氧化镁的浇注料在超过1200℃时发生剧烈的线性膨胀，因为在原位有尖晶石的形成，而且铝镁耐火浇注料在三种类型耐火浇注料中具有最高的耐腐蚀性。但是，现场测试显示的结果不同。氧化铝尖晶石浇注料能够保持稳定而不剥落。另一方面，氧化铝-尖晶石-氧化镁因其剥落而不能满足预期寿命。我们可以假设，这是由于在尖晶石生成速度方面的差异，而该差异是由于在可移动和不可移动表面上氧化铝和氧化镁间进行的反应引起。其中一个有效控制膨胀的方法是加添硅微粉。当然，重要的是要根据操作条件来控制最佳速度和耐火浇注料中硅微粉的含量。 |
2楼2014-09-16 03:13:43
