对狭缝式透气砖在大型精炼钢包中的损毁原因进行了分析，热应力和强大的冲刷磨损作用是两个主要因素。
The wear reason of slit purging plug used in the large refining ladle has been analyzed in detail in the paper, that is the thermal stress and strong erosion and abrasion.
针对传统钢包喷粉工艺的不足，开发了从钢包底部喷吹的喷粉型狭缝式透气砖。
Considering deficiencies of traditional powder injection in ladle, slot plug with conical fluidized bed used for bottom powder injection in ladles was developed.
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