Compared with pour-over treatment process in an open ladle, nodularizing in the Tundish coveredladle has following advantages:(a) reaction fumes and glare could be reduced obviously;
与用敞口包冲入法比较，用带盖包进行球化处理的好处是：①反应镁光和烟尘大幅度减少；
2
He put a gourd bottle on the ground and covered its mouth with a copper coin. He then scooped out a ladle of oil from his big jar, held it high in the air and began to pour it into the gourd.