The action and effect of calcium treatment in ladle are introduced. Present status of foreign and domestic techniques on Ca-cored wire feeding in ladle was analyzed. The results show that there are surface feeding stage and inner feeding stage abroad, and the first and second generation apparatus were explored in the latter stage. The calcium recovery of the second-generation wire feeding is significantly higher than the surface of the wire feeding. China is still in the surface feeding stage. It is suggested that China should focus on the new wire-feeding lance, in which the inert gas orifice...
