LATS refining ladle slag modifying with CaO-CaF₂

Hongming Wang1,2), Guirong Li1), Zhongming Ren3), Bo Li3), Xuejun Zhang3), and Guomin Shi3) 1) School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China 2) Shanghai Enhanced Laboratory of Ferro-Metallurgy, Shanghai University, Shanghai 200072, China 3) Stainless Steel Branch, Baosteel Group, Shanghai 200431, China

摘 要：To reduce the slag sticking onto the snorkel of the ladle during the ladle alloying treatment station （LATS） process, CaO-CaF₂ （the mass ratio of CaO/CaF₂ is 1:1） was employed as the modifier of the LATS refining ladle slag. The effect of CaO-CaF₂ on the melting point, viscosity, and desulfurizing capability of the ladle slag was investigated. The melting point of the unmodified ladle slag is 1439°C. When adding 20wt% CaO-CaF₂, the melting point is decreased to 1327°C. At 1500°C, the viscosity of the unmodified ladle slag is 6.5 Pa·s, which can be decreased lower than 2 Pa·s by adding more than 10wt% CaO-CaF₂. The experimental results of desulfurization of the melts show that the desulfurizing power of the ladle slag can be enhanced by adding CaO-CaF₂.

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