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通过对某厂不同镇静时间下的钢液和渣取样,采用非水溶液电解法和Factsage软件分别对钢包镇静过程中夹杂物的变化规律和渣高效吸收夹杂物的条件进行了分析。结果表明:镇静开始后的前17 min小夹杂碰撞为大夹杂,钢液T.O含量降低;24 min后,夹杂物聚合成簇状,数量减少,建议钢包镇静时间控制在28~33 min;渣碱度为6.5~7.5,钙铝比在1.5~1.7,w(SiO2)=6%~8%,w(Mg)≤5%时,渣中氧化铝达到饱和时的溶解量是原渣系的1.85倍,有利于夹杂物的高效吸收,为实际生产降低铸坯大型夹杂物含量提供了有力的理论依据。
Through the sampling of molten steel and slag under different calm time in a factory, the changing regularity of inclusions and the conditions of efficient slag absorption were analyzed by non-aqueous electrolytic method and Factsage software respectively. The results showed that the small inclusions in the first 17 min after the beginning of sedation were large inclusions and the content of TO in the molten steel was decreased. After 24 min, the inclusions aggregated into tufts and decreased in number. The ladle sedation time was controlled at 28-33 min. Degree of 6.5 ~ 7.5, Ca ~ Al ratio of 1.5 ~ 1.7, w (SiO2) = 6% ~ 8%, w (Mg) ≤ 5% Times, is conducive to the efficient absorption of inclusions, for the actual production of slab to reduce the large inclusions provide a strong theoretical basis.