大罐顶渣向钢液增氧因素分析

Analysis on Oxygen Pick-Up in Molten Steel From Ladle Slag

依据实验数据计算结果,对钢液增氧的因素及其采取的相应措施进行了分析与探讨。研究结果表明:在氧化性顶渣条件下,钢液中w([Als])的变化率≥20%,而在还原性顶渣条件下,钢液中w([Als])的变化率≤10%;氧化性顶渣对钢液供氧的贡献率大于钢包与中间包衔接的水口处吸气对钢液供氧的贡献率;减少转炉下渣量及对顶渣进行改质可减轻炉渣向钢液供氧程度;大罐下渣量不会使中间包成为新的增氧源。

Analysis of factors of oxygen pick-up in molten steel and corresponding measures based on experimental data are presented. For oxidizing top slag, the change rate of w（[Als]） in the molten steel was ≥20% ; but for reducing top slag, the change rate of w（[Als]） in the molten steel was ≤10%. The contribution of oxidizing top slag to oxygen pick-up is more than that of air suction at the joint point of ladle and tundish. Reduction of slag take-over and modifying top slag can decrease the degree of oxygen pick-up in molten steel; the tundish will not become a new source of increasing oxygen by ladle slag.