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以前研制的往转炉中喷粉状石灰的工艺不允许在进一步脱磷的第一阶段添加4～6t以上石灰,这样也就不能保证铁水充分喷出。最近研制出了一种可以在第一阶段,特别是最初时刻添加粉状石灰,以降低铁水烧损及加速脱磷的新工艺。因为在这个时间以前,块状石灰还没有开始熔解,并且上次冶炼的残渣还处于硬状态,也就是说,它们还不能加入脱磷反应中。该工艺包括以前的煤添加剂(2～5kg/t钢)冶炼“燃烧”。稳定“燃烧”后立即放入粉状石灰,这时其耗量最大。而当锰和硅的氧化对温度升高产生影响以及碳氧化反应占优势,达到稳定的最高氧化速度(根据煤气分析器指示)时,石灰减少。从这时开始,要根据废气中碳的氧化物的含量改变添加粉状石灰量。对所获得数据的分析表明,新工艺能达到较高的工艺指标。试验(A)和比拟(B)冶炼指标如表1所示。
Previously developed to spray powder converter lime process does not allow further dephosphorization in the first phase of adding more than 4 ~ 6t lime, so there will be no guarantee that the full discharge of molten iron. Recently developed a new process that can add powdered lime in the first stage, especially at the very beginning, to reduce hot metal loss and accelerate dephosphorization. Because before this time, the massive lime has not begun to melt, and the last smelting residue is still in a hard state, that is, they can not be added to the dephosphorization reaction. The process includes the previous coal additive (2 ~ 5kg / t steel) smelting “burning.” Stabilized “burning” immediately after the powdered lime, then its maximum consumption. Lime is reduced when the oxidation of manganese and silicon has an effect on the temperature rise and the carbon oxidation reaction predominates and reaches the stable maximum oxidation rate (as dictated by the gas analyzer). From this point on, change the amount of powdered lime according to the amount of carbon oxide in the exhaust gas. The analysis of the obtained data shows that the new process can achieve higher process index. Test (A) and comparison (B) smelting indicators are shown in Table 1.