转炉半钢冶炼脱磷技术研究

针对攀钢转炉半钢炼钢存在的成渣慢,脱磷率低,炉后回磷大的问题,通过对造渣工艺、供氧、复吹底部供气、终点控制等多方面技术的优化,提高了转炉脱磷率。生产实践表明,采用转炉单渣法冶炼平均脱磷率达到了90%以上,转炉终点磷可稳定控制在0.007%以下,炉后回磷在0.003%以下,满足了成品[P]≤0.010%的低磷钢的生产需求。

Study on Technologies of Dephosphorization during Semisteel Smelting in Converter

To address the problems occurring during semisteel smelting in converter in Pangang,such as slow slagging,low rate of dephosphorization,and high rate of rephosphorization after converter smelting,corresponding measures have been taken to optimize slagging process,oxygen supply,bottom argon supply,and end-point control.With these countermeasures,the dephosphorization rate has been significantly increased.The production practice shows that the average dephosphorization rate is above 90% with single-slag process.In addition,the final phosphorus content can be controlled below 0.007%,and the rephosphorization rate after converter smelting can be controlled below 0.003%,satisfying the requirement for [P] controlled below 0.010% for steel products.