减轻低碳低磷钢冶炼炉衬侵蚀及炉渣成分优化

Optimization of slag content to alleviate lining erosion for low carbon low phosphorous steel

通过实验室管式高温炉蘸渣试验和理论计算,研究了转炉冶炼低碳低磷钢的终渣(FeO)含量、(MgO)含量和碱度对炉渣物化性能和溅渣护炉炉衬保护的影响。试验优化前,终炉渣(FeO)质量分数为31.5%,(MgO)质量分数为8%,通过调整炉渣碱度,炉渣的固相率依然接近0%,炉渣溅渣后难以残留在炉壁上,不能对炉衬起到保护的效果。通过试验及理论计算,在1 600℃条件下,炉渣固相率随着渣中(FeO)含量的增加而降低,随着炉渣碱度和(MgO)含量的增加而增加。降低(FeO)含量和提高(MgO)含量可以明显提高固相率。因此,将(FeO)质量分数控制为22.5%~27.0%,(MgO)质量分数控制为8%~12%,碱度控制为3.6左右时,终渣溅渣效果明显提升。

The influence of(FeO) content,(MgO) content and basicity of slag of low carbon and low phosphorous steel has been studied through laboratory high temperature experiments and theoretical calculation on physicochemical property of slag. The w(FeO) was 31.5% and w(MgO) was 8% before optimization, the solid phase ratio was near 0% whatever the slag basicity was. It was difficult to remain final slags at the lining of the BOF furnace after slag splashing, hence slag splashing could hardly protect the lining. At 1 600 ℃,the solid phase ratio decreased when(FeO) content increased, and the solid phase ratio increased with(MgO) content and basicity of slag raise. The low(FeO) content and high(MgO) content could help to increase the solid phase ratio. It is more appropriate for the slag that w(FeO) is about 22.5%-27.0%, w(MgO) is about 8%-12% and basicity is about 3.6.