Abstract: The commercial pilot production and analysis on replacing partial lime in slag by limestone in 60t BOF steelmaking at Tangsteel have been carried out. Results show that of heats with limestone replacement ratio 7%~33% the energy consumption saving is 1.45~6.90kg standard coal per ton steel by estimated calculation；with replacing partial lime by limestone the average end [P] is 0.02% and average dephosphorization rate is up to 83.13%；with tapping liquid temperature increasing the dephosphorization rate in heats replacing partial lime by limestone decreases that meets the law of thermodynamics；and compared with CaO charging amount 51.99kg per ton steel of heats by lime slagging, the CaO charging amount is 51.67kg per ton steel slagging by limestone to replace partial lime which shows no-obvious silicon volatile phenomenon.

Key words: 60t Top and Bottom Combined Blowing Converter, Limestone to Replace Partial Lime, Dephosphorization, Slagging, Steelmaking, Slag Amount

摘要： 对唐钢60t转炉石灰石替代部分石灰造渣炼钢进行工业试验和分析,结果表明,石灰石替代比在7%~33%时,估算吨钢节省能耗1.45~6.90kg标煤;石灰石替代部分石灰炉次终点钢水平均P含量为0.02%,脱磷率均值达到83.13%。同时出钢温度增加,石灰石替代部分石灰造渣炉次的脱磷率下降,符合热力学规律;石灰造渣炉次吨钢入炉CaO量为51.99kg,而石灰石替代部分石灰炉次的吨钢入炉CaO量为51.67kg,并无明显硅挥发现象。

关键词: 60t顶底复吹转炉, 石灰石替代部分石灰, 脱磷, 造渣, 炼钢, 渣量