Abstract: Generally the converter end [Mn] of low manganese steel is required to control ≤0.05% , according to the issues of high flux consumption and inconstancy of removing manganese from liquid by traditional double slag process, based on thermodynamics and kinetics analysis and. data in production situ, the effect of slag basicity (R 1.68-2.00), temperature (1340-1460℃ ) and FeO content in slag-(FeO) (15.5%-18.7%) on ability of slag to remove manganese in liquid by remaining and double slag process is studied. With the measures including adding partial limestone in splashing and remaining slag period, at blowing beginning adding a small amount dolomite replace partial light burning dolomite and adding a small amount o£ fluorite, and in blowing initial period using higher level lance position to strengthen top slag stirring and speed up early period oxidation of manganese, the end [ Mn] decreases from ≤0.06% to ≤0.045% ； as compared with traditional double slag process, with optimized process the lime consumption of lime decreases by 6.5 kg/t, that of fluoride decreases by 1.48 kg/t and that of iron scale decreases by 6.42 kg/t, the steelmaking flux cost reduces obviously.

Key words: 90 t Converter, Remaining Slag, Double Slag, End Manganese Content, Flux Consumption

摘要： 低锰钢一般要求控制转炉终点[Mn]≤0.05%,针对传统双渣工艺熔剂消耗成本高,留渣双渣工艺去锰不稳定的问题,基于热力学、动力学分析和现场数据分析,研究了碱度炉渣（R 1.68~2.00）、温度（1340~1460℃）及渣中FeO含量（FeO）(15.5%~18.7%)对留渣双渣工艺中炉渣去锰能力的影响。通过溅渣留渣期间加入部分石灰石,吹炼开始加入少量生白云石替代部分轻烧白云石和加入少量萤石以及吹炼初期采用较高枪位,加强熔池上层炉渣搅拌加速初期锰的氧化等措施,使终点[Mn]由≤0.06%降至≤0.045%,与传统双渣法比较,减少石灰用量6.5 kg/t,减少萤石1.48 kg/t,铁皮单耗降低6.42 kg/t,明显降低冶炼熔剂成本。

关键词: 90t转炉, 留渣, 双渣, 终点锰含量, 熔剂消耗