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根据冶金熔体的共存理论,计算了CaO-MgO-MnO-FeO-SiO2-Al2O3六元渣系各组元的作用浓度。结合生产实际数据,建立了LF精炼过程中炉渣成分和钢水[Ca]之间氧化还原反应的数学模型,计算了炉渣成分对钢水[Ca]含量的影响。结果表明,LF精炼过程中钢水[Ca]含量受[Si]-(FeO)联合控制,渣中SiO2、FeO质量分数每增加1%,[Ca]质量分数分别降低1.63×10-6和1.55×10-6。为了将[Ca]质量分数控制在10×10-6以下,当FeO质量分数为3%左右时,碱度B应不高于0.9。
According to the coexistence theory of metallurgical melts, the action concentration of each component of CaO-MgO-MnO-FeO-SiO2-Al2O3 six yuan slag system was calculated. Combined with the actual production data, a mathematical model of the redox reaction between slag and molten steel [Ca] was established and the effect of slag composition on [Ca] content of molten steel was calculated. The results show that the content of [Ca] in molten steel is controlled by [Si] - (FeO) in LF refining process. The mass fraction of [Ca] decreases by 1.63 × 10-6 and 1.55 × 10-6. In order to control the mass fraction of [Ca] below 10 × 10-6, the basicity B should not be higher than 0.9 when the mass fraction of FeO is about 3%.