影响钢液回磷因素的研究

Study of Factors Affecting Liquid Steel Rephosphorization

为更好降低钢液的回磷量,结合南钢现场试验,通过计算分析了从转炉出钢到LF精炼结束的钢液总回磷量、下渣回磷量、合金回磷量、辅料回磷量,以及出钢条件对总回磷量和下渣回磷量的影响。试验结果表明：总回磷量由下渣回磷量、合金回磷量、辅料回磷量构成,其中合金回磷最大,辅料回磷影响最小,降低下渣回磷量可以有效减少总回磷量。出钢温度控制在1 620~1 640℃,钢液碳含量在0.028%~0.035%,出钢炉渣碱度在5左右,炉渣FeO含量在17%以上时可以有效抑制钢液总回磷量。当控制出钢温度在1 620~1 627℃,出钢炉渣碱度为5,炉渣FeO含量在23%左右时,可以有效降低下渣造成的回磷。

In order to effectively control liquid steel rephosphorization,the total rephosphorization quantity in liquid steel,by slag tapping,alloy additions、smelting fluxes had been calculated,and effect of tapping conditions on total rephosphorization and rephosphorization by slag was investigated in this paper.The calculation results showed that total rephosphorization originated from slag tapping,alloying addition and fluxes,where alloy made biggest contribution to total rephosphorization and fluxes the less effect. Besides,the combination of tapping control at 1 620 ~ 1 640 ℃,slag basicity at 5,0. 028% ~ 0. 035%carbon and more than 17% FeO effectively controlled the total rephosphorization quantity. When controlling slag basicity at 5,tapping temperature of 1 620 ~ 1 627 ℃,and ~ 23% FeO,the rephosphorization by slag trapping could be effectively reduced.