基于多功能转炉炼钢法的连续循环冶炼过程

为了研究脱碳渣在脱磷期的重新利用,基于多功能转炉炼钢法进行连续循环冶炼实验.实验发现:脱磷阶段渣中较低的Fe O含量、吹炼5 min左右,C]≥2.8%的条件下,可实现转炉熔池内铁液P]≤0.025%的脱磷效果,并对低（Fe O）含量炉渣的脱磷可行性进行热力学计算;随着循环的进行,石灰加入量逐渐降低,由65 kg·t-1降低至31 kg·t-1,转炉冶炼终点钢水P]量由0.018%降低至0.005%,2~4炉后达到平衡状态;在循环过程中,脱磷阶段结束倒出炉渣60~80 kg·t-1,整个循环结束一次性倒出剩余全部炉渣120~130 kg·t-1,平均渣量为83 kg·t-1左右,较普通工艺的120 kg·t-1渣量有大幅度减少. 

Continuous circulating smelting process based on multi-refining converter melting technology

Continuous circulating smelting experiments based on multi-refining converter melting technology were performed to research the recycling of decarburized slag in the dephosphorization period. The results show that under the condition of low Fe O content,strong mixing,blowing for about 5 min andC] ≥ 2.8% in the dephosphorization stage,the content of phosphorus in molten metal is less than 0.025%. With the continuous circulating smelting,the consumption of lime decreases from 65 kg·t-1 to 31 kg·t-1,theP] content drops from 0.018% to 0.005%,and the smelting reaches equilibrium after 2-4 furnaces. During the smelting process,60-80 kg slag per ton steel is poured out at the end of the dephosphorization period,while 120-130 kg remaining slag per ton steel is poured out at the end of the loop. The average mass of slag is about 83 kg per ton steel,more less than 120 kg per ton steel in the ordinary process.