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首钢京唐公司采用转炉铁水预处理脱磷工艺作为洁净钢生产平台,通过前期58炉冶炼实验,摸索出一套适和京唐公司生产实际的操作工艺,并在造渣制度、吹炼模式、温度控制等方面取得了重大突破,实现了稳定、高效生产低磷钢、超低磷钢的目标.脱磷炉终点磷的质量分数平均为0.017%,碳的质量分数为3.69%,脱磷炉终点平均温度为1350℃,并有10炉钢的脱磷炉终点磷的质量分数小于0.015%,最低为0.008%,达到了生产超低磷钢的预脱磷要求.对实验中影响脱磷效果的因素,如铁水硅含量,脱磷炉终点温度、终点碳含量、终渣碱度和氧化性等,进行了深入研究.分析表明当铁水硅的质量分数小于0.45%时,可以达到比较好的脱磷效果;脱磷炉的脱磷效果随终点温度的升高而逐渐变差,但为保证脱碳炉有足够的热量,脱磷炉终点温度控制范围为1350～1380℃;脱磷炉合理的碳含量范围应该在3.3%～3.8%之间;碱度控制在1.8～2.2即可满足脱磷炉的脱磷效果;通过增加矿石加入量,保持较高枪位可以提高冶炼过程渣中(FeO)含量,提高脱磷炉的脱磷效率.
Jingtang Shougang Iron and Steel Company using hot metal pretreatment dephosphorization process as a clean steel production platform, through the pre-58 furnace smelting experiments, worked out a set of practical Jingtang production company operating processes, and in the slagging system, blowing mode, Temperature control and other aspects, and achieved the goal of stable and efficient production of low-phosphorus steel and ultra-low-phosphorus steel.The average phosphorus content of the final dephosphorization furnace was 0.017% and the carbon content was 3.69% The average temperature at the end of 1350 ℃, and 10 furnace steel dephosphorization furnace end phosphorus content of less than 0.015%, a minimum of 0.008%, reached the production of ultra-low phosphorus steel dephosphorization requirements of the experiment dephosphorization effect , Such as the content of silicon in hot metal, the end temperature of the dephosphorization furnace, the carbon content in the end point, the alkalinity of the final slag and the oxidizability, etc. The results show that when the mass fraction of molten silicon is less than 0.45%, the better Dephosphorization effect; dephosphorization furnace dephosphorization effect with the endpoint temperature of the gradual deterioration, but to ensure that the decarburization furnace has enough heat, the end of the dephosphorization furnace temperature control range of 1350 ~ 1380 ℃; dephosphorization furnace reasonable The carbon content should be in the range of 3.3 % ~ 3.8%; Alkalinity control in 1.8 ~ 2.2 to meet the dephosphorization furnace dephosphorization effect; by increasing the amount of ore, to maintain a higher gun position can increase the smelting process slag (FeO) content, improve dephosphorization Furnace dephosphorization efficiency.