摘要
为了解决脱磷转炉熔渣中磷含量过高而不能直接实现转炉内循环利用的问题,在实验室进行了焦炭还原脱磷转炉熔渣热态试验,系统研究了不同碳当量、温度、碱度、FeO质量分数、氮气流量对气化脱磷率的影响规律。研究结果表明,试验采用2倍碳当量气化脱磷效果较好,气化脱磷率随着温度的升高而逐渐增加,1733K时气化脱磷率为68.6%;气化脱磷率随着碱度的降低而逐渐增加,当碱度控制为1.4时气化脱磷率可以达到45.6%;FeO质量分数在10%~30%范围变化时,气化脱磷率随着FeO质量分数的增加先升高后降低,FeO质量分数为25%时气化脱磷率最高可以达到43.5%。气化脱磷率随着氮气流量的增加先升高后降低,氮气流量为80L/h时,气化脱磷率为45.37%。由SEM分析结果可知,脱磷炉渣中的磷主要富集在硅钙富集区域,气化脱磷反应后微区内磷分布无特殊规律。
In order to solve the problem that the phosphorus mass percent in the dephosphorization converter slag is too high to directly realize the recycling in the converter,the hot state experiment of coke reduction dephosphorization converter slag was carried out in the laboratory,and the effects of different carbon equivalent,temperature,alkalinity,FeO mass percent,and nitrogen flow rate on the gasification dephosphorization rate were systematically studied.The results show that the gasification dephosphorization effect using the twice carbon equivalent is better,and the gasification dephosphorization rate gradually increases with the increase of temperature,reaching 68.6%at 1733 K;The gasification dephosphorization rate gradually increases with the decrease of alkalinity.When the alkalinity is controlled to 1.4,the gasification dephosphorization rate can reach 45.6%.When the FeO mass percent varies from10%to 30%,the gasification dephosphorization rate increases first and then decreases with the increase of FeO mass percent.When the FeO mass percent is 25%,the gasification dephosphorization rate can reach 43.5%.The gasification dephosphorization rate first increases and then decreases with the increase of nitrogen flow rate.When the nitrogen flow rate is 80 L/h,the gasification dephosphorization rate is 45.37%.From SEM analysis results,it can be seen that phosphorus in dephosphorization slag is mainly enriched in silicon and calcium enrichment areas,and there is no special rule of phosphorus distribution in micro-areas after gasification dephosphorization reaction.
作者
郭瑞华
王书桓
李晨晓
周朝刚
赵定国
陈虎
GUO Rui-hua;WANG Shu-huan;LI Chen-xiao;ZHOU Chao-gang;ZHAO Ding-guo;CHEN Hu(School of Metallurgy and Energy,North China University of Technology,Tangshan 063210,Hebei,China;Tangshan Special Metallurgy and Material Preparation Laboratory,Tangshan 063210,Hebei,China;Manufacturing Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2020年第9期118-124,共7页
Iron and Steel
基金
唐山市人才资助项目(A201905001)。
关键词
脱磷转炉
熔渣
气化脱磷
微观形貌
溅渣护炉
dephosphorization converter
slag
gasification dephosphorization
microscopic morphology
slag splashing for furnace protection
