基于KR增硅和转炉加硅石造渣的低硅铁水脱磷技术  

Low silicon hot metal dephosphorization technology based on KR silicon increasing and converter slagging with silica

作　　者：边吉明 胡敏 刘鑫 杨建华 周朝刚 王书桓 BIAN Jiming;HU Min;LIU Xin;YANG Jianhua;ZHOU Chaogang;WANG Shuhuan(Steelmaking Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;Tangshan Special Metallurgy and Material Preparation Laboratory,Tangshan 063210,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司炼钢部,河北唐山063200 [2]华北理工大学冶金与能源学院,河北唐山063210 [3]唐山市特种冶金及材料制备重点实验室,河北唐山063210

出　　处：《炼钢》2021年第6期9-14,共6页Steelmaking

基　　金：唐山市人才资助项目(A201905001);国家自然科学基金资助项目(52074128)。

摘　　要：针对转炉低硅铁水炼钢过程中存在的热量不足和成渣困难导致脱磷率低下的问题,通过工业试验,研究不同硅含量铁水在冶炼过程中的终点温度、热剂-硅铁量、废钢及矿石用量关系,并结合KR增硅技术和转炉加硅石造渣技术。结果表明,在转炉中添加硅铁时,铁水的化学热少,炉内温度前期上升速率慢,石灰加入量少且不易熔化,不利于前中期脱磷和后期渣的形成,但硅铁在KR熔炼良好,吸收率接近100%;低硅铁水(w(Si)≤0.3%)的脱磷由82.3%增加至87.7%。Aiming at the low dephosphorization rate caused by insufficient heat and slag-forming difficulty in low silicon molten iron steel-making of converter,through industrial trials,the relationships among the temperature at end point of different hot metal silicon content in the smelting process,the amount of thermal agent-ferrosilicon,the amount of scrap and ore were studied,and the KR silicon increasing technology and converter slag-making technology of adding silica were combined.The results show that the chemical heat of hot metal is less when ferrosilicon is added into converter,and the furnace temperature rises slowly in the early stage.The addition amount of lime is less,and it is difficult to melt,which is bad for the formation of slag and dephosphorization process.However,ferrosilicon is well melted in KR device,and the absorption rate is close to 100%.The dephosphorization rate of the hot metal with low Si mass fraction(≤0.3%)increases from82.3%to 87.7%.This can provide a theoretical guidance and technical reference for the dephosphorization process of hot metal with low Si content.

关 键 词：低硅铁水 KR增硅 造渣 脱磷效果 

分 类 号：TF704.4[冶金工程—钢铁冶金]