EAF-LF炼钢流程中钢水回磷的热力学分析  

Thermodynamic Causes of Rephosphorization in EAF-LF Process for Steelmaking

作　　者：张贺艳[1] 姜周华[1] 梁连科[1] 王文忠[1] 刘晓[2] 顾文兵[2] 王军文[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]宝山钢铁股份有限公司,上海201900

出　　处：《钢铁研究学报》2003年第1期11-15,共5页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(50174012)

摘　　要：本文对钢水回磷进行了热力学计算和分析,得知EAF LF炼钢流程中钢水回磷的根本原因是熔池温度升高、炉渣氧化性减小和炉渣碱度降低,并针对宝山钢铁股份有限公司150tEAF炉冶炼钢管钢过程、定量计算了熔池温度、炉渣氧化性及炉渣碱度变化对钢水回磷量的影响。计算结果表明,在LF精炼的热力学条件下,渣中无磷存在;EAF下渣量及铁合金种类对LF精炼钢水回磷量也有影响,EAF每下渣100kg,钢水增磷0.00032%,锰铁合金的增磷作用大于硅铁合金。每加入1kg t锰铁合金使钢水增磷不少于0.0002%。由计算及分析可知,为防止钢水回磷必须密切关注EAF终点升温过程、严格控制EAF下渣量并采用低磷锰铁合金。The thermodynamic calculation is conducted. By analysing the determined causes of rephosphorization from thermodynamics in EAFLF process of steelmaking, it is found that increasing temperature, decreasing iron oxides in slag and lowering slag basicity will result in rephosphorization of molten steel, and the theoretical quantity of rephosphorization into molten steel in about 150 t EAF furnace of Baoshan Iron and Steel Co Ltd is also calculated according to the variation of temperature, amount of iron oxides and basicity of slag. The calculated results show that phosphorus can′t exist in LF refining slag. The effects of tapping slag and ferroalloy on the rephosphorizing amount are also discussed. Adding ferromanganese 1 kg per ton steel can cause rephosphorizing over 0.000 2 %, which is more than adding ferrosilicon, and the content of phosphorus increases 0.000 32 % with 100 kg tapping slag. In order to prevent rephosphorizing of EAFLF process, it is necessary to increasing temperature at EAF end, controlling oxidization slag into ladle and using ferromanganese with low phosphorus content.

关 键 词：EAF-LF炼钢 钢水回磷 回磷热力学分析 EAF下渣 回磷量 

分 类 号：TF701.1[冶金工程—钢铁冶金]