复吹转炉底吹气体对钢水终点氮含量的影响

The Effect of Bottom Blowing Gas from the Combined Blown Converter on Nitrogen Content in Molten Steel End Point

在50 t顶底复吹转炉双渣法冶炼提钒后高磷铁水的工艺条件下,进行了全程底吹氮气(供气强度为0. 045 m3/min. t和0. 02m3/min. t),以及使用氩气底吹时钢水终点氮含量的对比试验,得出使用三种底吹气体的钢水终点氮含量分别为80 PPm、40 PPm、30 PPm,同时说明在氩站、连铸工序不宜使用氮气,这也是钢水氮含量大幅增加的原因之一。

Under the process conditions of high phosphorus hot metal after vanadium recovery by double slag process in 50t bottom reblowing converter,the bottom blowing of nitrogen （ gas supply intensity is 0 045 m3/ min· t and 0 02 m3/ min. t）in the wholeprocess is carried out,and the contrast test of nitrogen content in molten steel end point by argon blowing is carried out,the results of nitrogen content in molten steel end point by three kinds of gases separately are 80PPm, 40 PPm, 30PPm,it shows nitrogen is unsuitable for argon station and continuous casting process,using nitrogen is one of the reason that nitrogen content greatly increased in molten steel.