苏打脱磷剂冲罐法铁水脱磷

为研究铁水冲罐法对铁水预处理脱磷效果的影响,向放有一定量苏打的铁水罐中倒入铁水进行铁水脱磷工业试验研究。考察了铁水中Si、Ti浓度、铁水温度以及苏打添加量对脱磷率的影响,并比较了钙系脱磷剂与苏打的脱磷效果。结果表明：铁水中低的硅、钛浓度、低温以及适当的苏打消耗量有助于脱磷;与钙系脱磷剂只有一定的脱磷能力相比,苏打有较强的脱磷和脱硫能力;同时考察了氧气对苏打脱磷效果的影响,向铁水表面喷吹氧气可以减少铁水温降,为铁水的二次预处理提供温降空间,采用苏打铁水二次脱磷后,得到了w[P]〈0.010%的铁水;还考察了苏打脱磷过程中w[Cr]、w[V]和w[C]的变化,铁水中铬浓度几乎不变,钒几乎全部被氧化进入渣中,而碳浓度大约减小了0.2%（质量分数,下同）。

Practice and Analysis on Dephosphorization of Hot Metal by Soda Ash Through Pouring Hot Metal Method

In order to study the influence of pouring hot metal method on dephosphorization effect,some industrial dephosphorization test,which was pouring hot metal into ladle contained a certain amount of soda ash,were carried.The influence of w+w in hot metal,dosage of soda ash and hot metal temperature on dephosphorization rate was investigated and the comparison of dephosphorization effect between soda ash and Ca-dephosphorization agent was also investigated.The results show that low content of Si,Ti,proper dosage of soda ash and low temperature are in favor of dephosphorization.Compared with Ca-dephosphorization agent′s limited dephosphorization ability,soda ash has a higher ability in dephosphorization and desulfuration.Moreover,the influence of oxygen on dephosphorization using soda ash as dephosphorization agent was also investigated,it is found that blowing oxygen can decrease temperature drop,which guarantee smooth progress of re-dephosphorization.The phosphorus content of less than 0.010%(mass percent) was obtained.Meanwhile,the changes of w[C],w[V] and w during pretreatment were also studied.Result shows that w almost remain unchanged,w[C] reduces about 0.2%,while w[V] decreases to 0.