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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)。
In order to study the influence of hot metal flushing method on the dephosphorization effect of hot metal pretreatment, hot metal dephosphorization industrial test was carried out by pouring molten iron into a hot metal tank containing a certain amount of soda. The effects of Si, Ti concentration, hot metal temperature and soda dosage on the dephosphorization rate were investigated. The dephosphorization effect between calcium dephosphorization agent and soda was also compared. The results show that the low concentration of silicon and titanium, the low temperature and the proper consumption of soda contribute to the dephosphorization in the molten iron. Compared with the calcium dephosphorization agent, the dephosphorization and desulfurization ability of the soda is better than that of the dephosphorization agent In the meantime, the effect of oxygen on dephosphorization of soda was investigated. Oxygen was sprayed on the surface of molten iron to reduce the temperature drop of hot metal and provide space for the secondary pretreatment of hot metal. After secondary dephosphorization with soda hot metal, w [ P] <0.010%. The changes of w [Cr], w [V] and w [C] in the process of dephosphorization of soda were also investigated. The concentration of chromium in the molten iron was almost unchanged, almost all vanadium was oxidized into the slag, The carbon concentration decreased by about 0.2% (mass fraction, the same below).