转炉脱磷及熔池氧化特性

为了改善脱磷,在实验室和工业转炉的基础上开展了一些试验.结果表明,在顶底吹条件下,搅拌强度、碳磷氧化反应转化温度、金属液碳含量和炉渣成分对脱磷有明显影响.用试验数据建立了一个包括碳含量和搅拌因素在内的磷分配比公式,并验证了一个脱磷反应速率方程.在考察熔池氧化性的同时,提出了一个支配铁氧化的吹炼指数来调整氧在炉渣和金属液之间的分配.在实际操作中,通过控制顶底吹条件和炉渣成分使脱磷和熔池中铁的过氧化均获得改善.

Dephosphorization in converters and oxidation characteristics of molten baths

On the basis of laboratory and industrial converters,some tests were carried out in order to improve dephosphorization in steelmaking. The results show that stirring intensity,conversion temperature of carbon-phosphorus oxidation reactions,carbon content of hot metal and slag compositions have significant effects on the dephosphorization under the top and bottom blowing conditions. A formula for the distribution ratio of phosphorus was established,which included carbon content and agitating factors,and a dephosphorization reaction rate equation was verified by test data. While the oxidizability of the molten bath was investigated,a blowing index for dominating the iron-oxidation in the molten bath was suggested to adjust the distribution of oxygen between slag and hot metal. In practical operations,both the dephosphorization and the peroxidation of iron in the molten bath were improved by controlling the top and bottom blown conditions and the slag compositions.