Process for producing steel by converter

Details Process for producing steel by converter Process for producing steel by converter

C - Chemistry, Metallurgy

21

C

C21C 5/30 (2006.01)

Patent

CA 2166097

The present invention provides a process for efficiently dephosphorizing, dephosphorizing and decarbonizing, or desulfurizing, dephosphorizing and decarbonizing a hot metal in a converter. The amount of flux to be charged and the amount of bottom-blown gas are adjusted so that the bottom-blowing agitation power and the CaO/SiO2 ratio subsequent to the treatment become at least 0.1 kW/ton and from 0.7 to 2.5, respectively and the hot metal temperature at the treatment end point becomes from 1,200 to 1,450°C. Furthermore, the operation of the process is controlled so that the sum of a T.Fe concentration and a MnO concentration in the slag subsequent to the treatment becomes from 10 to 35% by weight by adjusting the top-blown oxygen feed rate, the flow rate of bottom-blown gas or the top-blowing lance height.

L'invention concerne un procédé efficace de déphosphoration, de déphosphoration-décarburation, ou de désulfuration-déphosphoration-décarburation de fer en fusion dans un convertisseur. Les débits d'alimentation en fondant et en gaz insufflé par le bas sont régulées de manière à obtenir une puissance d'agitation sous l'effet du gaz insufflé par le bas d'au moins 0,1 kW/t, un CaO/SiO2 de scories traitées de 0,7 à 2,5, et une température en un point terminal de traitement de 1200 DEG C à 1450 DEG C. Une opération de régulation est ensuite effectuée de sorte que la somme de la concentration de T.Fe et de MnO dans les scories traitées soit égale à 10-35 % en poids par régulation du débit d'alimentation en acide insufflé par le haut, du débit du gaz insufflé par le bas ou de la hauteur de la lance d'insufflation par le haut.

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