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Development of metallurgy in Russia and CIS
ArticleName State of converter bath in the starting period of top oxygen blowing
ArticleAuthor V. K. Yashchenko, V. P. Karasev

St. Petersburg State Polytechnical University (St. Petersburg, Russia):

Yaschenko V. K., Mag. Eng., Post-Graduate, the Chair "Metallurgical Technologies"
Karasev V. P., Cand. Eng., Ass. Prof., the Chair "Metallurgical Technologies"

E-mail (common):


The attempt to determine the condition of a converter bath surface before oxygen blowing using a cold modeling approach has been done. The model simulated a 350–400 ton basic oxygen furnace (BOF) with mass fraction of scrap as large as 110 tons. Basic dimensions of the internal converter chamber and its model are presented. Nine variants of lightweight and baled scrap load in different proportions have been tested. It was established that, after hot iron pouring, weight of scrap protruding above liquid surface depends on size and fraction of bales and can vary from 42.9 to 2.9 tons. In the meantime the level of liquid iron may increase from 2.0 to 2.8 m. It is recommended to take into account a bath surface condition for calculation of material and thermal balance; for setting an oxygen lance position at initial blowing step; for optimization of slag-formation and dephosphorizing. It is necessary to mention that this work took into consideration only scrap bales with their volume and mass corresponding to the technical parameters of national pressing equipment. But really these parameters can be lower that the required figures; in this case they usually increase amount of charged bales, but it leads to deterioration of the problem with protrusion of scrap. But initial state of converter bath surface can be evaluated using the technique described in the paper.

keywords 350–400 ton basic oxygen converters, scrap loading, cold modeling, weight of protruding scrap metal, baled scrap, liquid iron, top oxygen blowing

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