C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
C21B 3/06 (2006.01) C21C 1/04 (2006.01)
Patent
CA 2299277
The invention relates to a method for desiliconizing pig iron before subsequent refining to steel. According to said method liquid steel slag is deposited onto the tapped molten pig iron slag and possibly the molten blast- furnace slag at a quantity corresponding to the silicon content of the pig iron and the iron and/or chromium oxide content of the slag after blast furnace tapping. The quantity of steel slag is chosen such that the silicon content of the pig iron is reduced to less than 0.5 weight % with a simultaneous increase in the SiO2 content of the slag and a reduction in the iron and/or chromium oxides of the liquid metal slag. The temperature of the slag iron bath is maintained at below 1,500 ~C.
Lors d'un procédé de désiliciage de fonte brute qui précède un affinage en acier, on dépose des scories d'acier liquide sur le bain de fonte brute coulée et éventuellement sur le bain de scories des hauts fourneaux, et ce dans une quantité correspondant à la teneur en silicium de la fonte brute et à la teneur en fer et/ou oxyde de chrome des scories après la coulée des hauts fourneaux. La quantité des scories d'acier est mesurée de telle façon que la teneur en silicium de la fonte brute est ramenée en-deçà de 0,5 % en poids pour une augmentation simultanée de la teneur en SiO¿2? des scories avec réduction des oxydes de fer et/ou de chrome des scories en métaux liquides. La température du bain de fer des scories est maintenue inférieure à 1500 ·C.
"holderbank" Financiere Glarus Ag
Marks & Clerk
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