SELF FLUXING PELLETS FOR CHARGING INTO THE BLAST FURNACE

Disclosed herein is a self-fluxing pellet to be charged into blast furnace, the pellets containing open pores of diameters larger than 5 mu m in an amount greater than 0.045 cm3/g. Calcium.ferrite structures with a thickness of 100 mu m or greater exist around pores of diameters larger than 5 mu m i...

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Bibliographische Detailangaben
Hauptverfasser:	KUNIHIKO TOKUTAKE, SHOJI SHIROUCHI, MITUTOSHI ISOBE, TAKESHI SUGIYAMA
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY FERROUS OR NON-FERROUS ALLOYS MANUFACTURE OF IRON OR STEEL METALLURGY METALLURGY OF IRON PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Disclosed herein is a self-fluxing pellet to be charged into blast furnace, the pellets containing open pores of diameters larger than 5 mu m in an amount greater than 0.045 cm3/g. Calcium.ferrite structures with a thickness of 100 mu m or greater exist around pores of diameters larger than 5 mu m including the open pores. The self-fluxing pellets as a whole has a CaO/SiO2 value higher than 0.8. For forming the self-fluxing pellets, at least one of coarse dolomite and limestone having a particle size of 44 mu m-1 mm is added as a pellet material to powdery iron ore. The green pellet formed from the resulting powdery mixture are sintered at a temperature of 1220 DEG C.-1300 DEG C. to have a CaO/SiO2 value higher than 0.8 after sintering.