PRODUCTION OF MOLTEN STEEL BY USING VARIOUS KINDS OF IRON SOURCES

PURPOSE: To efficiently produce molten steel in one reaction vessel by re-charg ing a specific quantity of slag into a refining furnace after tapping the molten steel, supplying raw material, etc., and repeating smelting reduction process. CONSTITUTION: Iron raw material containing iron oxide as the...

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Bibliographische Detailangaben
Hauptverfasser:	IO YUKITO, OKUMURA KYOJI, SHIMA SHINJI, KATAYAMA HIROYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MANUFACTURE OF IRON OR STEEL METALLURGY METALLURGY OF IRON PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Beschreibung
Zusammenfassung:	PURPOSE: To efficiently produce molten steel in one reaction vessel by re-charg ing a specific quantity of slag into a refining furnace after tapping the molten steel, supplying raw material, etc., and repeating smelting reduction process. CONSTITUTION: Iron raw material containing iron oxide as the main component and carbonaceous material are added in a converter type metal refining furnace, and while supplying oxidizing gas, the smelting reduction to the iron oxide is executed under condition, in which the slag exists at 30-70wt.% to the molten iron at the time of being the max. quantity, to produce the pig iron containing >=3% carbon. Then, the produced slag is discharged at >=50% and stored in a separated vessel. The pig iron is decarburized by supplying the oxidizing gas in the same refining furnace. After tapping the produced molten iron, the stored slag is re-charged into the refining furnace at 50-80wt.%, and the smelting reduction is repeated by supplying the oxidizing gas while charging the iron raw material and the carbonaceous material. By this method, the molten steel can efficiently be produced by using fossil fuel and the iron oxide of ore, etc., or steel scrap.