METHOD FOR MANUFACTURING LOW-PHOSPHORUS MOLTEN PIG IRON

METHOD FOR MANUFACTURING LOW-PHOSPHORUS MOLTEN PIG IRON

PROBLEM TO BE SOLVED: To reduce a quantity of slag formation as far as possibly along with effectively removing phosphorus, and to reduce an additive quantity of CaF2. SOLUTION: When manufacturing low-phosphorus molten pig iron, by adding a smelting agent as an oxygen source and a CaO source into a...

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Bibliographische Detailangaben
Hauptverfasser: SAKURAI EIJI, TAKEHAMA RYOHEI, TANO MANABU, KODAIRA SATOSHI, MATSUNO EIJU, MURAI TAKESHI, KAWABATA RYO
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
METALLURGY
METALLURGY OF IRON
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL
TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Zusammenfassung:PROBLEM TO BE SOLVED: To reduce a quantity of slag formation as far as possibly along with effectively removing phosphorus, and to reduce an additive quantity of CaF2. SOLUTION: When manufacturing low-phosphorus molten pig iron, by adding a smelting agent as an oxygen source and a CaO source into a vessel having retained the molten pig iron to remove phosphorous, this method comprises removing phosphorus by spraying gaseous oxygen and at least a part of the smelting agent onto the bath surface of the molten pig iron through a top- blowing lance, and controlling a basicity of slag after removing phosphorus so as to be higher than 2.5. COPYRIGHT: (C)2004,JPO