JPS5594420A - Steel making method of not discharging cao-base slag having decay characteristic - Google Patents

Steel making method of not discharging cao-base slag having decay characteristic

Info

Publication number
JPS5594420A
JPS5594420A JP257979A JP257979A JPS5594420A JP S5594420 A JPS5594420 A JP S5594420A JP 257979 A JP257979 A JP 257979A JP 257979 A JP257979 A JP 257979A JP S5594420 A JPS5594420 A JP S5594420A
Authority
JP
Japan
Prior art keywords
slag
molten iron
cao
base
molten
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP257979A
Other languages
Japanese (ja)
Inventor
Satomi Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP257979A priority Critical patent/JPS5594420A/en
Publication of JPS5594420A publication Critical patent/JPS5594420A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)

Abstract

PURPOSE:To avert the formation of a large amount of decayable slag by pre-dephosphorizing and desulfurizing raw material molten iron for steel making beforehand in a suitable range then separating the same from molten slag and charging it into a converter, refining the same to steel with a small amount of CaO-base slag and circulating the slag formed at that time to a blast furnace. CONSTITUTION:Molten iron is pre-dephosphorized and desulfurized to a range where dephosphorization and desulfurization may be done relatively easily, by Na2 CO3-base or CaO-base slag. At this time, the Si in the molten iron is let to remain relatively largely to suppress the extent of desiliconization. Next, this molten iron is separated from the molten slag and is charged into a converter, into which quicklime, fired dolomite, etc. are added as slag forming agents to make basic slag, thence C and residual P and S are oxygen-blown. At this time, the Si in the molten iron is oxidized to SiO2 and becomes slag of relatively low basicity, thus it becomes slag free from decay characteristic by water and since a large amount of FeO is also contained, the slag is suitably disintegrated after solidification and is returned to the blast furnace.
JP257979A 1979-01-13 1979-01-13 Steel making method of not discharging cao-base slag having decay characteristic Pending JPS5594420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP257979A JPS5594420A (en) 1979-01-13 1979-01-13 Steel making method of not discharging cao-base slag having decay characteristic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP257979A JPS5594420A (en) 1979-01-13 1979-01-13 Steel making method of not discharging cao-base slag having decay characteristic

Publications (1)

Publication Number Publication Date
JPS5594420A true JPS5594420A (en) 1980-07-17

Family

ID=11533272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP257979A Pending JPS5594420A (en) 1979-01-13 1979-01-13 Steel making method of not discharging cao-base slag having decay characteristic

Country Status (1)

Country Link
JP (1) JPS5594420A (en)

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