JPS57145916A - Divided refining method by reusing slag - Google Patents

Divided refining method by reusing slag

Info

Publication number
JPS57145916A
JPS57145916A JP3112481A JP3112481A JPS57145916A JP S57145916 A JPS57145916 A JP S57145916A JP 3112481 A JP3112481 A JP 3112481A JP 3112481 A JP3112481 A JP 3112481A JP S57145916 A JPS57145916 A JP S57145916A
Authority
JP
Japan
Prior art keywords
slag
stage
molten iron
post
refining
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
JP3112481A
Other languages
Japanese (ja)
Inventor
Yozo Takemura
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 JP3112481A priority Critical patent/JPS57145916A/en
Publication of JPS57145916A publication Critical patent/JPS57145916A/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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PURPOSE:To minimize the total production amt. of slag and to improve overall balance in divided type refining for molten iron by subjecting the slag produced in the converter refining in post stages to component control, reusing the same in prerefining and performing prescribed dephosphorization and desulfurization. CONSTITUTION:After molten iron 1 is subjected to a desiliconizing treatment, it is transferred to dephosphorizing and desulfurizing treatment 9 of a fore stage. In this stage, the combined slag 13 made by adding iron oxide to the steel making slag 11 obtd. in converter refining 12 of a post stage and controlling the components to 0.5-3.0 T.Ca%/T.Fe% is reused. Further, if necessary, lime 5 and steel making slag 6 are used in combination. In this fore stage, the molten iron components are prerefined to a 0.10-0.01% Si, 0.04-0.01% P and 0.005- 0.020 S range. Thence, a dephosphorizing agent or a dephosphorizing agent plus a desiliconizing agent are added to the molten iron by converter refining 12 in the post stage whereby it is removed of C, P, S and the volume of the slag 11 is controlled to 15-30kg/t-steel.
JP3112481A 1981-03-06 1981-03-06 Divided refining method by reusing slag Pending JPS57145916A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3112481A JPS57145916A (en) 1981-03-06 1981-03-06 Divided refining method by reusing slag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3112481A JPS57145916A (en) 1981-03-06 1981-03-06 Divided refining method by reusing slag

Publications (1)

Publication Number Publication Date
JPS57145916A true JPS57145916A (en) 1982-09-09

Family

ID=12322665

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3112481A Pending JPS57145916A (en) 1981-03-06 1981-03-06 Divided refining method by reusing slag

Country Status (1)

Country Link
JP (1) JPS57145916A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6393813A (en) * 1986-10-09 1988-04-25 Sumitomo Metal Ind Ltd Steel making method
JP2001240910A (en) * 2000-03-02 2001-09-04 Nippon Steel Corp Method for treating molten iron using decarburized slag

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5524487A (en) * 1978-08-11 1980-02-21 Kokoku Gomme Kogyo Kk High-sensitivity pressure sensitive resistor and manufature thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5524487A (en) * 1978-08-11 1980-02-21 Kokoku Gomme Kogyo Kk High-sensitivity pressure sensitive resistor and manufature thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6393813A (en) * 1986-10-09 1988-04-25 Sumitomo Metal Ind Ltd Steel making method
JPH0377246B2 (en) * 1986-10-09 1991-12-10 Sumitomo Metal Ind
JP2001240910A (en) * 2000-03-02 2001-09-04 Nippon Steel Corp Method for treating molten iron using decarburized slag

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