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JPS579812A - Dephosphorizing method for pig iron containing chromium - Google Patents

Dephosphorizing method for pig iron containing chromium

Info

Publication number
JPS579812A
JPS579812A JP8392180A JP8392180A JPS579812A JP S579812 A JPS579812 A JP S579812A JP 8392180 A JP8392180 A JP 8392180A JP 8392180 A JP8392180 A JP 8392180A JP S579812 A JPS579812 A JP S579812A
Authority
JP
Japan
Prior art keywords
slag
compound
oxide
earth metal
pig iron
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
JP8392180A
Other languages
Japanese (ja)
Inventor
Shigeaki Maruhashi
Morihiro Hasegawa
Takashi Yamauchi
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 Nisshin Co Ltd
Original Assignee
Nisshin Steel Co Ltd
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 Nisshin Steel Co Ltd filed Critical Nisshin Steel Co Ltd
Priority to JP8392180A priority Critical patent/JPS579812A/en
Publication of JPS579812A publication Critical patent/JPS579812A/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
    • C21C1/025—Agents used for dephosphorising or desulfurising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (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 maintain high refining power and to reduce the expense of slag by specifically combining fluoride or chloride of an alkaline earth metal, Fe or Ni oxide, etc. with an Na or K compound to prepare slag while reducing the amount of the Na or K compound used. CONSTITUTION:Dephosphorization is performed with slag consisting of, by wt., 30-70% fluoride and/or chloride of an lakaline earth metal, 1.0-30% of >=1 kinds of compounds selected from oxides and carbonates of Na and K, 5-50% Fe and/or Ni oxide and 0-<40% oxide and/or carbonate of an alkaline earth metal. The Si content of molten pig iron contg. >=3% Cr is kept <=0.2wt% and brought into contact with said slag while inhibiting the oxidation of Cr. Si is oxidized preferentially and hinders the oxidation of P, so less Si is desired. Said slag has a low m.p. and high solubilizing power. It dissolves the Na or K compound stably, controls the evaporation loss of the compound, and increases the reaction efficiency considerably.
JP8392180A 1980-06-23 1980-06-23 Dephosphorizing method for pig iron containing chromium Pending JPS579812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8392180A JPS579812A (en) 1980-06-23 1980-06-23 Dephosphorizing method for pig iron containing chromium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8392180A JPS579812A (en) 1980-06-23 1980-06-23 Dephosphorizing method for pig iron containing chromium

Publications (1)

Publication Number Publication Date
JPS579812A true JPS579812A (en) 1982-01-19

Family

ID=13816061

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8392180A Pending JPS579812A (en) 1980-06-23 1980-06-23 Dephosphorizing method for pig iron containing chromium

Country Status (1)

Country Link
JP (1) JPS579812A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6297531A (en) * 1985-10-24 1987-05-07 オムロン株式会社 Electronic hemomanometer
JPS63262784A (en) * 1987-04-20 1988-10-31 Matsushita Electric Works Ltd Electronic pedometer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5284113A (en) * 1975-12-30 1977-07-13 Nisshin Steel Co Ltd Dephosphorising of molten pig iron containing cr

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5284113A (en) * 1975-12-30 1977-07-13 Nisshin Steel Co Ltd Dephosphorising of molten pig iron containing cr

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6297531A (en) * 1985-10-24 1987-05-07 オムロン株式会社 Electronic hemomanometer
JPH06113B2 (en) * 1985-10-24 1994-01-05 オムロン株式会社 Electronic blood pressure monitor
JPS63262784A (en) * 1987-04-20 1988-10-31 Matsushita Electric Works Ltd Electronic pedometer

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