JPS56108813A - Pretreating method of molten iron - Google Patents

Pretreating method of molten iron

Info

Publication number
JPS56108813A
JPS56108813A JP966480A JP966480A JPS56108813A JP S56108813 A JPS56108813 A JP S56108813A JP 966480 A JP966480 A JP 966480A JP 966480 A JP966480 A JP 966480A JP S56108813 A JPS56108813 A JP S56108813A
Authority
JP
Japan
Prior art keywords
molten iron
treated
amount
blast furnace
furnace slag
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
JP966480A
Other languages
Japanese (ja)
Inventor
Kiichi Narita
Takehisa Makino
Nozomi Katagiri
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP966480A priority Critical patent/JPS56108813A/en
Publication of JPS56108813A publication Critical patent/JPS56108813A/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

Abstract

PURPOSE:To inexpensively obtain a molten iron pretreating material for dephosphorization, desiliconization, etc. by desulfurizing the blast furnace slag contg. CaO, SiO2, Al2O3, P2O5, at specific ratios thereby keeping its S amount at a value which does not exceed the specific ratio of the S amount of the molten iron to be treated. CONSTITUTION:The blast furnace slag contg. 25-50% CaO, 20-45% SiO2, 10- 20% Al2O3 and <=1% P2O5 is desulfurized. For example, it is desulfurized under oxygen vapor pressure kept at around 10<-4>-10<-5>, whereby its S content is reduced from about 0.8-1.7% to about 0.01-0.9%. This S amount should not exceed 10 times the S amount of the molten iron to be treated. Molten iron is desiliconized by using the thus treated blast furnace slag at about 10-20kg per ton of the molten metal. Thence, the molten metal is dephosphorized by using about 4.2kg the blast furnace slag based on, for example, about 100kg the molten iron. The treated molten iron is desulfurized by a conventional method, and this completes the pretreatment.
JP966480A 1980-01-29 1980-01-29 Pretreating method of molten iron Pending JPS56108813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP966480A JPS56108813A (en) 1980-01-29 1980-01-29 Pretreating method of molten iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP966480A JPS56108813A (en) 1980-01-29 1980-01-29 Pretreating method of molten iron

Publications (1)

Publication Number Publication Date
JPS56108813A true JPS56108813A (en) 1981-08-28

Family

ID=11726475

Family Applications (1)

Application Number Title Priority Date Filing Date
JP966480A Pending JPS56108813A (en) 1980-01-29 1980-01-29 Pretreating method of molten iron

Country Status (1)

Country Link
JP (1) JPS56108813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541310A1 (en) * 1983-02-18 1984-08-24 Lafarge Fondu Int Method for manufacturing steel-desulphurisation slag
JP2016011441A (en) * 2014-06-30 2016-01-21 Ｊｆｅスチール株式会社 Molten iron pretreatment method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541310A1 (en) * 1983-02-18 1984-08-24 Lafarge Fondu Int Method for manufacturing steel-desulphurisation slag
JP2016011441A (en) * 2014-06-30 2016-01-21 Ｊｆｅスチール株式会社 Molten iron pretreatment method

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