JPS5623212A - Dephosphorizing and desulfurizing method of low silicon molten iron - Google Patents

Dephosphorizing and desulfurizing method of low silicon molten iron

Info

Publication number
JPS5623212A
JPS5623212A JP9862179A JP9862179A JPS5623212A JP S5623212 A JPS5623212 A JP S5623212A JP 9862179 A JP9862179 A JP 9862179A JP 9862179 A JP9862179 A JP 9862179A JP S5623212 A JPS5623212 A JP S5623212A
Authority
JP
Japan
Prior art keywords
molten iron
reaction
slag
dephosphorizing
composition
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.)
Granted
Application number
JP9862179A
Other languages
Japanese (ja)
Other versions
JPS5811485B2 (en
Inventor
Yasushi Nakamura
Kazumi Harashima
Yoshimori Fukuda
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 JP54098621A priority Critical patent/JPS5811485B2/en
Publication of JPS5623212A publication Critical patent/JPS5623212A/en
Publication of JPS5811485B2 publication Critical patent/JPS5811485B2/en
Expired 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)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PURPOSE:To accelerate dephosphorizing and desulfurizing reaction while suppressing decarbonization reaction, in a steel making refining process, by using the basic slag of the specific composition at relatively a low temp, and refining the molten iron siliconized. CONSTITUTION:Molten iron is beforehand refined by oxidation followed by decarbonizing and desiliconizing to decarbonize C content to a target value and make Si content at less than the value given by the following formula. Namely, the contg. SiA%<(15.5XCaO charge amount)/molten iron treatment amount. For the acceleration of dephosphorization reaction, the temp. of molten iron is made relatively low within a range of 1,300-1,450 deg.C, and dephosphorization reaction and desulfurization reaction are simultaneously accelerated by using the slag of the following composition: As the composition of the slag, 1 or two or more kinds of Mg F2, NaF, CaCl2, Na2CO3 are contained at 0.1-0.4pt.wt. based on 1pt.wt. of CaO and CaF2 is contained at 0.1-0.4pt.wt., to make the total of these <=0.7pt.wt., and iron oxide as an oxidizer of P is added to this.
JP54098621A 1979-08-03 1979-08-03 Dephosphorization and desulfurization method for low-silicon hot metal Expired JPS5811485B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54098621A JPS5811485B2 (en) 1979-08-03 1979-08-03 Dephosphorization and desulfurization method for low-silicon hot metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54098621A JPS5811485B2 (en) 1979-08-03 1979-08-03 Dephosphorization and desulfurization method for low-silicon hot metal

Publications (2)

Publication Number Publication Date
JPS5623212A true JPS5623212A (en) 1981-03-05
JPS5811485B2 JPS5811485B2 (en) 1983-03-03

Family

ID=14224613

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54098621A Expired JPS5811485B2 (en) 1979-08-03 1979-08-03 Dephosphorization and desulfurization method for low-silicon hot metal

Country Status (1)

Country Link
JP (1) JPS5811485B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5816006A (en) * 1981-06-17 1983-01-29 Kobe Steel Ltd Dephosphorizing method for molten iron
CN108588317A (en) * 2018-01-25 2018-09-28 河北龙凤山铸业有限公司 a kind of ultra-pure pig iron preparation system and preparation method
CN111363888A (en) * 2020-03-20 2020-07-03 莱芜钢铁冶金生态工程技术有限公司 KR desulfurizer as well as preparation method and application thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52105515A (en) * 1976-03-03 1977-09-05 Nippon Steel Corp Dephosphorization of molten pig iron

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52105515A (en) * 1976-03-03 1977-09-05 Nippon Steel Corp Dephosphorization of molten pig iron

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5816006A (en) * 1981-06-17 1983-01-29 Kobe Steel Ltd Dephosphorizing method for molten iron
JPS6123243B2 (en) * 1981-06-17 1986-06-05 Kobe Steel Ltd
CN108588317A (en) * 2018-01-25 2018-09-28 河北龙凤山铸业有限公司 a kind of ultra-pure pig iron preparation system and preparation method
CN108588317B (en) * 2018-01-25 2020-12-18 河北龙凤山铸业有限公司 Ultra-pure pig iron preparation system and preparation method
CN111363888A (en) * 2020-03-20 2020-07-03 莱芜钢铁冶金生态工程技术有限公司 KR desulfurizer as well as preparation method and application thereof

Also Published As

Publication number Publication date
JPS5811485B2 (en) 1983-03-03

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