JPS57149407A - Dephosphorization of molten metal - Google Patents

Dephosphorization of molten metal

Info

Publication number
JPS57149407A
JPS57149407A JP3465681A JP3465681A JPS57149407A JP S57149407 A JPS57149407 A JP S57149407A JP 3465681 A JP3465681 A JP 3465681A JP 3465681 A JP3465681 A JP 3465681A JP S57149407 A JPS57149407 A JP S57149407A
Authority
JP
Japan
Prior art keywords
pig iron
nozzle
caco3
molten pig
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
JP3465681A
Other languages
Japanese (ja)
Inventor
Shozo Mizoguchi
Takemasa Ono
Toshiyuki Kaneko
Tatsuro Kuwabara
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 JP3465681A priority Critical patent/JPS57149407A/en
Publication of JPS57149407A publication Critical patent/JPS57149407A/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 effectively dephosphorize molten metal (pig iron) without causing any damage to nozzle by molten metal by blowing a specific amount of CaCO3 as a dephosphorizer by oxygen gas from the nozzle. CONSTITUTION:In the dephosphorization of molten pig iron, powdered CaCO3 as a dephosphorizer is blown into the molten pig iron, together with oxygen as a carrier gas, through a dip nozzle. The amount of CaCO3 used is 10kg or more/ ton of molten pig iron and 40kg or less/kg of the P content of molten pig iron in the early period, and also the amount of oxygen as a carrier gas used is 1/9 or more of the amount of CaCO3 used. Thus, damage to the nozzle by molten pig iron can be prevented because the nozzle is cooled by endothermic reaction caused on the thermal decomposition of CaCO3 into CaO and CO2 in the molten pig iron, and also the dephosphorization reaction of the molten pig iron can be effectively advanced because P oxides can be effectively slagged by CaO following the oxidation of P by CO2.
JP3465681A 1981-03-12 1981-03-12 Dephosphorization of molten metal Pending JPS57149407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3465681A JPS57149407A (en) 1981-03-12 1981-03-12 Dephosphorization of molten metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3465681A JPS57149407A (en) 1981-03-12 1981-03-12 Dephosphorization of molten metal

Publications (1)

Publication Number Publication Date
JPS57149407A true JPS57149407A (en) 1982-09-16

Family

ID=12420479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3465681A Pending JPS57149407A (en) 1981-03-12 1981-03-12 Dephosphorization of molten metal

Country Status (1)

Country Link
JP (1) JPS57149407A (en)

Similar Documents

Publication Publication Date Title
NZ335477A (en) Steel slag and ferriferous material reprocessing process comprising adding a silicon dioxide containing material to the slag to adjust the calcium oxide/silicon dioxide ratio useful to produce pig iron and environmentally compatible slags
ES8101648A1 (en) Converter steelmaking process.
JPS57149407A (en) Dephosphorization of molten metal
JPS52105515A (en) Dephosphorization of molten pig iron
JPS5735604A (en) Pretreatment of hot iron
JPS5798617A (en) Dephosphorizing method for molten pig iron
JPS5565313A (en) Steel manufacture with top blown oxygen
GB1363770A (en) Continous process for producing copper
JPS5591926A (en) Preparation of extremely low carbon nitrogen stainless steel
JPS5747807A (en) Simultaneous dephosphorization and desulfurization method for molten iron
JPS5582717A (en) Charging method for granular slag-making agent to reaction furnace
JPS5576013A (en) Al adding method to molten steel
JPS55107715A (en) Blowing method of dephosphorizer to bottom blowing converter
JPS5261109A (en) Converter operation method
JPS5773107A (en) Method foe improving dephosphorization efficiency of molten iron
JPS5437020A (en) Desulfurizing of molten crude iron
SE8101051L (en) BOTTOM NOZZLE
JPS56146811A (en) Dephosphorizing method for molten steel
JPS5371696A (en) Improving method for blocking yield of steel-making slag
JPS5792115A (en) Dephosphorization method for molten iron
JPS5681640A (en) Dipped tuyere cooling method
JPS5390118A (en) Steel-making method using formed synthetic slag and resulting indecreased amount of slag discharged
JPS5311113A (en) Desulfurization method
Gatellier et al. Hot Metal Pretreatment Studies Performed by IRSID
JPS5387918A (en) Refining method for low nitrogen steel