WO2002101096A1 - Procede de pre-traitement d'un metal chaud de type convertisseur - Google Patents

Procede de pre-traitement d'un metal chaud de type convertisseur Download PDF

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Publication number
WO2002101096A1
WO2002101096A1 PCT/JP2002/005563 JP0205563W WO02101096A1 WO 2002101096 A1 WO2002101096 A1 WO 2002101096A1 JP 0205563 W JP0205563 W JP 0205563W WO 02101096 A1 WO02101096 A1 WO 02101096A1
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WO
WIPO (PCT)
Prior art keywords
converter
molten metal
refined
refining
molten
Prior art date
Application number
PCT/JP2002/005563
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English (en)
Japanese (ja)
Inventor
Keiji Shin
Masao Yamauchi
Syunsuke Nagata
Tamotsu Matsumura
Original Assignee
Nippon Steel Corporation
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 Corporation filed Critical Nippon Steel Corporation
Publication of WO2002101096A1 publication Critical patent/WO2002101096A1/fr

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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
    • 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

Definitions

  • the present invention relates to a dephosphorization scouring (hereinafter, referred to as de-P scouring) mainly for dephosphorization in a converter or a converter type steelmaking furnace (hereinafter, referred to as a converter), and a decarburization mainly for decarburization.
  • de-P scouring a dephosphorization scouring mainly for dephosphorization in a converter or a converter type steelmaking furnace (hereinafter, referred to as a converter), and a decarburization mainly for decarburization.
  • the present invention relates to a converter-type hot metal pretreatment method for refining (hereinafter referred to as de-C refining). Background art
  • hot metal pretreatment such as dephosphorization of hot metal
  • a torpedo car or the like that transports hot metal from a blast furnace to a converter.
  • techniques for hot metal pretreatment in converters are becoming widespread.
  • a plurality of converters as described in Japanese Patent Application Laid-Open No. 6-73425 are used, and one of the converters is used only for de-P refining and the other is used for de-P refining.
  • one converter as disclosed in Japanese Patent Application Laid-Open No.
  • Figure 3 shows an overview of the cycle time in the same furnace type hot metal pretreatment method.
  • the same furnace type hot metal pretreatment method after de-P scouring, after tapping the P-free iron into a pan, the pot is moved from the bottom of the furnace to the charging side, and the transportation time for lifting to the charging position is appear.
  • the converter performs waste after the tapping, and a non-operating time is generated from the end of the waste to the charging of the molten metal.
  • Fig. 4 shows an example of the refining schedule of a dedicated furnace type hot metal pretreatment method.
  • the cycle time from charging of de-P refining to waste is shorter than the cycle time of de-C refining. Therefore, in the dedicated furnace type hot metal pretreatment method, since the refining pitch of the P-removing furnace is matched with the pitch of the C-removing furnace, the non-operating time of the converter between the refining of the P-removing furnace is as shown in the figure. appear. Disclosure of the invention
  • the present invention provides a converter-type hot metal pretreatment method with high productivity that effectively utilizes the non-operation time of the converter.
  • the present invention has been made to solve the above problems, and the gist thereof is as follows.
  • a converter-type hot metal pretreatment method that performs de-P refining and de-C refining of molten metal
  • the P furnace is charged into the converter for de-C refining.
  • the converter is characterized in that the molten metal that has been removed or the molten metal that has been de-P treated in a converter or other similar equipment and that has been placed on standby in advance is charged into the converter and the C-refining is continued.
  • Furnace hot metal pretreatment method Furnace hot metal pretreatment method.
  • the molten metal charged into the converter is a molten metal (hereinafter, molten metal B) other than the molten metal (hereinafter, molten metal A) which has just been de-P scoured and discharged in the converter.
  • Converter type hot metal pretreatment method In the converter-type hot metal pretreatment method in which the molten metal that has been de-P-refined is de-C-purified in the converter after the molten metal is de-P-refined in the converter, for this reason, the molten metal charged into the converter is a molten metal (hereinafter, molten metal B) other than the molten metal (hereinafter, molten metal A) which has just been de-P scoured and discharged in the converter.
  • Converter type hot metal pretreatment method In the converter-type hot metal pretreatment method in which the molten metal that has been de-P-refined is de-C-purified in the converter after the molten metal is de-P-refined
  • the molten metal B charged into the converter for de-C refining is a molten metal that has been de-P-purified in the converter (hereinafter, molten metal A ') prior to the molten metal A.
  • molten metal A ' molten metal that has been de-P-purified in the converter
  • a converter-type hot metal pretreatment method in which the molten metal that has been de-P-purified is de-C-purified in the converter or another converter after the molten metal is de-P-refined in the converter and discharged.
  • the molten iron is charged into the converter or another converter, the ordinary converter is refined and the steel is removed, and then the P-refined molten metal is removed.
  • a converter-type hot metal pretreatment method characterized by charging and decarbonizing.
  • the converter-type hot metal pretreatment method for removing de-P-purified molten metal in a converter de-P-refining the molten metal in the converter-type hot metal pretreatment method.After that, ordinary hot metal is charged into the converter, and then ordinary converter refining is performed.
  • a method for preheating a converter type hot metal which comprises charging a molten metal (melt A) that has been de-P-refined in the converter and then discharged, and de-C-refined.
  • the molten iron is subjected to de-P refining in the converter or another converter.
  • the molten metal is de-P-refined and discharged.
  • the molten metal (Molten A) is charged into another converter and de-C-refined, and ordinary molten iron is charged into the converter.
  • a converter-type hot metal pretreatment method characterized by charging a molten metal (melt C) that has been de-P-purified in another converter, and then de-C-refined after the steel has been refined in a converter.
  • the molten metal is de-P-refined in the converter or another converter.
  • At least one of the converters is a converter for de-P, and the other converter is a converter for de-C.
  • De-P refining is continuously performed in the P-removal converter, and when the non-operating time of the P-removal converter exceeds the cycle time required for ordinary hot metal refining, the P-removal is performed.
  • a converter-type hot metal pretreatment method characterized by performing ordinary converter refining in a converter.
  • the molten metal is de-P-refined in the converter or another converter. At least one of the converters is a converter for de-P, and the other converter is a converter for de-C. At the same time, the de-P refining is performed, and the molten metal that has been de-P-refined in the de-C converter is (Molten A). The molten metal (Molten C) de-P refined in the P-removing converter is alternately charged and de-C refined, and the P-removing converter performs de-P refining.
  • a converter-type hot metal pretreatment method characterized by performing ordinary converter refining for refining ordinary hot metal.
  • the molten metal de-P-refined in the C-free converter and the molten metal de-P-refined in the P-free converter are alternately charged into the C-free converter.
  • the de-C-removing converter de-P-refined the molten metal (melt C) that has been de-P-refined in the P-removing converter, and then de-P-refined in the de-C-removing converter.
  • FIG. 1 is a diagram showing an embodiment of the converter type hot metal pretreatment method of the present invention. (Part 1 )
  • FIG. 2 is a diagram showing an embodiment of the converter type hot metal pretreatment method of the present invention. (Part 2)
  • FIG. 3 is a diagram showing a refining cycle of the same furnace type.
  • FIG. 4 is a diagram showing a refining schedule of a dedicated furnace type. BEST MODE FOR CARRYING OUT THE INVENTION
  • the present invention deals with the following method.
  • the de-P-refined molten metal is separately kept at the charging position of the converter, and Immediately after the de-P scouring in the furnace is completed and the discharge of the converter is completed, the separately de-P-purified molten metal (Molten B) that has been put on standby is charged into the converter, and C scouring.
  • molten A refers to the charge refined in the converter.
  • the molten metal removed from the molten metal is continuously removed in the converter.
  • the molten metal A other than the molten metal charged into the converter for de-C refining, which is de-P-refined in the converter and discharged (hereinafter, molten metal A)
  • the other molten metal hereinafter, “Molten B”. This allows the converter to operate effectively while the molten metal A de-P-purified in the converter is moving for recharging.
  • the other molten metal B charged to the converter for de-C refining is added to the molten metal A.
  • the molten metal was de-P-refined in the converter (hereinafter referred to as molten metal A ').
  • the other molten metal B charged into the converter for de-C purification is Molten metal that has been de-P scoured in another converter (hereinafter, molten metal C).
  • the operation rate in the converter can be increased, Also, this method can be performed mutually between a plurality of converters. That is, in claim 5, as shown in pattern 2 of FIG. 1, after the molten metal was removed from the melt in the converter, the molten metal was discharged, and then the molten metal was removed from the melt in the converter or another converter.
  • the molten metal is de-P-refined in the converter and discharged, and then de-P-refined in another converter to discharge the molten metal.
  • the molten metal (Molten C) is charged and de-C scouring is performed, and the molten metal (Molten A) de-P scoured and discharged in the converter is charged into another converter and de-molten. C to refine. In this way, multiple converters can mutually increase efficiency.
  • the de-P-purified molten metal that is de-C-purified in the converter is converted into the molten metal of the charge (
  • the molten metal that is de-C-purified in the converter is de-P-purified in another converter.
  • the molten metal de-P-purified in the converter is de-C-purified in another converter, thereby eliminating the non-operating time caused when the de-P-purified molten metal is transported to the charging position. Things.
  • the non-operating time caused by this transportation is replaced with the use of ordinary molten iron instead of the separate introduction of the P-refined molten metal and the removal of the C-refining, followed by ordinary converter refining.
  • claim 6 is a converter-type hot metal reserve in which the molten metal that has been de-P-refined is de-C-refined in the converter or another converter after the molten metal is de-P-refined in the converter and discharged.
  • ordinary hot metal is charged into the converter or another converter, ordinary converter refining and tapping, and then de-P refining.
  • the molten metal is charged and decarbonized.
  • This method can respond by placing ordinary hot metal on standby as necessary, which is extremely useful for eliminating downtime. In addition to being effective, it is also effective in controlling slag contamination as described below.
  • ordinary converter refining means refining ordinary molten iron into molten steel in a converter (also abbreviated as N refining).
  • ordinary hot metal means hot metal that is not subjected to P removal treatment.
  • claim 7 is a converter-type hot metal pretreatment method in which after the molten metal is de-P-refined in the converter and the molten metal is discharged, the de-P-refined molten metal is further de-C-refined in the converter. After de-P refining and tapping, the molten metal is continuously charged with the ordinary molten iron into the converter, and then subjected to ordinary converter refining and tapping. (Molten A) is charged and decarbonized.
  • the above method can be performed between a plurality of converters.
  • claim 8 is a hot metal pretreatment for removing the P from the molten metal in the converter and discharging the molten metal, and then removing the de-P-purified molten metal from the molten metal in the converter or another converter.
  • the molten metal is removed from the furnace by de-P refining, and the molten metal is supplied to another converter.
  • ordinary molten iron is charged into the converter, and the ordinary converter is refined. Then, the molten metal (Molten C) that has been de-P scoured in another converter is charged, and de-C scouring is performed. It is what you do.
  • One of the furnaces (B furnace in pattern 2 in Fig. 1) removes P and scours the molten metal, and supplies the molten metal to another converter (A furnace in pattern 2 in Fig. 1) to remove C.
  • the converter After the slag is discharged, ordinary hot metal that has been previously placed in a standby position at the charging position of the converter is charged, the ordinary converter is refined, and tapping is performed. Next, in the converter, the molten metal de-P-purified in another converter is charged and de-C-purified. This processing pattern is performed in each furnace.
  • the invention of claim 9 is a hot metal pretreatment in which the molten metal de-P-refined in the converter or another converter is de-C-refined in the converter or another converter.
  • a converter-type hot metal pretreatment method of a dedicated furnace type in which at least one of the multiple converters is used as a converter for removing P and the other converter is used as a converter for removing C,
  • the P removal is continuously performed, and when the non-operating time of the P removal converter is longer than the cycle time required for ordinary converter refining of the normal molten iron, the P removal is performed.
  • the furnace is used for ordinary converter purification.
  • this is a converter for de-C conversion (A furnace).
  • the de-P converter In the converter for de-P (B furnace), the de-P converter is continuously de-C-purified, and the non-operating time is concentrated.
  • the normal converter refining In the mining, the normal converter refining is sandwiched between the de-P refining. As a result, it is possible to effectively contribute to the production of non-operating time due to the difference in cycle time between de-P scouring and de-C scouring.
  • the P-removing converter (B furnace) continuously performs 5 charges of P-free refining, and the cycle time difference from C-free refining accumulates. Since non-operating time for one ordinary converter refining is generated, one ordinary converter refining can be performed for every five charges after de-P refining, and the non-operating time can be eliminated.
  • the normal furnace converter 1 charge was applied to the hot metal pretreatment 5 charges.
  • the continuous converter (CC) that receives the refined molten copper If the continuous steelmaking machine (CC) that receives the hot metal pretreated molten steel, that is, the low phosphorus steel, is separated, the number of charges supplied to the two continuous steelmaking machines will be unbalanced.
  • claim 10 is a special furnace type in which the hot metal pretreatment is performed by using at least one of the plurality of converters as a converter for removing P and the other converter as a converter for removing C.
  • the de-P refining is performed also in the de-C converter, and the molten metal de-P-purified in the de-C converter is added to the de-C converter.
  • the de-C converter (A furnace) mainly performs de-C refining and de-P refining at any time.
  • the converter for C removal is a dedicated furnace that mainly performs C removal, but unlike pattern 3 in Fig. 1, P removal is also performed at an arbitrary timing. Therefore, in the outline of pattern 4 in Fig. 2 and pattern 4-2 in Fig. 2 described later, it is treated as the same furnace and described as the same furnace-dedicated furnace mixture.
  • the pattern for removing P from the C-removing furnace side is defined as follows.
  • the molten metal removed in the P-removing converter and in the converter for removing C are removed.
  • the molten metal is charged alternately to remove C.
  • the processing ratio of the ordinary steel and the low-phosphorus steel is almost the same.
  • the non-P converter may have a non-operating time. In such a case, priority should be given to the molten metal that has been de-P-refined in the P-P converter.
  • the molten metal de-P-purified in the C-free converter and the molten metal de-P-purified in the P-free converter are alternately placed in the C-free converter in claim 10.
  • the molten metal de-P-refined in the de-P converter is de-C-refined, and then the temporarily-removed de-C converter is placed. It is a process in which molten metal (Molten A ') that has been de-P-purified in a furnace is charged and de-C-purified. This is because, as shown in pattern 4-2 in Fig.
  • the molten metal that has been de-P-refined in the C-removal converter is temporarily placed, and the molten metal is removed by the P-removal converter.
  • P Refined molten metal (Molten C) Is charged, de-C refining and tapping are performed, and then the temporarily placed de-P-purified molten metal (Molten A,) is de-C refined.
  • Molten C the temporarily placed de-P-purified molten metal
  • the point of the present invention is that the hot metal is removed from the molten P
  • the other furnace is charged with the de-P molten metal of another charge and de-C refined, or the molten iron is de-P refined, and then the de-P molten metal is discharged, and then the converter is put into the converter.
  • normal molten iron is charged, the converter becomes a normal converter, copper is removed, and then other molten metal from other channels is charged and decarbonized.

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

Abstract

La présente invention concerne un procédé permettant de pré-traiter un métal chaud de type convertisseur présentant une productivité plus élevée. L'invention concerne un procédé de pré-traitement d'un métal chaud de type convertisseur permettant le raffinage par extraction de P et le raffinage par extraction de C d'un métal fondu. Selon ce mode de réalisation, lors du raffinage par extraction de C, le métal fondu dont le P a été extrait par le convertisseur qui est chargé dans le convertisseur servant au raffinage par extraction de C, ou le métal fondu placé préalablement en réserve et dont le P a été extrait dans plusieurs autres convertisseurs ou équipements similaires, est chargé dans le convertisseur afin de poursuivre le raffinage par extraction de C.
PCT/JP2002/005563 2001-06-06 2002-06-05 Procede de pre-traitement d'un metal chaud de type convertisseur WO2002101096A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-171543 2001-06-06
JP2001171543A JP4718722B2 (ja) 2001-06-06 2001-06-06 転炉型溶銑予備処理方法

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WO2002101096A1 true WO2002101096A1 (fr) 2002-12-19

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WO (1) WO2002101096A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6520255B2 (ja) * 2015-03-17 2019-05-29 日本製鉄株式会社 転炉の操業方法
JP6492820B2 (ja) * 2015-03-17 2019-04-03 新日鐵住金株式会社 転炉の操業方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0641624A (ja) * 1992-07-22 1994-02-15 Nkk Corp 製鋼方法および製鋼設備

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0211714A (ja) * 1988-06-28 1990-01-16 Sumitomo Metal Ind Ltd 転炉の操業方法
JP2925371B2 (ja) * 1991-08-06 1999-07-28 三菱電機株式会社 ファイバ形光増幅器
JP3379113B2 (ja) * 1992-08-26 2003-02-17 日本鋼管株式会社 転炉製鋼法
JP3486887B2 (ja) * 1997-03-05 2004-01-13 Ｊｆｅスチール株式会社 複数の転炉を使用する製鋼方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0641624A (ja) * 1992-07-22 1994-02-15 Nkk Corp 製鋼方法および製鋼設備

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JP4718722B2 (ja) 2011-07-06
JP2002363630A (ja) 2002-12-18

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