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WO2018146754A1 - Procédé de régulation moussage de laitier - Google Patents

Procédé de régulation moussage de laitier Download PDF

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Publication number
WO2018146754A1
WO2018146754A1 PCT/JP2017/004613 JP2017004613W WO2018146754A1 WO 2018146754 A1 WO2018146754 A1 WO 2018146754A1 JP 2017004613 W JP2017004613 W JP 2017004613W WO 2018146754 A1 WO2018146754 A1 WO 2018146754A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
pan
converter
discharged
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.)
Ceased
Application number
PCT/JP2017/004613
Other languages
English (en)
Japanese (ja)
Inventor
政樹 宮田
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 and Sumitomo Metal 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 and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Priority to CN201780082285.XA priority Critical patent/CN110139938A/zh
Priority to KR1020197018163A priority patent/KR20190089018A/ko
Priority to PCT/JP2017/004613 priority patent/WO2018146754A1/fr
Publication of WO2018146754A1 publication Critical patent/WO2018146754A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C21C5/30—Regulating or controlling the blowing
    • 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
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories

Definitions

  • the present invention particularly relates to a method for suppressing the slag discharged to the slag pan after hot metal treatment from forming (foaming) in the slag pan.
  • FeO (iron oxide) in the slag reacts with C in the molten iron, or FeO in the slag reacts with C in the granular iron contained in the slag.
  • a large amount of fine CO bubbles may be generated and form.
  • the forming in the slag pan is suppressed or quickly settled down. It is necessary to.
  • a technique for suppressing forming or quickly calming down and maintaining the calmed state is indispensable.
  • said dephosphorization and slopping can be suppressed by increasing the amount of CaO used by decarburization blowing after exhausting.
  • the amount of slag having a high CaO concentration is increased, which is not preferable from the viewpoint of not only the refining cost but also the slag treatment.
  • Patent Document 2 discloses a calming method in which carbon powder is sprayed onto a forming slag at a rate of 5 to 100 kg / min. Since carbon is difficult to wet with slag, when carbon powder is blown into the forming slag, coalescence and floating separation of fine CO bubbles are promoted through the carbon powder, so that the forming is calmed down.
  • Patent Document 3 discloses a method of spraying sprayed water on the surface of the slag in the slag pan as a method for suppressing slag forming in the slag pan. It is said that forming can be suppressed by cooling and solidifying the slag surface layer in the slag pan.
  • the present invention provides a slag forming suppression method that efficiently suppresses foaming without extending the slag discharge time when discharging slag from a converter to a waste ladle. With the goal.
  • the present inventor has found that the above problem can be solved by introducing water and crushed slag, which are inexpensive and easily available, with simple equipment into the slag pan as a forming inhibitor. Completed the invention.
  • the present invention is listed below. (1) After the hot metal treatment is performed in the converter, the molten slag is discharged from the converter to the discharge pan at a rate of 3 tons or more per minute, and after the discharge starts until the end of the discharge.
  • the molten slag discharged from the converter from 50.0 kg to 200 kg per minute of water from above the drain pan and 50.0 kg to 200 kg of crushed slag having a particle size of 5.0 mm to 30 mm per minute.
  • crushed slag is at least one selected from the group consisting of desiliconized slag, hot metal dephosphorized slag, converter slag, and ladle slag. Suppression method.
  • the slag discharge time is not extended and the forming can be efficiently suppressed.
  • FIG. 1 is a diagram for explaining a method of suppressing slag forming in the slag pan.
  • FIG. 1 is a view for explaining a method of suppressing slag forming in the slagging pan 2.
  • the example shown in FIG. 1 shows an example in which molten slag is discharged from the converter 1 to the discharge pan 2 in the multi-function converter method.
  • the converter 1 is tilted while the hot metal remains in the converter 1, and melted from the furnace port 3 of the converter 1 to the slag pan 2 installed below the converter 1.
  • Slag is discharged, for example, 12t to 14t.
  • the molten slag surface It is necessary to put the molten slag surface in a range where the surface of the slag is flowing vigorously.
  • the range is an area surrounded by a circumference 1 m away from the outer circumference of the slag flow at the position where the molten slag flow arrives.
  • the formation of molten slag in the waste pan 2 is suppressed.
  • the molten slag was discharged for about 3 minutes.
  • the mass of the molten slag in waste can be measured with the weighing machine attached to the mobile trolley which installs the waste pan 2, the mass of molten slag may be estimated from operation conditions and results. . However, the mass of the crushed slag introduced from the chute is subtracted and calculated.
  • the crushed slag it is preferable to wet the crushed slag with water in advance, and it is more preferable to keep it hydrated. This is because the water and the crushed slag can be more reliably involved in the forming slag.
  • water and crushed slag may be supplied together from the pipe 4. In the example shown in FIG. 1, an example is shown in which water and crushed slag are put together from a pipe 4. In this case, the diameter of the pipe 4 only needs to be large enough to prevent crushing slag from being blocked in the pipe.
  • the molten slag discharged from the converter 1 to the waste pan 2 has, for example, a CaO / SiO 2 mass ratio (basicity) of 0.8 to 2.0 and an FeO concentration of 10 to 40 mass%. .
  • the molten slag is struck against the bottom of the sewage pan 2, so that the molten slag is vigorously stirred and the fine CO bubbles inside the molten slag are combined and floated.
  • emitted molten slag is rapidly cooled by contacting with the bottom of the discharge pan 2, the solid-phase rate of molten slag rises.
  • the solid phase rate of the bottom side of the waste pan 2 and the surface layer of the molten slag is increased, forming is temporarily suppressed, but the molten slag in the waste pan 2 is discharged from the converter 1 one after another. When it comes into contact with the molten slag and melts again, it begins to form.
  • the crushed slag that is introduced together with water destroys the solidified surface layer of the molten slag in the slag pan 2, water enters the molten slag in the slag pan 2 and is cooled to further form. Can be suppressed.
  • a slag pool is generated in the slag pan 2, and molten slag is discharged from the converter 1 to the slag pool one after another. Then, water and crushed slag are continuously introduced to the vicinity of the position where the molten slag discharged from the converter 1 reaches the inside of the slagging pan 2, and the water and crushed slag are entrained in the molten slag, which is the same as the initial stage of sewage Such an effect is exhibited.
  • the range that can enter the molten slag is limited, and the forming suppression effect is also limited.
  • the crushed slag is not added, when the water is vaporized, the surrounding molten slag is rapidly cooled to form a solidified shell, and most of the water vapor generated by the vaporization is blown upward. This narrows the cooling range of the molten slag.
  • the crushed slag when crushed slag is added together with water, the crushed slag physically breaks the solidified shell of the slag generated by the vaporization of water, so water enters the molten slag from the portion where the solidified shell is broken into the molten slag.
  • the molten slag can be cooled in a wider range to increase the solid phase ratio, and forming can be efficiently suppressed.
  • the speed of discharging the molten slag to a discharge slag pot having an internal volume of 30 m 3 ⁇ 70m 3 shall be more than 3 tons per minute from the viewpoint of not extending the operating time of the converter.
  • it is 4 tons or more.
  • it does not specifically limit about an upper limit, Since the momentum of the molten slag which falls will increase and it will become easy to jump out of a waste pan, it is preferable to set it as 6 tons or less per minute. More preferably, it is 5 tons or less.
  • crushed slag having a particle size of less than 5.0 mm, the solidified shell of molten slag generated by rapid cooling by vaporization of water cannot be destroyed.
  • the crushed slag to be added may contain crushed slag having a particle size of less than 5.0 mm and greater than 30 mm, and at least 50.0 kg to 200 kg of crushed slag having a particle size of 5.0 mm to 30 mm is charged per minute. do it. More preferably, the particle size of the crushed slag is 8.0 mm to 20 mm, more preferably 10 mm to 15 mm. The input amount of crushed slag will be described later.
  • the amount of water is preferably 70 kg to 150 kg per minute, more preferably 100 kg to 120 kg.
  • the crushed slag is 70 kg to 150 kg per minute, more preferably 100 kg to 120 kg.
  • any of converter slag, desiliconization slag, hot metal dephosphorization slag, ladle slag (ingot slag) may be sufficient. This is because the above-described strength and specific gravity are required to break down the slag solidified shell generated when water is vaporized.
  • the representative composition of the slag is shown in Table 1.
  • Converter slag is slag discharged from the furnace after decarburization and blowing in the converter, and the basicity is generally about 3 to 5.
  • the desiliconized slag is slag having a high SiO 2 concentration that is produced when iron oxide or oxygen gas is added to the hot metal to oxidize [Si] in the hot metal.
  • the hot metal dephosphorization slag is a slag in which CaO, iron oxide and oxygen gas are added to oxidize [P] in the hot metal to (P 2 O 5 ) and take it in.
  • the ladle slag is a slag having a high concentration of Al 2 O 3 remaining in the ladle after discharging the molten steel to the continuous casting machine.
  • the present invention will be further described based on examples, but the conditions in the examples are one example of conditions adopted for confirming the feasibility and effects of the present invention. It is not limited to the example conditions.
  • the present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
  • Example 1 After the hot metal dephosphorization process by the multi-functional converter method, the converter is tilted while the hot metal remains in the converter, and the furnace furnace port is placed at the discharge pan with a volume of 50 m 3 installed below the furnace body. From about 14 tons of molten slag having a basicity of about 1 was discharged over about 3 minutes. In addition, when discharging molten slag, from immediately after the start of sewage to the end of sewage, 100 kg of water per minute is introduced from the pipe, and at the same time, converter slag having a composition shown in Table 1 of 200 kg per minute (particle size 5 (0.0 mm to 30 mm) was introduced from the chute.
  • the slag discharge time is not extended and the forming can be efficiently suppressed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Selon l'invention, après le traitement d'une fonte grise liquide dans un four convertisseur, du laitier en fusion est déchargé du four convertisseur vers un bac à laitier déchargé, à une vitesse d'au moins 3 tonnes par minute. À partir de l'initiation dudit déchargement et au moins jusqu'au moment où le déchargement de laitier est achevé, 50,0 à 200 kg par minute d'eau et 50,0 à 200 kg par minute de sable de laitier ayant une grosseur de grain de 5,0 à 30 mm sont chargés en continu depuis le dessus du bac à laitier déchargé jusqu'à une position proche du site où le laitier en fusion déchargé à partir du four convertisseur arrive à l'intérieur du bac à laitier déchargé.
PCT/JP2017/004613 2017-02-08 2017-02-08 Procédé de régulation moussage de laitier Ceased WO2018146754A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201780082285.XA CN110139938A (zh) 2017-02-08 2017-02-08 抑制炉渣起泡的方法
KR1020197018163A KR20190089018A (ko) 2017-02-08 2017-02-08 슬래그의 포밍 억제 방법
PCT/JP2017/004613 WO2018146754A1 (fr) 2017-02-08 2017-02-08 Procédé de régulation moussage de laitier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/004613 WO2018146754A1 (fr) 2017-02-08 2017-02-08 Procédé de régulation moussage de laitier

Publications (1)

Publication Number Publication Date
WO2018146754A1 true WO2018146754A1 (fr) 2018-08-16

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PCT/JP2017/004613 Ceased WO2018146754A1 (fr) 2017-02-08 2017-02-08 Procédé de régulation moussage de laitier

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KR (1) KR20190089018A (fr)
CN (1) CN110139938A (fr)
WO (1) WO2018146754A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08325619A (ja) * 1995-05-29 1996-12-10 Nippon Steel Corp 製鋼スラグのフォーミング抑制方法
JP2016148061A (ja) * 2015-02-10 2016-08-18 Ｊｆｅスチール株式会社 溶融スラグのフォーミング鎮静方法及びスラグ製品の製造方法
JP2017031446A (ja) * 2015-07-29 2017-02-09 新日鐵住金株式会社 スラグのフォーミング抑制方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920004938B1 (ko) * 1989-12-28 1992-06-22 포항종합제철 주식회사 슬래그 포밍 진정제
JP2596470B2 (ja) 1990-11-14 1997-04-02 新日本製鐵株式会社 スロッピング抑制方法
JP2582692B2 (ja) 1991-11-16 1997-02-19 新日本製鐵株式会社 転炉製鋼法
JP4580435B2 (ja) * 2008-05-27 2010-11-10 新日本製鐵株式会社 排滓鍋スラグのフォーミング鎮静材及びその鎮静方法
CN103540706B (zh) * 2012-07-11 2015-11-18 攀钢集团研究院有限公司 一种抑制炉渣泡沫化的方法
CN104878161A (zh) * 2014-02-28 2015-09-02 上海梅山钢铁股份有限公司 一种转炉渣罐用压渣剂及其制备方法
CN104561428B (zh) * 2014-12-11 2019-03-15 北京璞域环保科技有限公司 一种喷吹脱硫渣渣铁脱硫回收方法
CN105132605A (zh) * 2015-09-02 2015-12-09 新疆八一钢铁股份有限公司 高炉瓦斯灰用于转炉渣罐进行压渣消泡的工艺

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08325619A (ja) * 1995-05-29 1996-12-10 Nippon Steel Corp 製鋼スラグのフォーミング抑制方法
JP2016148061A (ja) * 2015-02-10 2016-08-18 Ｊｆｅスチール株式会社 溶融スラグのフォーミング鎮静方法及びスラグ製品の製造方法
JP2017031446A (ja) * 2015-07-29 2017-02-09 新日鐵住金株式会社 スラグのフォーミング抑制方法

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CN110139938A (zh) 2019-08-16
KR20190089018A (ko) 2019-07-29

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