WO2017122536A1 - Procédé de soufflage de convertisseur - Google Patents

Procédé de soufflage de convertisseur Download PDF

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Publication number
WO2017122536A1
WO2017122536A1 PCT/JP2016/088880 JP2016088880W WO2017122536A1 WO 2017122536 A1 WO2017122536 A1 WO 2017122536A1 JP 2016088880 W JP2016088880 W JP 2016088880W WO 2017122536 A1 WO2017122536 A1 WO 2017122536A1
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WO
WIPO (PCT)
Prior art keywords
concentration
mass
cao
mixed powder
blowing
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/JP2016/088880
Other languages
English (en)
Japanese (ja)
Inventor
政樹 宮田
秀平 笠原
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 CN201680044276.7A priority Critical patent/CN107849624B/zh
Priority to KR1020187001548A priority patent/KR102112530B1/ko
Priority to JP2017561577A priority patent/JP6460265B2/ja
Publication of WO2017122536A1 publication Critical patent/WO2017122536A1/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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C5/34—Blowing through the bath
    • 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
    • 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
    • C21C5/36—Processes yielding slags of special composition

Definitions

  • the present invention is a top-bottom converter, which removes phosphorus with a low Si concentration with a small amount of slag and performs a series of blowing from the hot metal without discharging the slag produced by the dephosphorization.
  • the present invention relates to a converter blowing method for melting steel.
  • Patent Document 1 discloses a method of using two converters, dephosphorizing the hot metal in one converter, and then decarburizing and blowing in the other converter. Yes.
  • Patent Document 2 As a method for performing hot metal dephosphorization with a small amount of quicklime without using fluorite, a method of spraying a mixed powder of CaO powder, Al 2 O 3 powder, and Fe 2 O 3 powder together with oxygen gas onto hot metal is disclosed in Patent Document 2. Is disclosed. In this method, CaO powder, which is a main dephosphorizing agent, is sprayed onto a hot spot having a high temperature of 2000 ° C. or higher where the top blown oxygen and hot metal come into contact, and CaO having a high melting point is hatched relatively quickly. At this time, the hatching of CaO is further accelerated by mixing CaO and Al 2 O 3 that generates a low melting point compound.
  • CaO powder which is a main dephosphorizing agent
  • the slag produced by this method focuses only on the viewpoint of improving the dephosphorization efficiency at the hot metal stage, and as a series of blowing from the hot metal without discharging the slag produced by the dephosphorization, the decarburization blown It is unclear whether molten steel with a high C concentration and a low P concentration can be produced even if smelting is continued.
  • Patent Document 3 discloses a method of producing molten steel having a low C concentration and a C concentration of 0.20 to 0.25% by mass by blowing up and blowing CaO powder together with top blowing oxygen gas in a converter. Is disclosed. However, in this method, since iron oxide is not blown up together with oxygen gas, the FeO concentration of the CaO—FeO-based melt in the slag generated at the fire point is low and the temperature of the fire point is high. Dephosphorization utilization efficiency as high as the method described in 1) cannot be obtained. Moreover, it is unclear whether the P concentration can be sufficiently reduced even when the C concentration is difficult to dephosphorize is 0.3 mass% or more.
  • Patent Document 4 discloses a method for smelting high carbon molten steel in which lime powder is blown and sprayed for 70% or more of the blowing time.
  • this method it is necessary to reduce the P concentration of the hot metal to 0.05% by mass or less in advance by a dephosphorization process that is separately performed, and the dephosphorization process and the decarburization process cannot be performed in a series of blowing processes. .
  • the present invention has been made in view of the above-described problems, and an object thereof is to provide a converter blowing method for producing molten steel having a high C concentration and a low P concentration without interrupting blowing from the hot metal stage with a small amount of slag.
  • the gist of the present invention is as follows. (1) A hot metal having a Si concentration of 0.15% by mass or less and a P concentration of 0.09% by mass or more is charged into the top-bottom blowing converter, and is a mixed powder of CaO powder and Fe 2 O 3 powder. A mixed powder in which the mass ratio of CaO and Fe 2 O 3 is 9: 1 to 6: 4 and the total of CaO, CaCO 3 , FeO, and Fe 2 O 3 is 95% by mass or more.
  • molten steel having a high C concentration and a low P concentration can be produced with high efficiency without interrupting blowing from hot metal having a P concentration of 0.09 mass% or more with a small amount of slag.
  • the molten steel having a high C concentration refers to a molten steel having a C concentration of 0.3 to 1.0% by mass
  • the molten steel having a low P concentration refers to a molten steel having a P concentration of 0.02% by mass or less.
  • molten iron having a Si concentration of 0.15% by mass or less (P concentration of 0.09% by mass or more) is charged into an upper bottom blowing converter, and CaO powder and Fe 2 are added.
  • the CaO powder is mainly powdered lime, limestone or the like, and is mainly CaO or CaCO 3 .
  • Fe 2 O 3 powder is mainly powdered iron ore and mainly composed of Fe 2 O 3 , but may contain FeO or crystal water.
  • the CaO content is calculated by (CaO mass + CaCO 3 mass ⁇ 0.56).
  • Fe 2 O 3 minutes is regarded as Fe 2 O 3 minutes including FeO.
  • a mixed powder of CaO powder and Fe 2 O 3 powder is blown up onto the hot metal bath surface together with O 2 gas, and high basicity slag is generated at a fire point of 2000 ° C. or higher.
  • a slag having a high basicity and a high FeO concentration is formed in the hot spot region, and reacts with P in the molten iron, so that a very high dephosphorization efficiency can be realized.
  • the maximum particle size of the mixed powder is preferably set to 0.15 mm or less in consideration of the conveyance with O 2 gas and the ease of slag formation at the fire point.
  • the activity of P in molten iron increases as the C concentration in molten iron increases. That is, the higher the C concentration in the molten iron, the easier the dephosphorization reaction proceeds. Therefore, when the relationship between the C concentration in the molten iron and the dephosphorization rate at the time of completion of blowing the mixed powder of CaO powder and Fe 2 O 3 powder was investigated, the C concentration in the molten iron was 2.5% by mass or more. the mixed powder of CaO powder and Fe 2 O 3 powder were blown upward together with O 2 gas while there, then, when the O 2 gas alone was blown on to the decarburization blowing, readily low high P concentration C concentration It has been found that molten steel can be produced.
  • FeO in the slag is reduced by C in the molten iron, and as the FeO concentration in the slag decreases, a high melting point 2CaO.SiO 2 -3CaO.P 2 O 5 solid solution or 3CaO is contained in the molten slag.
  • ⁇ P 2 O 5 solid phase crystallizes out.
  • the remaining FeO in the liquid phase is further reduced, the melting point of the liquid phase slag rises, and the liquid phase slag solidifies.
  • the mixed powder of CaO powder and Fe 2 O 3 powder is blown up to increase the dephosphorization rate, and then only O 2 gas is blown up.
  • the temperature of the molten iron and slag continues to rise.
  • high partial concentration of FeO is melted, is reduced by C in the molten iron.
  • an object of the present invention is to provide a converter blowing method for producing molten steel having a high C concentration and a low P concentration without interrupting blowing from the hot metal stage with a small amount of slag.
  • C concentration and P concentration at the end of blowing are unified to C: 0.85 to 0.99 mass%, P ⁇ 0.020 mass% (molten steel temperature is 1670 ⁇ 5 ° C.), and CaO powder
  • the mixture concentration of CaO powder and Fe 2 O 3 powder is blown up oxygen, with the C concentration in the molten iron at the time of ending the mixed powder of Fe 2 O 3 powder being in the range of 2.5 to 3.6% by mass
  • the steel was blown up while the C concentration in the molten iron together with the gas satisfied a predetermined concentration condition, and then only the O 2 gas was continuously blown up to produce molten steel.
  • the Si concentration in the hot metal 0.05% by mass
  • the mass ratio of CaO content and Fe 2 O 3 content in the mixed powder of CaO powder and Fe 2 O 3 powder is 4: 1, mixing
  • the CaO content in the powder was unified at a rate of 10 to 15 kg / molten ton, 1.5 to 3.0 kg / min / molten ton, and an O 2 gas flow rate of 2.0 to 2.5 Nm 3 / min / molten ton.
  • the C concentration in the molten iron at the time when the mixed powder is blown up is the relationship between the supply amount of the oxygen source (oxygen gas, iron oxide, etc.) and the amount of oxygen necessary for oxidizing the hot metal components (carbon, silicon) ( However, the oxygen utilization efficiency expected from operational experience is taken into account).
  • Table 1 shows the blowing conditions and results.
  • the ratio of the top-blown mixed powder shown in Table 1 indicates the ratio when impurities are removed, and in the mixed powder, the total of CaO content + Fe 2 O 3 minutes + Al 2 O 3 is 95% by mass or more. Shall.
  • the top blowing speed of the CaO content in the mixed powder was set to 2.5 kg / min / molten ton, and decarburization blowing was performed at the same oxygen flow rate even after finishing the top blowing of the mixed powder.
  • the Si concentration in the molten iron was 0.15% or less and the P concentration in the molten steel after the treatment could be set to a target value of 0.020% by mass or less.
  • the top blowing speed of the CaO content in the mixed powder was 1.5 to 2.5 kg / min / molten ton, and decarburization blowing was performed at the same oxygen flow rate even after the top spraying of the mixed powder was completed.
  • the flow rate of the top blown O 2 gas is 1.5 to 3.0 Nm 3 / min / molten ton, and the P concentration in the molten steel after treatment can be reduced to the target value of 0.020% by mass or less. I was able to confirm.
  • the upper limit of the flow rate of O 2 gas is set to 3.0 Nm 3 / min / molten metal ton.
  • the temperature of the CaO—FeO melt in the slag also becomes higher than when the Fe 2 O 3 powder is mixed and blown up.
  • the dephosphorization reaction does not proceed easily, and the dephosphorization rate has become low even when the same CaO basic unit is blown up.
  • the Fe 2 O 3 concentration in the mixed powder is as low as 5% by mass as in Comparative Example 3, it is considered that the P concentration in the molten steel after the treatment did not reach the target value.
  • the CaO amount in the mixed powder is 10 to 15 kg / molten ton.
  • the top blowing speed of the CaO content in the mixed powder is 1.5 to 3.0 kg / min / molten ton
  • the P concentration in the molten steel after the treatment is set to a target value of 0.020% by mass or less. We were able to.
  • the melting point of the CaO—FeO melt increased, the fluidity decreased, and the dephosphorization reaction rate decreased.
  • the top blowing rate of the CaO content in the mixed powder is 1.5 to 3.0 kg / min / molten ton.
  • Step 2 Next, based on what was confirmed in Step 1 above, hot metal having a Si concentration of 0.15 mass% or less and a P concentration of 0.09 mass% or more was charged into the top-bottom blown converter, and CaO A mixed powder of powder and Fe 2 O 3 powder and having a mass ratio of CaO and Fe 2 O 3 minutes of 9: 1 to 6: 4 is obtained at a flow rate of 1.5 to 3.0 Nm 3 / min.
  • the C concentration in the molten steel at the point of time when the top blowing of the mixed powder is finished is 3.0 mass% or 3 Standardized to 1% by mass.
  • the hot metal having a Si concentration lowered to 0.05% by mass by desiliconization treatment was charged into an upper bottom blowing converter, and Fe 2 O 3 was added to 96% by mass.
  • the iron ore containing 6.3 kg / molten iron ton was added on top.
  • the P concentration at the time after the end of the mixed powder top blowing is considered to be lower than the P concentration when the C concentration is 1.0% by mass.
  • the experiment is based on the premise that a molten steel having a C concentration of 0.3 to 1.0% by mass is produced as a high C concentration, but this is particularly effective for molten steel having a C concentration of 0.8 to 1.0% by mass or more. Is more preferable because it becomes more prominent.
  • the conditions in the examples are one example of conditions used for confirming the feasibility and effects of the present invention, and the present invention is based on this one example of conditions. It is not limited.
  • 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 2 The hot metal in which the Si concentration in the hot metal was reduced to 0.05% by mass by desiliconization was charged into the top-bottom blowing converter, and the iron ore containing 96% by mass of Fe 2 O 3 was increased to 6.3 kg / molten ton. Added.
  • the flow rate of 2.5 Nm 3 / min / hot metal minute CaO with O 2 gas ton Fe 2 O 3 minutes and 4 in the weight ratio: 1 and the mixed powder (CaO in the powder mixture is 15 kg / hot metal ton) was blown off at the same oxygen flow rate even after finishing the top blowing of the mixed powder.
  • the C concentration in the molten iron at the end of the top blowing of the mixed powder was 3.1% by mass.
  • CO 2 gas was continuously blown from the tuyere installed at the bottom of the furnace at 0.1 Nm 3 / min / molten metal ton.
  • the molten steel after the treatment was 1670 ° C., and in the molten steel, the C concentration was 0.98 mass%, the P concentration was 0.015 mass%, and the target P concentration was 0.020 mass% or less.
  • the C concentration in the molten iron at the end of the top blowing of the mixed powder was 2.2% by mass.
  • CO 2 gas was continuously blown from the tuyere installed at the bottom of the furnace at 0.1 Nm 3 / min / molten metal ton.
  • the P concentration in the molten steel after the treatment was 0.023 mass%, and the target P concentration of 0.020 mass% or less could not be achieved.
  • a high C concentration and a low P concentration molten steel can be produced with high efficiency without interrupting blowing from hot metal having a P concentration of 0.09 mass% or more with a small amount of slag. Industrial value is great.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

Selon la présente invention, de l'acier fondu avec une concentration en C d'au moins 0,3 % en masse est produit par les étapes consistant : à charger de la fonte brute en fusion avec une concentration en Si inférieure ou égale à 0,15 % en masse et une concentration en P d'au moins 0,09 % en masse dans un convertisseur à soufflage par le fond ; insuffler par le haut une poudre mixte, qui contient de la poudre de CaO et de la poudre de Fe2O3 suivant un rapport massique des composants CaO aux composants Fe2O3 de 9/1 à 6/4 et qui comporte au moins 95 % en masse de CaO, CaCO3, FeO et Fe2O3, avec du gaz oxygène ayant un débit de 1,5 à 3,0 Nm3/min/tonne de fonte brute en fusion ; régler, pendant le soufflage par le haut, la quantité de composants CaO dans la poudre mixte insufflée par le haut à une valeur de 10 à 15 kg/tonne de fonte brute en fusion et le débit d'alimentation en composants CaO à une valeur de 1,5 et 3,0 kg/min/tonne de fonte brute en fusion ; achever le soufflage par le haut de la poudre mixte lorsque la concentration en C dans la fonte brute en fusion atteint au moins 2,5 % en masse ; et continuer, après la fin du soufflage par le haut de la poudre mixte, le soufflage par le haut du gaz oxygène.
PCT/JP2016/088880 2016-01-15 2016-12-27 Procédé de soufflage de convertisseur Ceased WO2017122536A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201680044276.7A CN107849624B (zh) 2016-01-15 2016-12-27 转炉吹炼方法
KR1020187001548A KR102112530B1 (ko) 2016-01-15 2016-12-27 전로 취련 방법
JP2017561577A JP6460265B2 (ja) 2016-01-15 2016-12-27 転炉吹錬方法

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Application Number Priority Date Filing Date Title
JP2016006136 2016-01-15
JP2016-006136 2016-01-15

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WO2017122536A1 true WO2017122536A1 (fr) 2017-07-20

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KR (1) KR102112530B1 (fr)
CN (1) CN107849624B (fr)
WO (1) WO2017122536A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022026942A (ja) * 2020-07-31 2022-02-10 株式会社神戸製鋼所 転炉吹錬方法

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Publication number Priority date Publication date Assignee Title
JP2006009146A (ja) * 2004-05-24 2006-01-12 Sumitomo Metal Ind Ltd 溶銑の精錬方法
JP2007224388A (ja) * 2006-02-24 2007-09-06 Sumitomo Metal Ind Ltd 溶銑の処理方法

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JP2007224388A (ja) * 2006-02-24 2007-09-06 Sumitomo Metal Ind Ltd 溶銑の処理方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022026942A (ja) * 2020-07-31 2022-02-10 株式会社神戸製鋼所 転炉吹錬方法
JP7451341B2 (ja) 2020-07-31 2024-03-18 株式会社神戸製鋼所 転炉吹錬方法

Also Published As

Publication number Publication date
CN107849624A (zh) 2018-03-27
CN107849624B (zh) 2019-07-23
KR102112530B1 (ko) 2020-05-20
JPWO2017122536A1 (ja) 2018-04-05
KR20180017200A (ko) 2018-02-20
JP6460265B2 (ja) 2019-01-30

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