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WO2009003364A1 - Procédé de fabrication d'acier dans un convertisseur à lances supérieure, inférieures et latérale - Google Patents

Procédé de fabrication d'acier dans un convertisseur à lances supérieure, inférieures et latérale Download PDF

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Publication number
WO2009003364A1
WO2009003364A1 PCT/CN2008/001237 CN2008001237W WO2009003364A1 WO 2009003364 A1 WO2009003364 A1 WO 2009003364A1 CN 2008001237 W CN2008001237 W CN 2008001237W WO 2009003364 A1 WO2009003364 A1 WO 2009003364A1
Authority
WO
WIPO (PCT)
Prior art keywords
converter
gun
blow
gas
slag
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/CN2008/001237
Other languages
English (en)
Chinese (zh)
Inventor
Liangcai Zhong
Yingxiong Zhu
Junwei Chen
Zhaoyi Lai
Boyu Chen
Biaocai Huang
Canrong Wang
Jianxiang Ke
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.)
Northeastern University China
Fujian Sangang Minguang Co Ltd
Original Assignee
Northeastern University China
Fujian Sangang Minguang Co Ltd
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 Northeastern University China, Fujian Sangang Minguang Co Ltd filed Critical Northeastern University China
Publication of WO2009003364A1 publication Critical patent/WO2009003364A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • C21C5/35—Blowing from above and through the bath

Definitions

  • the invention relates to a converter steelmaking method, in particular to a top-bottom side converter furnace steelmaking method, which is an improvement of the existing converter steelmaking method, and belongs to the technical field of steel metallurgy.
  • top-bottom double-blown converter is carried out by top-bottom double-blown converter.
  • the common method of top-bottom double-blow converter steelmaking is to blow oxygen from the upper part of the converter pool through the oxygen lance to the molten iron of the molten pool, from the bottom through the bottom gun. Nitrogen or argon is blown into the molten pool to stir the molten pool to improve the stirring ability of the molten pool.
  • the double-blown converter the conventional one-step steelmaking process is adopted, and the dephosphorization effect cannot meet the requirements of low-phosphorus steel and ultra-low-phosphorus steel. To this end, there have been two-step steelmaking in the same furnace and two-step steelmaking in the same furnace.
  • the double-furnace method for different furnaces uses two converters, one for desiliconization and dephosphorization of molten iron, and the deionized molten iron is exchanged into another converter for decarburization.
  • the two-step steelmaking process is carried out in the same converter.
  • the dephosphorization slag is poured out and then decarburized.
  • Both methods are dephosphorization at lower temperatures to enhance dephosphorization. However, at a lower temperature, it is more difficult to form a certain alkalinity slag by supplying oxygen to the top lance. The slag stratification occurs, the upper slag is better, and the lower part is close to the slag-gold interface. The slag is not well formed, which affects the dephosphorization effect.
  • the top-bottom double-blown converter mainly relies on the gas blown by the top gun and the bottom gun to drive the liquid in the molten pool to form an up-and-down circulation flow to stir the molten pool, and a stirring sub-zone is formed above the bottom gun in the molten pool. If the bottom gun is not well arranged, the stirring sub-zones are independent of each other and cannot form a horizontal flow throughout the molten pool, which is not conducive to the mixing of the entire molten pool; even with an asymmetric bottom gun arrangement, it is difficult to make the molten pool Significant horizontal flow. Therefore, when the top and bottom double-blown converter pools are mixed After reducing to a certain level, it is difficult to further reduce it.
  • the stirring effect of the bottom gun is lowered due to the rising of the bottom of the furnace, the stirring effect of the converter molten pool is deteriorated, and the mixing time becomes long, which is not conducive to the reaction between the slag gold and the smelting of the ultra-low carbon steel. It is not conducive to reducing the oxidization of slag and molten steel at the smelting end point.
  • the object of the present invention is to solve the above problems existing in the prior art, improve the stirring effect of the molten pool of the double-blown converter, further reduce the mixing time of the converter pool, improve the kinetic conditions of the slag gold reaction, and invent a top and bottom.
  • the side-blown converter steelmaking method is given, and a new type of top-bottom side blowing converter is given.
  • the top and bottom side blowing converter can strengthen the slagging, improve the dephosphorization effect at a lower temperature, reduce the oxidization of the slag and the molten steel at the end of the blowing, and further decarburize the bottom and bottom blowing converter. Dephosphorization operation, or using a top-bottom side converter to carry out conventional one-step steelmaking to improve the dephosphorization effect and metallurgical effect.
  • the top-bottom side converter furnace steelmaking method comprises a top-bottom double-blown converter provided with a top gun and a bottom gun, wherein a top gun is used to blow oxygen, and a bottom gun is used to blow the stirring gas.
  • the method is characterized in that: at least one side blowing gun is disposed at the height of the entire molten pool of the converter furnace wall of the top-bottom double-blown converter, and a side blowing gun is used to blow the gas or a carrier gas is used to blow the slag powder.
  • the side blowing gun is disposed near the slag gold interface of the furnace wall or the side wall of the side wall of the converter trunnion or inside the metal melting pool, and is driven by a side blowing gun.
  • a gas is blown into the molten metal pool or a slag powder is blown with a carrier gas.
  • the gas blown into the slag gold interface or into the molten metal pool by the side blowing gun is an oxidizing gas (such as oxygen, carbon dioxide, etc.) or a stirring gas (such as nitrogen).
  • an oxidizing gas such as oxygen, carbon dioxide, etc.
  • a stirring gas such as nitrogen.
  • Gas, argon, etc. to strengthen slag formation, improve dephosphorization effect and improve the metallurgical effect of the converter.
  • the entire furnace pool height of the converter furnace wall is circumferentially mounted with 1-10 side blow guns.
  • the angle between the center line of the side blow gun and the horizontal line is in the range of ⁇ 20°.
  • the side blow gun and the wall mounting point of the furnace wall are 10 . Installed in an angle range up to 170°.
  • the side blowing guns are arranged in a single layer or in a plurality of layers in the vertical direction of the furnace wall, and may be arranged symmetrically or asymmetrically.
  • the side blowing gun adopts a double-layered casing structure when the oxidizing gas is blown or the oxidizing gas is used as a carrier gas to blow the slag forming powder, wherein the inner tube is oxidized.
  • the gas or the oxidizing gas is used as the carrier gas to blow into the slag forming powder, the ring between the inner tube and the outer tube is passed through the cooling medium, and the double-wall structure is arranged on the wall of the annular slit, so that the cooling medium is wrapped in a rotating manner.
  • the oxidizing gas blows out the side blowing gun.
  • the side blowing gun adopts a single-layer pipe structure or a double-layer casing when blowing non-oxidizing gas # or blowing a slag-forming powder with a non-oxidizing gas as a carrier gas. Structure or ring-shaped structure.
  • the beneficial effects of the invention are: improving the existing converter steelmaking method, and giving a novel top-bottom side blowing converter, improving the 'stirring effect of the double-blown converter pool, further reducing The mixing time of the converter molten pool improves the kinetic conditions of the slag gold reaction, strengthens the slag formation, improves the dephosphorization effect at lower temperatures, and reduces the oxidation of the slag and molten steel at the end of the blowing.
  • Figure 1 is a schematic longitudinal sectional view of a top and bottom side blowing converter
  • Figure 2 is a cross-sectional view of the A-A of Figure 1, showing a scheme in which the four side blow guns are arranged on both sides of the center line 6 of the top and bottom side blow converter trunnions;
  • Figure 3 is a cross-sectional view of the A-A of Figure 1, showing a scheme in which the two side blowing guns are arranged on the side line 6 - side of the top and bottom side blow converter trunnion;
  • Figure 4 is a cross-sectional view of the A-A of Figure 1, showing a scheme in which the two side blowing guns are arranged on both sides of the center line 6 of the top and bottom side blowing converter trunnions;
  • Figure 5 is a schematic view of the side blowing gun arranged below the slag-gold interface of the side wall of the top-bottom side blowing converter;
  • Figure 6 is a side-blown gun placed on the top and bottom side of the blowing furnace side of the furnace wall under the slag interface Schematic diagram.
  • the invention comprises a top-bottom double-blown converter provided with a top gun 1 and a bottom gun 2, wherein the top gun 1 is used to blow oxygen gas, the bottom gun 2 is blown with nitrogen or argon gas to agitate the molten pool, and the top and bottom double-blown converter is rotated.
  • the entire molten pool height of the furnace wall is mounted with a side blowing gun 5 blown into an oxidizing gas or a stirring gas, or a carrier gas is blown into the slag forming powder.
  • 1-10 side blow guns 5 are installed near the interface between the slag 3 and the metal melt 4 on both sides of the center line 6 of the converter trunnion, preferably 1-6 Branch, side blowing
  • the gun 5 can be placed horizontally or in a range of -10° to +10° with the horizontal line, preferably 0° to 5°, and 10° to 170° to the tangent plane of the furnace wall mounting point. Angle range installation, preferably 40 ° ⁇ 90 °.
  • the side blowing guns 5 can be arranged in 1-5 layers in the vertical direction, preferably in 1-3 layers.
  • the side blow guns 5 can be arranged over the entire height of the converter bath, preferably in a range from 100 mm from the bottom of the new furnace to the slag gold interface.
  • the side blowing guns 5 may be arranged symmetrically or asymmetrically.
  • the side blowing gun 5 may be blown with an oxidizing gas or a non-oxidizing gas, or may be sprayed with a carrier gas into the slag powder.
  • the side blowing gun 5 which is blown into the oxidizing gas or sprayed with the oxidizing gas as the carrier gas into the slag forming powder should be a double-layered sleeve, and the inner tube is made of an oxidizing gas or an oxidizing gas and a slag powder, and the outer layer tube is The inner layer of the inner tube is passed through a cooling medium; when a non-oxidizing gas is blown or a non-oxidizing gas is used as a carrier gas to spray the slag powder, a single-tube side blowing gun is used, or a circumferential seam side blowing gun, or a double layer is used.
  • the casing side blows the gun.
  • the side blow gun 5 immersed in the molten steel should be supplied with argon gas.
  • the diameter of the side blow gun 5 is determined by the capacity of the converter and the strength of the side blow supply.
  • Table 1 compares the average carbon and oxygen concentration products of the different side blowing modes of the top and bottom side blowing converters and the top and bottom double blowing converter blowing ends.
  • Table 2 compares the average side ton of the top and bottom side blow converters with the average ton of steel and lime consumption of the top and bottom combined blown converters.

Landscapes

  • 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)

Abstract

La présente invention concerne un procédé de fabrication d'acier dans un convertisseur à lances supérieure, inférieure et latérale comprenant l'utilisation d'un convertisseur équipé d'une lance supérieure (1) et de lances inférieures (2), dans lesquelles de l'oxygène est soufflé de la lance supérieure (1), et un gaz d'agitation est soufflé des lances inférieures (2). Le procédé se caractérise en ce que le convertisseur comporte au moins une lance latérale (5) disposée sur la paroi latérale du convertisseur lors de la montée du bain en fusion dans le convertisseur, et le gaz ou laitier formé avec le gaz vecteur est soufflé depuis la lance latérale (5). Le procédé peut améliorer l'effet d'agitation dans la solution en fusion dans le convertisseur, réduire la durée de mélange du bain en fusion dans le convertisseur, améliorer les conditions dynamiques de réaction entre le laitier et le métal, améliorer le décrassage, améliorer l'effet de déphosphoration à basse température, et réduire l'oxydabilité du laitier final et de l'acier en fusion.
PCT/CN2008/001237 2007-07-03 2008-06-26 Procédé de fabrication d'acier dans un convertisseur à lances supérieure, inférieures et latérale Ceased WO2009003364A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200710011950.4 2007-07-03
CN200710011950 2007-07-03
CN200810126344.1 2008-06-26
CNA2008101263441A CN101338349A (zh) 2007-07-03 2008-06-26 顶底侧吹转炉炼钢法

Publications (1)

Publication Number Publication Date
WO2009003364A1 true WO2009003364A1 (fr) 2009-01-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2008/001237 Ceased WO2009003364A1 (fr) 2007-07-03 2008-06-26 Procédé de fabrication d'acier dans un convertisseur à lances supérieure, inférieures et latérale

Country Status (2)

Country Link
CN (1) CN101338349A (fr)
WO (1) WO2009003364A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102778131A (zh) * 2012-08-03 2012-11-14 北京科技大学 一种转炉水模型实验模拟装置及模拟方法
CN109214137A (zh) * 2018-11-12 2019-01-15 西安建筑科技大学 一种针对转炉流场最低混匀时间的预测方法
CN109472090A (zh) * 2018-11-12 2019-03-15 西安建筑科技大学 一种针对钢包最低混匀时间的预测方法
CN115786628A (zh) * 2022-11-12 2023-03-14 甘肃酒钢集团宏兴钢铁股份有限公司 一种利用二氧化碳与氧气混合顶吹洗炉底的方法
CN116536474A (zh) * 2023-03-31 2023-08-04 马鞍山钢铁股份有限公司 一种转炉全炉役极低碳氧浓度积的控制方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102732669B (zh) * 2012-06-21 2014-11-12 莱芜钢铁集团有限公司 转炉除脱磷渣的辅助装置和吹气辅助除脱磷渣的方法
CN102796841B (zh) * 2012-08-21 2014-05-14 东北大学 一种在顶底复吹转炉中侧吹粉粒石灰石造渣炼钢的方法
CN114686641B (zh) * 2020-12-28 2024-02-09 河北龙凤山铸业有限公司 一种顶底侧多点吹氧提纯转炉和方法
CN113174491A (zh) * 2021-04-28 2021-07-27 东北大学 一种铜渣贫化-侧顶复合吹炼还原一体炉

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US3843354A (en) * 1971-02-11 1974-10-22 Metallurg Ct Voor Res In De Me Pneumatic refining of pig iron
JPS5732316A (en) * 1980-05-13 1982-02-22 Centre Rech Metallurgique Improvement in cast iron gas refinement by sending gas upwardly and downwardly into convertor
JPS58213817A (ja) * 1982-06-04 1983-12-12 Sumitomo Metal Ind Ltd 鋼の精錬方法
JPS59205410A (ja) * 1983-05-10 1984-11-21 Nippon Steel Corp 転炉操業方法
CN86203067U (zh) * 1986-06-23 1987-03-25 上海第五钢铁厂 一种新型复吹底枪
JPH01132707A (ja) * 1987-11-18 1989-05-25 Nkk Corp スラグと溶湯の撹拌方法
JPH06287622A (ja) * 1993-03-31 1994-10-11 Nkk Corp 転炉吹錬方法
CN1100145A (zh) * 1993-06-21 1995-03-15 奥地利钢铁联合企业阿尔帕工业设备制造公司 炼钢用转炉
JPH07252515A (ja) * 1994-03-16 1995-10-03 Nkk Corp 転炉製鋼方法
JPH09176719A (ja) * 1995-12-26 1997-07-08 Sumitomo Metal Ind Ltd 転炉および吹錬操業方法
CN1354262A (zh) * 2000-11-16 2002-06-19 承德钢铁集团有限公司 顶侧复吹转炉炼钢方法
EP1224336B1 (fr) * 1999-09-22 2003-10-22 Voest-Alpine Industrieanlagenbau Gmbh Procede et appareil pour injecter des gaz et des solides sous la surface d'un bain metallurgique

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3843354A (en) * 1971-02-11 1974-10-22 Metallurg Ct Voor Res In De Me Pneumatic refining of pig iron
JPS5732316A (en) * 1980-05-13 1982-02-22 Centre Rech Metallurgique Improvement in cast iron gas refinement by sending gas upwardly and downwardly into convertor
JPS58213817A (ja) * 1982-06-04 1983-12-12 Sumitomo Metal Ind Ltd 鋼の精錬方法
JPS59205410A (ja) * 1983-05-10 1984-11-21 Nippon Steel Corp 転炉操業方法
CN86203067U (zh) * 1986-06-23 1987-03-25 上海第五钢铁厂 一种新型复吹底枪
JPH01132707A (ja) * 1987-11-18 1989-05-25 Nkk Corp スラグと溶湯の撹拌方法
JPH06287622A (ja) * 1993-03-31 1994-10-11 Nkk Corp 転炉吹錬方法
CN1100145A (zh) * 1993-06-21 1995-03-15 奥地利钢铁联合企业阿尔帕工业设备制造公司 炼钢用转炉
JPH07252515A (ja) * 1994-03-16 1995-10-03 Nkk Corp 転炉製鋼方法
JPH09176719A (ja) * 1995-12-26 1997-07-08 Sumitomo Metal Ind Ltd 転炉および吹錬操業方法
EP1224336B1 (fr) * 1999-09-22 2003-10-22 Voest-Alpine Industrieanlagenbau Gmbh Procede et appareil pour injecter des gaz et des solides sous la surface d'un bain metallurgique
CN1354262A (zh) * 2000-11-16 2002-06-19 承德钢铁集团有限公司 顶侧复吹转炉炼钢方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102778131A (zh) * 2012-08-03 2012-11-14 北京科技大学 一种转炉水模型实验模拟装置及模拟方法
CN109214137A (zh) * 2018-11-12 2019-01-15 西安建筑科技大学 一种针对转炉流场最低混匀时间的预测方法
CN109472090A (zh) * 2018-11-12 2019-03-15 西安建筑科技大学 一种针对钢包最低混匀时间的预测方法
CN109214137B (zh) * 2018-11-12 2022-09-27 西安建筑科技大学 一种针对转炉流场最低混匀时间的预测方法
CN109472090B (zh) * 2018-11-12 2022-10-11 西安建筑科技大学 一种针对钢包最低混匀时间的预测方法
CN115786628A (zh) * 2022-11-12 2023-03-14 甘肃酒钢集团宏兴钢铁股份有限公司 一种利用二氧化碳与氧气混合顶吹洗炉底的方法
CN115786628B (zh) * 2022-11-12 2024-06-11 甘肃酒钢集团宏兴钢铁股份有限公司 一种利用二氧化碳与氧气混合顶吹洗炉底的方法
CN116536474A (zh) * 2023-03-31 2023-08-04 马鞍山钢铁股份有限公司 一种转炉全炉役极低碳氧浓度积的控制方法

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