WO2017188159A1 - 溶鉄の脱硫方法及び脱硫装置 - Google Patents

溶鉄の脱硫方法及び脱硫装置 Download PDF

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Publication number
WO2017188159A1
WO2017188159A1 PCT/JP2017/016091 JP2017016091W WO2017188159A1 WO 2017188159 A1 WO2017188159 A1 WO 2017188159A1 JP 2017016091 W JP2017016091 W JP 2017016091W WO 2017188159 A1 WO2017188159 A1 WO 2017188159A1
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WO
WIPO (PCT)
Prior art keywords
desulfurizing agent
desulfurization
molten iron
agent
desulfurizing
Prior art date
Application number
PCT/JP2017/016091
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English (en)
French (fr)
Japanese (ja)
Inventor
俊夫 井蓋
Original Assignee
新日鐵住金株式会社
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 新日鐵住金株式会社 filed Critical 新日鐵住金株式会社
Priority to JP2018514569A priority Critical patent/JP6521177B2/ja
Priority to KR1020187033618A priority patent/KR102300458B1/ko
Priority to CN201780025893.7A priority patent/CN109072320B/zh
Publication of WO2017188159A1 publication Critical patent/WO2017188159A1/ja

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    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent

Definitions

  • the present invention relates to a molten iron desulfurization method and a desulfurization apparatus.
  • Patent Document 1 discloses a method of performing desulfurization by adding a deoxidizer, a desulfurizer, and a slag modifier to molten steel in steel. In this method, a desulfurizing agent and molten steel are stirred and reacted using the stirring energy of the steel output at the time of converter steel output.
  • Patent Document 2 discloses a method for refining molten steel by spraying a heated powdery flux through a lance toward molten steel that is discharged from a converter to a ladle.
  • Patent Document 1 reacts a desulfurizing agent and molten steel only with the stirring energy of the steel output flow. For this reason, since the stirring power is insufficient and the desulfurizing agent cannot be used effectively, the desulfurization rate is low.
  • An object of the present invention is to provide a technique capable of desulfurizing molten iron at a high desulfurization rate when tapping from a refining furnace (for example, a converter) to a refining vessel (for example, a ladle).
  • a refining furnace for example, a converter
  • a refining vessel for example, a ladle
  • the present invention is a molten iron desulfurization method of adding a desulfurizing agent to a tapping stream flowing down while changing the flow position when discharging molten iron from a smelting furnace to a smelting vessel,
  • a spray nozzle that discharges a desulfurizing agent, a storage container that stores the desulfurizing agent, and a desulfurizing agent that is stored in the storage container are attached to a charging chute having a variable charging direction in order to charge the raw material into the refining vessel.
  • the present invention is a desulfurization apparatus for molten iron that adds a desulfurization agent to a tapping stream that flows down while varying the flow position when tapping molten iron from a smelting furnace to a smelting vessel,
  • a spray nozzle that discharges a desulfurizing agent, a storage container that stores the desulfurizing agent, and a desulfurizing agent that is stored in the storage container are attached to a charging chute having a variable charging direction in order to charge the raw material into the refining vessel.
  • a spraying facility having a desulfurization agent supply path for supplying to the spray nozzle;
  • the direction in which the desulfurizing agent is sprayed by the spray nozzle is variable along with the charging chute, and the spray nozzle is a molten iron desulfurization device that can spray the desulfurizing agent in accordance with the change in the downstream position of the tapping stream. .
  • the position where the desulfurization agent is sprayed on the tapping stream is preferably above the half height position between the tapping port of the smelting furnace and the molten iron surface in the smelting vessel.
  • the particle size of the desulfurizing agent is preferably 0.5 to 1.0 mm.
  • the desulfurization agent can be sprayed from the spray nozzle to the tapping stream during a period of 3/4 or more of the period from the start of pouring of the molten iron from the smelting furnace to the smelting vessel to the end of the tapping. preferable.
  • the introduction of the deoxidizer from the charging chute to the inside of the refining vessel is started simultaneously with or before the start of the spraying of the desulfurizing agent from the spray nozzle. Is preferred.
  • the molten iron is exemplified as molten steel.
  • the smelting furnace is exemplified as a smelting furnace that performs primary smelting in steelmaking that performs secondary smelting, specifically a converter, and an example that the smelting vessel is a ladle. Is done.
  • the desulfurizing agent since the desulfurizing agent is sprayed onto the outgoing stream, the desulfurizing agent can be increased in the molten iron by using the blowing of the desulfurizing agent to the outgoing stream and the stirring force of the outgoing stream. For this reason, a desulfurization rate can be raised.
  • the desulfurizing agent that cannot be fully hatched becomes dust, resulting in loss of the desulfurizing agent and problems in the working environment. .
  • a fine-grain desulfurization agent could not be used.
  • the hatching rate of the desulfurizing agent is high, and even a fine-grained desulfurizing agent can be sprayed without loss, so that the desulfurization rate can be further increased.
  • the present invention can be carried out simply by attaching a spray nozzle for releasing a desulfurizing agent to an existing charging chute. Therefore, according to the present invention, since it is not necessary to provide the lance moving device disclosed in Patent Document 2, an increase in equipment cost and an increase in equipment size can be prevented.
  • FIG. 1 is an explanatory view showing a configuration of a molten steel desulfurization apparatus according to the present invention.
  • FIG. 2 is a graph showing the desulfurization rate when the desulfurizing agents CaO—CaF 2 and CaO—Al 2 O 3 are used in the present invention example and the conventional example.
  • the molten iron is molten steel and the refining furnace is a converter that is a refining furnace that performs primary refining in steelmaking that performs secondary refining, and the refining vessel is a ladle is taken as an example.
  • “%” related to chemical composition or concentration means “mass%” unless otherwise specified.
  • FIG. 1 is an explanatory view showing a configuration of a molten steel desulfurization apparatus 0 according to the present invention.
  • the desulfurization apparatus 0 is an apparatus for adding a desulfurizing agent 7 to the molten steel 11 during steelmaking after primary refining in steelmaking for secondary refining.
  • the desulfurization apparatus 0 includes a spraying facility 6.
  • the spraying equipment 6 sprays the desulfurizing agent 7 on the steel output stream 11 that is discharged from the converter 1 that has undergone primary refining to the ladle 2 that performs secondary refining.
  • the model and kind of the converter 1 used by primary refining are not restrict
  • the spraying equipment 6 includes a spray nozzle 3, a storage container 4, and a desulfurization agent supply path 5.
  • the spray nozzle 3 is attached to the charging chute 8.
  • the charging chute 8 is provided so that the charging direction is variable in three dimensions in order to load an alloy (for example, a deoxidizer) into the ladle 2.
  • the existing chute 8 may be used.
  • the spray nozzle 3 releases the desulfurizing agent 11 and sprays the desulfurizing agent 7 to the outgoing steel flow 11 flowing down while changing the flow down position.
  • the storage container 4 stores the desulfurizing agent 7.
  • the desulfurization agent supply path 7 is a pipe, for example, and supplies the desulfurization agent 11 stored in the storage container 4 to the spray nozzle 3.
  • the spray nozzle 3 is attached to the charging chute 8 so that the direction of the injection port of the desulfurizing agent 7 is variably arranged. Thereby, the spray nozzle 3 can spray the desulfurizing agent 7 following the change in the flow-down position of the outgoing steel flow 11. That is, the spray nozzle 3 is arranged so that the spraying direction (spraying direction) of the desulfurizing agent 7 is variable in a range that covers the fluctuation range of the flow-down position of the outgoing steel flow 11.
  • the type and type of spray nozzle is not particularly limited.
  • the nozzle diameter is preferably 200 to 300 mm in order to prevent the desulfurization agent from scattering.
  • the desulfurization method according to the present invention is directed to a low-sulfur steel with [S] ⁇ 24 ppm.
  • the blowing equipment 6 is used, and the desulfurizing agent 7 is sprayed from the spray nozzle 3 to the steel outlet flow 11.
  • the energy of spraying and the stirring energy of the outgoing steel stream 11 can be effectively utilized. For this reason, the entrainment of the desulfurizing agent 7 into the outgoing steel flow 11 can be increased, and the desulfurization rate is improved.
  • the addition of a desulfurizing agent to the molten steel surface from a charging chute, etc. cannot use a fine-grained desulfurizing agent.
  • a fine desulfurizing agent 7 having a particle diameter of 0.5 to 1.0 mm can be used.
  • the particle size of the desulfurizing agent 7 is finer, the surface area contributing to the desulfurization reaction increases, and therefore the desulfurization rate can be further increased.
  • the particle size of the desulfurizing agent 7 is smaller than 0.5 mm, the desulfurizing agent that cannot be completely hatched is dusted.
  • the particle size of the desulfurizing agent 7 is larger than 1.0 mm, the desulfurization rate decreases.
  • the composition of the desulfurizing agent 7 is not particularly limited as long as it is a composition generally used as a desulfurizing agent.
  • CaO alone or a composition CaO—CaF 2 or CaO—Al 2 O 3 in which CaF 2 or Al 2 O 3 is partially added to CaO is exemplified.
  • the amount of desulfurizing agent added is not limited.
  • the blowing direction of the blowing nozzle 3 is made to follow the outgoing steel flow 11 flowing down while changing the flow down position, and the desulfurizing agent 7 is continuously sprayed onto the outgoing steel flow 11.
  • the diameter of the steel outlet 13 of the converter 1 is generally 150 to 250 mm, and the diameter of the steel outlet is 1100 to 1300 mm. For this reason, the outgoing steel flow 11 is thinner than the hot metal flow. Furthermore, the outgoing steel flow 11 flows down while changing the flow down position in the horizontal plane due to the tilt angle of the converter 1 or partial clogging of the outgoing steel port 13.
  • the spraying direction of the desulfurizing agent 7 is likely to deviate from the outgoing steel flow 11, and the desulfurization rate is likely to decrease.
  • the blowing direction of the blowing nozzle 3 follows the outgoing steel flow 11, the loss of the desulfurizing agent 7 can be prevented.
  • the spraying position at which the desulfurizing agent 7 is sprayed onto the outgoing steel flow 11 is above the half height position between the outgoing steel outlet 13 and the molten steel surface 12 in the ladle 2.
  • the desulfurizing agent 7 can be introduced into the molten metal surface 12 together with the outgoing steel flow 11 from a higher position, and the stirring power can be increased using the potential energy.
  • An inert gas can be used for spraying the desulfurizing agent 7.
  • the inert gas is preferably Ar gas or N 2 gas.
  • the spray pressure of the desulfurizing agent 7 is preferably 0.5 to 1.0 MPa.
  • the spraying of the desulfurizing agent 7 from the spray nozzle 3 to the outgoing steel flow 11 is not less than 3/4 of the period from the start of the molten steel output from the converter 1 to the ladle 2 until the end of the outgoing steel. In order to increase the desulfurization rate, it is preferable to carry out for a period, most preferably for the whole period.
  • the desulfurization reaction is a reduction reaction represented by the following formula (1). For this reason, if the concentration of oxygen in the molten steel and the concentration of oxides such as FeO and MnO in the slag are high, the desulfurization rate is reduced due to the reverse reaction. The desulfurization rate can be further increased by lowering the concentration of oxygen in the molten steel and the concentration of oxide in the slag by introducing a deoxidizer from the input chute 8.
  • CaO + [S] CaS + [O] (1)
  • deoxidizer it is not necessary to spray the deoxidizer on the outgoing steel flow 11, and various methods such as placing in the ladle 2 and adding to the outgoing steel flow 11 can be used. Moreover, what is generally used can be used for a deoxidizer, and it does not restrict
  • the present invention can be carried out only by mounting the spray nozzle 3 for releasing the desulfurizing agent 7 on the existing charging chute 8. Therefore, according to the present invention, since it is not necessary to provide the lance moving device disclosed in Patent Document 2, an increase in equipment cost and an increase in equipment size can be prevented.
  • the desulfurization rate was calculated
  • FIG. In other words, a desulfurizing agent was added when the molten steel 7 was blown (primary refining) by the converter 1 by conventional means, and the desulfurization rate was obtained from [S] before and after the steel output.
  • the size of the steel outlet hole 13 of the converter 1 is 250 mm.
  • the desulfurizing agent 7 was added by spraying the outgoing steel stream 11 using the spraying device 0.
  • the nozzle diameter of the spray nozzle 3 is 200 mm.
  • Ar gas was used as a carrier gas for the desulfurizing agent 7.
  • the spray nozzle 3 for the desulfurizing agent 7 is disposed at the upper center of the charging chute 8 so that the blowing direction of the desulfurizing agent 7 in the horizontal plane coincides with the charging direction from the charging chute 8 in the horizontal plane. It is fixed and arranged by appropriate means such as welding or fastening.
  • the blowing direction of the desulfurizing agent 7 from the blowing nozzle 3 is changed to the direction toward the outgoing steel flow 11 as the charging chute 8 is operated to change the charging direction toward the ladle 2. Be changed.
  • the desulfurizing agent 7 is made to follow the fluctuation of the flow-down position of the output steel flow 11 for the entire period from the start of the steel discharge of the molten steel 11 from the converter 1 to the ladle 2 until the end of the steel output. Continued to spray.
  • the spraying position of the desulfurizing agent 7 to the outgoing steel flow 11 was set above the half height position between the outgoing steel spout 13 and the molten metal surface 12.
  • Table 1 shows the conditions of the present invention example and the conventional example.
  • Table 1 shows the chemical composition and molten steel temperature of the molten steel (after steelmaking).
  • the particle size of the desulfurizing agent was ⁇ 5 mm in the conventional example, and 0.5 to 1.0 mm in the example of the present invention.
  • the input amount of the desulfurizing agent was 5 kg / t.
  • FIG. 2 is a graph showing the desulfurization rate when the desulfurizing agents CaO—CaF 2 and CaO—Al 2 O 3 are used in the present invention example and the conventional example.
  • the black column in the graph of FIG. 2 is an example of the present invention, and the white column is a conventional example.
  • the desulfurization rate of the present invention example was about 1.2 times the desulfurization rate of the comparative example. is there.
  • a desulfurizing agent 7 having a particle diameter of 0.5 to 1 mm was introduced into the ladle 2 from the introduction chute 8. However, it was confirmed visually that the desulfurizing agent 7 which could not be hatched was dusted, and the suspension in the molten steel in the ladle 2 could not be confirmed and was not mixed.
  • Desulfurization apparatus 1 according to the present invention Refining furnace (converter, etc.) 2 Refining container (ladder) 3 Spray nozzle 4 Container (hopper) 5 Piping 6 Spraying equipment 7 Desulfurization agent 8 Input chute 11 Steel flow 12 Hot water surface 13 Steel outlet

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
PCT/JP2017/016091 2016-04-25 2017-04-21 溶鉄の脱硫方法及び脱硫装置 WO2017188159A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2018514569A JP6521177B2 (ja) 2016-04-25 2017-04-21 溶鉄の脱硫方法及び脱硫装置
KR1020187033618A KR102300458B1 (ko) 2016-04-25 2017-04-21 용철의 탈황 방법 및 탈황 장치
CN201780025893.7A CN109072320B (zh) 2016-04-25 2017-04-21 铁水的脱硫方法和脱硫装置

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JP2016086923 2016-04-25
JP2016-086923 2016-04-25

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WO2017188159A1 true WO2017188159A1 (ja) 2017-11-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108588330A (zh) * 2018-06-07 2018-09-28 王琼 一种钢水在出钢过程中自动增碳系统及方法

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KR102334956B1 (ko) 2018-11-01 2021-12-02 주식회사 엘지화학 차량용 램프 및 이의 제조 방법
EP3670677A1 (en) * 2018-12-17 2020-06-24 S.A. Lhoist Recherche Et Developpement Process for manufacturing a slag conditioning agent for steel desulfurization
CN110747315A (zh) * 2019-11-18 2020-02-04 张家港宏昌钢板有限公司 一种高效铁水脱硫装置

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EP0340711A2 (de) * 1988-05-03 1989-11-08 Thyssen Stahl Aktiengesellschaft Verfahren und Vorrichtung zur Zugabe von Legierungsmitteln in einen Metallgiessstrahl
JPH09316525A (ja) * 1996-05-31 1997-12-09 Nippon Steel Corp 電気炉出湯時の溶湯脱硫方法および装置
JPH11199019A (ja) * 1998-01-07 1999-07-27 Kawasaki Steel Corp 副原料投入用旋回シュート
JP2005187901A (ja) * 2003-12-26 2005-07-14 Jfe Steel Kk 溶鋼の精錬方法

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JP2988305B2 (ja) 1995-02-23 1999-12-13 住友金属工業株式会社 溶鋼の脱硫方法
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KR20030054521A (ko) * 2001-12-26 2003-07-02 주식회사 포스코 전로 출강 중 기체취입 장치
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Publication number Priority date Publication date Assignee Title
JPS5123420A (en) * 1974-06-07 1976-02-25 Nippon Steel Corp Shutsukochuyokoheno tenkazaitonyusochi
EP0340711A2 (de) * 1988-05-03 1989-11-08 Thyssen Stahl Aktiengesellschaft Verfahren und Vorrichtung zur Zugabe von Legierungsmitteln in einen Metallgiessstrahl
JPH09316525A (ja) * 1996-05-31 1997-12-09 Nippon Steel Corp 電気炉出湯時の溶湯脱硫方法および装置
JPH11199019A (ja) * 1998-01-07 1999-07-27 Kawasaki Steel Corp 副原料投入用旋回シュート
JP2005187901A (ja) * 2003-12-26 2005-07-14 Jfe Steel Kk 溶鋼の精錬方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108588330A (zh) * 2018-06-07 2018-09-28 王琼 一种钢水在出钢过程中自动增碳系统及方法

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CN109072320A (zh) 2018-12-21
TWI652350B (zh) 2019-03-01
JP6521177B2 (ja) 2019-05-29
JPWO2017188159A1 (ja) 2018-09-27
KR102300458B1 (ko) 2021-09-09
CN109072320B (zh) 2021-01-05
KR20180132918A (ko) 2018-12-12
TW201800583A (zh) 2018-01-01

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