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WO2018150858A1 - Dispositif de déphosphoration et procédé de déphosphoration pour métal chaud faisant appel audit dispositif - Google Patents

Dispositif de déphosphoration et procédé de déphosphoration pour métal chaud faisant appel audit dispositif Download PDF

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Publication number
WO2018150858A1
WO2018150858A1 PCT/JP2018/002765 JP2018002765W WO2018150858A1 WO 2018150858 A1 WO2018150858 A1 WO 2018150858A1 JP 2018002765 W JP2018002765 W JP 2018002765W WO 2018150858 A1 WO2018150858 A1 WO 2018150858A1
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WIPO (PCT)
Prior art keywords
hot metal
dephosphorization
powder
mass
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/JP2018/002765
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English (en)
Japanese (ja)
Inventor
政樹 宮田
紀史 浅原
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 KR1020197007367A priority Critical patent/KR102164124B1/ko
Priority to CN201880003733.7A priority patent/CN109790590B/zh
Priority to JP2018568081A priority patent/JP6773142B2/ja
Publication of WO2018150858A1 publication Critical patent/WO2018150858A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • C21C5/35—Blowing from above and 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
    • 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
    • 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
    • C21C5/48—Bottoms or tuyéres of converters

Definitions

  • the present invention relates to a dephosphorization apparatus suitable for producing ultra-low phosphorus hot metal at low cost and high efficiency while suppressing spitting, and a hot metal dephosphorization method using the same.
  • hot metal dephosphorization is widely performed by a method in which the hot metal is treated under low temperature conditions in a hot metal stage, which is thermodynamically advantageous.
  • an upper bottom blowing converter is suitable as the hot metal dephosphorization apparatus. This is because, as an oxidant necessary for dephosphorization, gaseous oxygen with less heat loss than a solid oxidant can be sprayed from the top blowing lance to the hot metal at high speed.
  • CaO powder, Al 2 O 3 powder and Fe 2 O 3 are obtained from the top blowing lance.
  • a method of spraying mixed powder containing powder onto a hot metal bath surface together with an oxygen gas jet is disclosed (see Patent Document 1).
  • Al 2 O 3 or Fe 2 O 3 reacts with CaO to easily form a low melting point CaO—Al 2 O 3 —FeO melt, and the dephosphorization reaction proceeds very efficiently.
  • the top-blown mixed powder is penetrated deeply into the hot metal bath to increase the dephosphorization utilization efficiency of the CaO—Al 2 O 3 —FeO melt and reduce [P] in the hot metal to a very low concentration.
  • the blowing jet dynamic pressure is increased, spitting increases and the amount of metal adhesion to the furnace increases.
  • a CaO-containing cover slag is formed in the first half of blowing, and the basicity (weight ratio: CaO / SiO 2 ) of the cover slag is 0.4 to 1.5, and thereafter, CaO powder and Al 2 O 3 powder and A hot metal dephosphorization method in which a mixed powder of Fe 2 O 3 powder is blown up is disclosed (see Patent Document 2).
  • the amount of spitting can be reduced by forming a cover slag having a low melting point in the first half of dephosphorization blowing.
  • the present invention aims to provide a dephosphorization processing apparatus capable of producing an extremely low phosphorus hot metal at a low cost and with high efficiency while suppressing spitting, and a hot metal dephosphorization method using the same.
  • molten iron is charged into a converter having an upper bottom blowing, and either one of CaO powder and CaCO 3 powder together with oxygen gas from an upper blowing lance having 4 to 6 nozzles or
  • the mixed powder of both and Al 2 O 3 powder was sprayed onto the hot metal bath surface, and gas was blown from the bottom blowing tuyere of the same number as the top blowing nozzle, and the adhesion behavior and dephosphorization behavior in the furnace by spitting were investigated.
  • the present inventors have found a dephosphorization processing apparatus capable of melting extremely low phosphorus hot metal ([C] ⁇ 3.2 mass%, [P] ⁇ 0.015 mass%) and a melting method using the apparatus.
  • the present invention is as follows. (1) A dephosphorization apparatus for dephosphorizing hot metal, A converter, An upper blowing lance for blowing a powder dephosphorizing agent and oxygen gas into the converter; An oxygen supply device for supplying the oxygen gas to the upper blowing lance; A powder supply device for supplying the powder dephosphorizing agent to the upper blowing lance, A plurality of nozzles for ejecting the powder dephosphorizing agent and the oxygen gas are disposed on the lower end surface of the upper blowing lance, At the bottom of the converter, the same number of bottom blowing tuyeres as the nozzles are arranged, With the hot metal having a bath depth L 0 charged in the converter, the position U of the intersection of the central axis of the top blowing jet ejected from the nozzle and the bath surface of the hot metal and the bottom blowing tuyere In each of the sets of nozzles and bottom blowing tuyere where the distance (the length of the line segment SU) between the straight line drawn
  • the powder dephosphorizing agent is a mixed powder of a powder mainly composed of a CaO source and a powder mainly composed of an Al 2 O 3 source, and includes 3 of CaO, CaCO 3 and Al 2 O 3 .
  • the total mass concentration of the components of 90% or more, and characterized in that it is a mixed powder is 0.05 ⁇ 0.20 (Al 2 O 3 by weight) / (CaO mass + CaCO 3 mass ⁇ 0.56) Dephosphorization processing apparatus as described in said (1).
  • the plurality of nozzles are arranged concentrically with respect to the central axis of the upper blowing lance, and the inclination angle ⁇ between the central axis of the upper blowing lance and the central axis of the nozzle is the same for all nozzles.
  • the dephosphorization processing apparatus according to any one of the above (1) to (3), wherein an inclination angle ⁇ between the first and the second is 25 ° or less.
  • a hot metal dephosphorization method using the dephosphorization apparatus according to any one of (1) to (4) above,
  • the molten iron is held in the converter, and N 2 gas is blown into the molten iron from the bottom blowing tuyere at a flow rate of 0.1 to 0.60 Nm 3 / min / t, and the length of the line segment SU is increased.
  • the height of the upper blowing lance is adjusted so as to satisfy the condition of the formula (1) in all of the nozzle and bottom blowing tuyere that is minimized, and the powder dephosphorizing agent is adjusted from the upper blowing lance. Is sprayed onto the molten iron together with the oxygen gas of 1.0 to 2.5 Nm 3 / min / t, so that the charging basicity at the end of the treatment is 1.5 to 2.5.
  • the present invention it is possible to provide a dephosphorization processing apparatus capable of producing ultra-low phosphorus hot metal with low cost and high efficiency while suppressing spitting, and a hot metal dephosphorization method using the same.
  • FIG. 1A is a diagram for explaining the position of a bottom blowing tuyere in the embodiment.
  • FIG. 1B is a diagram for explaining the position of the bottom blowing tuyere in the embodiment.
  • FIG. 2 is a diagram showing a plurality of fire point positions and a plurality of bottom blowing tuyere positions as seen from the axial direction of the top blowing lance.
  • FIG. 1A and 1B are diagrams for explaining the position of the bottom blowing tuyere in the present embodiment.
  • FIG. 2 is a figure which shows the position of several fire spots and the position of several bottom blowing tuyere seen from the axial direction of the top blowing lance.
  • Dephosphorization processing apparatus includes a converter, a top-blown lance, an oxygen supply device, and a powder supplying device, the bottom of the converter, such as N 2 gas or Ar gas
  • a plurality of bottom blowing tuyere for blowing an inert gas into the hot metal is provided.
  • nozzles for ejecting a powder dephosphorizing agent together with oxygen are installed at the lower end of the upper blowing lance.
  • the height of the upper blowing lance is adjusted so that the lance height becomes H 0, and the jet is injected from the upper blowing lance, A hot spot consisting of a high temperature part of 2000 ° C. or higher is formed on the hot metal bath surface by colliding with the surface.
  • four nozzles are concentrically arranged, and the angles (inclination angles) ⁇ formed by the central axes of these nozzles and the central axis of the upper blowing lance are all the same.
  • FIG. 2 An example is shown, and as shown in FIG. 2, when jets are injected, the centers U 1 to U 4 of the fire points are formed concentrically.
  • the centers U 1 to U 4 of these fire points are adjusted by adjusting the height of the top blowing lance so that the distance from the intersection point O between the center axis of the top blowing lance and the hot metal is equal to the x axis or the y axis. Move up.
  • the bottom blowing tuyere of the same number as the number of nozzles is provided at the bottom of the converter, and when adjusting the height of the top blowing lance, the center of fire point U 1 to U 4 and The lance height H 0 is adjusted so that all the positions S 1 to S 4 of the bath surface directly above the bottom blowing tuyere positions T 1 to T 4 are equal to or less than a predetermined distance.
  • the value of the lance height H 0 is adjusted by moving the upper blowing lance up and down so that the center U 1 to U 4 of the fire point is the target position.
  • FIG. 1A and FIG. 1B it demonstrates as a combination of the nozzle and bottom blowing tuyere which the length of line segment SU becomes the minimum. That is, in FIG. 2, the combination is a line segment S 1 U 1 , a line segment S 2 U 2 , a line segment S 3 U 3 , and a line segment S 4 U 4 .
  • the bottom blowing gas blown into the hot metal from the bottom blowing tuyere rises while spreading at 12 ° on one side.
  • the region where the bottom blowing gas and hot metal are mixed is referred to as a plume region.
  • the plume region has a low density and is vigorously stirred and mixed as compared to the surrounding hot metal bath.
  • FIG. 1B when the powder dephosphorizing agent blown from the top blowing lance together with oxygen is blown into this plume region, the powder dephosphorizing agent can penetrate deeply into the molten iron and is vigorously stirred and mixed.
  • the dephosphorization utilization efficiency of CaO in the powder dephosphorizing agent is greatly improved, and [P] in the hot metal after the treatment is reduced to a very low concentration.
  • a powder dephosphorizing agent is sprayed together with oxygen from an upper blowing lance.
  • the powder dephosphorizing agent is mainly composed of a powder mainly composed of a CaO source and an Al 2 O 3 source.
  • a mixed powder with the powder to be used is used.
  • the powder mainly composed of the CaO source preferably has a total mass concentration of CaO and CaCO 3 of 90% or more, and is more preferably either quick lime (CaO) or limestone (CaCO 3 ) or a mixed powder.
  • the reason why the total mass concentration of CaO and CaCO 3 is preferably 90% or more is that if it is less than 90%, a lot of components other than CaO and CaCO 3 are mixed, and slag forming becomes excessive during the dephosphorization process, resulting in slag. This is because the risk of overflowing from the furnace opening or poor dephosphorization increases.
  • the powder mainly composed of an Al 2 O 3 source preferably has an Al 2 O 3 mass concentration of 50% or more.
  • slag and refractories having a high Al 2 O 3 mass concentration are also available. Examples of such waste materials are exemplified.
  • the total mass concentration of the three components of CaO, CaCO 3 and Al 2 O 3 is preferably 90% or more.
  • the reason for this is the same as the reason that the total mass concentration of CaO and CaCO 3 is preferably 90% or more.
  • the maximum particle size of these powders is preferably 0.5 mm or less, more preferably 0.15 mm or less from the viewpoint of ease of conveying the powder by gas and securing the reaction interface area in the hot metal. .
  • the mixing ratio between the powder mainly composed of CaO source and the powder mainly composed of Al 2 O 3 source will be described later.
  • the mixed powder is held in the dispenser of the powder supply device.
  • the mixed powder is directly discharged from the dispenser to the upper blowing lance or via the oxygen gas line.
  • oxygen is also supplied from the oxygen supply device to the upper blowing lance, and the mixed powder is sprayed onto the molten iron together with oxygen from the upper blowing lance.
  • a powder in which a powder mainly composed of a CaO source and a powder mainly composed of an Al 2 O 3 source are mixed (total mass concentration of three components of CaO, CaCO 3 and Al 2 O 3 is 90 % And more than (Al 2 O 3 mass) / (CaO mass + CaCO 3 mass ⁇ 0.56) is 0.03 to 0.25 mixed powder)
  • the lance height H 0 is 2500 to 3500 mm and the oxygen gas is 0.8 to 2.7 Nm 3 / min / t.
  • the hot metal was sprayed on the hot metal bath to perform hot metal dephosphorization.
  • the degree (CaO / SiO 2 mass ratio) was 1.3 to 2.7, and the blowing time was 6 to 10 minutes.
  • the charge basicity is a value calculated by (CaO charge mass) / (SiO 2 charge mass + SiO 2 production mass due to oxidation of [Si] in the hot metal).
  • the angle ⁇ formed by the line segment TS and the line segment TU represents the angle ⁇ shown in FIG. 1A, and the top blowing nozzle and the bottom blowing tuyere that minimize the length of the line segment SU.
  • the maximum angle is represented.
  • all the nozzles were concentrically arranged with respect to the central axis of the upper blowing lance, and the inclination angle was appropriately selected from the range of 12 ° to 18 °, with the same angle for each lance.
  • the bottom blowing tuyere is No. 1-No.
  • the top blowing jet collides with the center of the plume region. is doing.
  • the top blown mixed powder blown into the plume region which has a low density and is vigorously stirred and mixed as compared to the surrounding hot metal bath, can penetrate deeply and is vigorously stirred and mixed. It is considered that the dephosphorization utilization efficiency of CaO was greatly improved, and [P] in the molten iron after the treatment was reduced to an extremely low concentration. In addition, it is considered that spitting is reduced because the kinetic energy of the top blowing jet is efficiently consumed in the plume region.
  • the position of the fire point is an inappropriate position, and if the upper blowing lance is adjusted in the vertical direction, the length of the line segment SU is minimized.
  • the line segment SU There are two possible cases in which it is impossible for all combinations of nozzles and bottom blowing tuyeres having the minimum length to have the length of the line segment SU ⁇ L 0 tan 6 °.
  • the amount of metal adhesion to the vicinity of the furnace port due to spitting varied depending on the position of the center U of the fire point.
  • the collision position of the top blowing jet on the hot metal bath surface (fire point center U) is closer to the position O of the intersection of the top blowing lance central axis and the hot metal, the amount of spitting scattered upwards increases.
  • the center U of the hot spot is further away from the position O, the amount of spitting that scatters vertically upward decreases.
  • the length of the line segment OS is preferably 300 mm or more. This is because if there is a bottom blowing tuyere whose length of the line segment OS is less than 300 mm, the inclination angle ⁇ of the top blowing jet becomes small, and the amount of spitting upward in the vertical direction increases.
  • the inclination angle ⁇ of the nozzle of the top blowing lance is 25 ° or less. This is because if a nozzle having an excessively large inclination angle ⁇ is present, secondary combustion due to the top blown oxygen jet increases, and refractory damage to the converter furnace wall becomes severe.
  • the top blowing oxygen flow rate was set to 0.8 to 2.7 Nm 3 / min / t, and other conditions were set as basic conditions.
  • the top blowing oxygen flow rate was less than 1.0 Nm 3 / min / t, [P] in the hot metal after the treatment did not decrease to 0.015 mass% or less.
  • the blowing time is 6 to 10 minutes, it is considered that oxygen necessary to make [P] in the molten iron after treatment be 0.015% by mass or less, which is an extremely low concentration, is insufficient.
  • Fe in the hot metal is oxidized by the top blowing oxygen to produce FeO, and the top blowing powder is melted to form a FeO—CaO based melt.
  • FeO is reduced by [C] in the hot metal, the FeO concentration in the melt is likely to decrease.
  • the melting point of the FeO—CaO melt increases and the fluid state cannot be maintained, so that the dephosphorization utilization efficiency of the melt decreases.
  • the melt contains a small amount of Al 2 O 3 , the melting point of the melt will be significantly lowered, so that it should be possible to maintain the molten state and maintain high dephosphorization utilization efficiency.
  • 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.
  • the depth L 0 of the still bath at this time was 2000 mm.
  • N 2 gas was blown into the molten iron from the four bottom blowing tuyere at a flow rate of 0.25 Nm 3 / min / t and stirred, and from the top blowing lance in which four nozzles having an inclination angle of 17 ° were arranged,
  • the height H 0 is 2800 mm
  • the total mass concentration of the three components of CaO, CaCO 3 and Al 2 O 3 is 95% together with oxygen gas 2.0 Nm 3 / min / t
  • (Al 2 O 3 mass) / A mixed powder having a CaO mass + CaCO 3 mass ⁇ 0.56) of 0.10 and a maximum particle size of 0.15 mm was sprayed, and the charging basicity at the end of the treatment was set to 1.8.
  • the distance between the intersection point O between the center axis of the top blowing lance and the hot metal bath surface and the position S of the hot metal bath surface drawn from the position T of the bottom blowing tuyere vertically (the length of the line segment OS) was 860 mm, common to all bottom blowing tuyere.
  • a line drawn vertically upward from the position of the intersection of the central axis of the jet of the top blown oxygen + mixed powder and the hot metal bath surface (center of the fire point) U and the position T of the bottom blow tuyere and the hot metal bath surface The position S of the intersections of these points almost coincided at any of the fire points.
  • the angle ⁇ formed by the line segment TS and the line segment TU was almost 0 °.
  • the final blowing temperature was 1342 ° C.
  • [C] in the molten iron after the treatment was 3.4 mass% and [P] was 0.006 mass%.
  • N 2 gas was blown into the molten iron from the four bottom blowing tuyere at a flow rate of 0.25 Nm 3 / min / t and stirred, and from the top blowing lance in which four nozzles with an inclination angle of 12 ° were arranged, the lance height H 0 is 2700 mm, the total mass concentration of the three components of CaO, CaCO 3 and Al 2 O 3 together with oxygen gas 2.0 Nm 3 / min / t is 95%, and (Al 2 O 3 mass) / (CaO mass + CaCO 3 mass ⁇ 0.56) is 0.10, and the mixed powder having the maximum particle size of 0.15 mm was sprayed, and the charging basicity at the end of the treatment was set to 1.8.
  • the distance between the intersection point O between the center axis of the top blowing lance and the hot metal bath surface and the position S of the hot metal bath surface drawn from the position T of the bottom blowing tuyere vertically (the length of the line segment OS) was 860 mm, common to all bottom blowing tuyere.
  • the present invention it is possible to provide a dephosphorization processing apparatus capable of producing ultra-low phosphorus hot metal at a low cost and high efficiency while suppressing spitting, and a hot metal dephosphorization method using the same.
  • the 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)
  • 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

Selon l'invention, des buses et un nombre égal de tuyères de soufflage inférieures sont disposées au fond d'un four convertisseur de telle sorte que, dans un état dans lequel du métal chaud est chargé dans le four convertisseur à une profondeur de bain L0, et pour chaque paire de buse et de tuyère de soufflage inférieure où la distance (longueur du segment de ligne SU) entre la position U à l'intersection de l'axe central d'un jet ascendant pulvérisé à partir de la buse et la surface fondue du métal chaud et de la position S à l'intersection d'une ligne droite tracée verticalement vers le haut à partir de la position de la tuyère de soufflage inférieure et la surface fondue du métal chaud est réduite au minimum, une lance supérieure est positionnée à une hauteur satisfaisant la condition de longueur de segment de ligne SU ≤ L0∙tan 6°.
PCT/JP2018/002765 2017-02-15 2018-01-29 Dispositif de déphosphoration et procédé de déphosphoration pour métal chaud faisant appel audit dispositif Ceased WO2018150858A1 (fr)

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KR1020197007367A KR102164124B1 (ko) 2017-02-15 2018-01-29 탈인 처리 장치 및 그것을 사용한 용선의 탈인 방법
CN201880003733.7A CN109790590B (zh) 2017-02-15 2018-01-29 脱磷处理装置及使用了该装置的铁液的脱磷方法
JP2018568081A JP6773142B2 (ja) 2017-02-15 2018-01-29 脱りん処理方法

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JP2017-026111 2017-02-15

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US20220195546A1 (en) * 2019-04-22 2022-06-23 Nippon Steel Corporation Method for producing chromium-containing molten iron

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JP6726437B1 (ja) * 2020-05-29 2020-07-22 ダイヤモンドエンジニアリング株式会社 機械攪拌式脱硫システム
CN117480263A (zh) * 2021-06-28 2024-01-30 杰富意钢铁株式会社 供给热量推定方法、供给热量推定装置、供给热量推定程序和高炉的操作方法
US20250243554A1 (en) * 2022-04-22 2025-07-31 Jfe Steel Corporation Method for producing grained iron, and grained iron

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CN109790590B (zh) 2021-01-12
TW201833336A (zh) 2018-09-16
TWI664295B (zh) 2019-07-01
KR102164124B1 (ko) 2020-10-12
JP6773142B2 (ja) 2020-10-21
CN109790590A (zh) 2019-05-21
KR20190040011A (ko) 2019-04-16

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