WO2016158714A1 - 上底吹き転炉の操業方法 - Google Patents

上底吹き転炉の操業方法 Download PDF

Info

Publication number
WO2016158714A1
WO2016158714A1 PCT/JP2016/059541 JP2016059541W WO2016158714A1 WO 2016158714 A1 WO2016158714 A1 WO 2016158714A1 JP 2016059541 W JP2016059541 W JP 2016059541W WO 2016158714 A1 WO2016158714 A1 WO 2016158714A1
Authority
WO
WIPO (PCT)
Prior art keywords
lance
blown
tuyere
point
converter
Prior art date
Application number
PCT/JP2016/059541
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
幸雄 ▲高▼橋
勝太 天野
聡典 田和
内田　祐一
三木　祐司
Original Assignee
Ｊｆｅスチール株式会社
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 Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to KR1020177025588A priority Critical patent/KR102026765B1/ko
Priority to CN201680017773.8A priority patent/CN107429303B/zh
Priority to JP2017509888A priority patent/JP6358454B2/ja
Priority to BR112017021087-8A priority patent/BR112017021087B1/pt
Priority to EP16772595.1A priority patent/EP3279340B1/en
Publication of WO2016158714A1 publication Critical patent/WO2016158714A1/ja

Links

Images

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
    • 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
    • C21C5/4606—Lances or injectors
    • 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 method for operating an upper bottom blowing converter that is effective when it is intended to suppress the wear of the furnace wall refractories and the generation of dust.
  • top-bottom blown converters especially decarburization refining
  • operations with increased oxygen gas supply per unit time are performed in order to improve productivity.
  • increasing the supply amount of oxygen gas means that iron is likely to be scattered as dust, and there is a phenomenon that it adheres to peripheral equipment, the furnace side wall, or the vicinity of the furnace port.
  • This dust is generated when bubbles generated in the furnace are separated from the molten iron bath surface with granular iron (so-called “bubble burst”) and generated when iron atoms are evaporated (so-called fume). It is known that the rate of occurrence changes as decarburization refining progresses.
  • the hot metal gradually decreases as the carbon in the decarburization reaction proceeds, so that it eventually becomes molten steel, but the hot metal stage and the molten steel stage must be clearly distinguished.
  • hot metal and molten steel are collectively referred to as “molten iron”.
  • the scattered dust (iron) is collected regardless of the cause, and is reused as an iron source.
  • recovery of iron from dust has problems that work costs increase and the operating rate of the top-bottom converter is reduced. Therefore, conventionally, in the operation at the time of decarburization refining of the top-bottom blow converter, it has been studied to suppress the generation of dust.
  • Patent Document 1 focused on a high-temperature reaction region (so-called “fire point”) exceeding 2000 ° C. formed by an oxygen jet injected from each lance nozzle of an upper blowing lance colliding with a molten iron bath surface.
  • fire point a high-temperature reaction region
  • Technology is disclosed. That is, the state in which adjacent fire spots overlap is defined by an index value called an overlap ratio, and dust is generated by adjusting the injection angle of the oxygen jet from the top blowing lance so that the value is 20% or less. It is a method of suppressing the above.
  • Patent Document 2 uses an upper blown porous lance having seven holes including the center hole, and the overlap rate is set to 30% or less, and the fire point occupying the area surrounded by the outermost periphery of the fire point.
  • a technique for suppressing dust by adjusting the injection angle of the oxygen jet from the top blowing lance so that the ratio of the total area is 75% or less is disclosed.
  • the molten iron accommodated in the top-bottom blown converter is mixed with an oxygen jet injected from the top blow lance or a stirring gas supplied from the bottom blow tuyere (for example, inert gas, oxidizing gas). Etc.).
  • an oxygen jet injected from the top blow lance or a stirring gas supplied from the bottom blow tuyere (for example, inert gas, oxidizing gas). Etc.).
  • the fluctuation of the molten iron promotes scattering of dust (especially dust caused by bubble burst). Therefore, it is important to suppress the fluctuation of the molten iron and the vibration of the furnace body in order to suppress the generation of dust.
  • suppression of the vibration of the furnace body has an effect of preventing equipment failure.
  • Patent Document 3 discloses an oxygen jet injection angle so that a fire point formed by an oxygen jet injected from an upper blowing lance and an area where the stirring gas supplied from the bottom blowing tuyere does not overlap.
  • a technique for suppressing the vibration of the furnace body by adjusting the angle in the range of 20 to 30 ° is disclosed.
  • the injection angle of the oxygen jet is excessively increased, the refractory in the top-bottom blowing converter is likely to be worn out.
  • Patent Document 4 discloses a technique for suppressing spitting by disposing a bottom blowing tuyere inside a circle formed by a plurality of fire points. However, since the high-temperature fire point is disposed near the furnace wall, the furnace wall refractory of the top-bottom blowing converter is easily worn out.
  • the object of the present invention is to solve the above-mentioned problems of the prior art, to suppress the vibration of the furnace body and the generation of dust in the operation of the decarburization refining period in the top-bottom blown converter, and to further prevent the furnace wall fire
  • the object is to propose a method of operating the top-bottom blown converter that can suppress the wear of objects.
  • an upper blowing lance (hereinafter referred to as an “upper blowing porous lance”) having a plurality of lance nozzles (oxygen jet injection nozzles).
  • the present invention uses an upper blown porous lance having a plurality of oxygen gas injection lance nozzles, and a nozzle inclination angle ⁇ () in which an oxygen jet from the lance nozzle is inclined with respect to the central axis of the upper blown porous lance.
  • the bottom blowing tuyeres are arranged at the bottom of the furnace, and the top blowing porous lance is operated in the operation of the top bottom blowing converter through which the stirring gas is blown from the bottom blowing tuyere.
  • the method of operating the top-bottom blown converter is characterized in that the degree of interference (IR) represented by the following formula (1) is 0.7 or less.
  • IR ⁇ [(r t / r bi ) ⁇ (90 ⁇ i ) / 90] / n (1)
  • n an integer greater than or equal to 2
  • ⁇ angle (°) formed by a line connecting the lance center point L C and the jet injection point G J and a line connecting the lance center point L C and the tuyere center point M C
  • r t distance (m) between the lance center point L C and the jet injection point G J
  • r b distance (m) between each tuyere center point M C and each lance center point L C of the bottom blowing tuyere
  • ⁇ i and r bi are an angle (°) and a distance (m), which are obtained for the i-th (i: 1 to n) bottom blowing tuyere, respectively.
  • the degree of interference (IR) satisfies (IR) ⁇ 0.70 when the angle ⁇ indicating the positional relationship between the lance nozzle and the bottom blowing tuyere is minimum.
  • the interference degree (IR) is 0.46 or less,
  • the lance nozzle is a Laval nozzle or a straight nozzle.
  • the upper blow porous lance has 2 to 5 lance nozzles,
  • the upper bottom blowing converter is operated by arranging the combination of the upper blowing lance and the bottom blowing tuyere so as to satisfy the interference degree (IR). Is a more preferred embodiment.
  • the present invention when decarburizing and refining using an upper-bottom blow converter, it is possible to suppress the generation of dust and improve the iron yield, and to suppress the furnace body vibration and to prevent the furnace wall from being refractory. It is possible to effectively prevent wear of objects.
  • FIG. 1 is a diagram schematically showing the relationship between a top blow porous lance to which the present invention is applied and a bottom blow tuyere.
  • the upper blow porous lance 1 has a plurality of lance nozzles 2 for injecting oxygen gas, and an oxygen jet 3 can be injected from each lance nozzle 2.
  • a plane perpendicular to the central axis of the upper blown porous lance 1 (hereinafter referred to as “xy plane”) is a molten bath surface defined by the x axis and the y axis.
  • the point where the central axis of the upper blown porous lance 1 intersects the xy plane corresponds to the origin of the coordinate axis, which is hereinafter referred to as the lance center point L C.
  • FIG. 1 shows an example in which two lance nozzles 2 are provided, the number of the lance nozzles 2 is not limited and is preferably about 2 to 5.
  • the oxygen jet 3 ejected from the upper blown porous lance 1 is jetted in a direction inclined with respect to the central axis of the upper blown porous lance 1 (hereinafter referred to as “nozzle tilt angle ⁇ (°)”).
  • the point where the oxygen jet 3 intersects the xy plane corresponds to the center point of a fire point (that is, a high-temperature reaction region exceeding 2000 ° C. formed by collision of the oxygen jet with the molten iron bath surface) 4.
  • this point is referred to as a jet injection point G J.
  • All of the plurality of lance nozzles 2 provided in the upper blown porous lance 1 have the same direction nozzle inclination angle ⁇ . Accordingly, the top blown oxygen jet 3 is also injected at the same angle.
  • FIG. 1 illustrates only one, and this will be described below as the i-th bottom blowing tuyere 5.
  • the stirring gas supplied from the bottom blowing tuyere 5 becomes bubbles and floats in the molten iron, and a region 6 (hereinafter referred to as “stirring gas floating region”) where the bubbles are densely appears.
  • the i th tuyere center point M C is shown as M Ci in FIG.
  • the distance (m) between the lance center point L C and the jet injection point G J is denoted by rt .
  • the distance r t is because it is all the nozzles inclination ⁇ of the plurality of the lance nozzles 2 same distance r t defined for each lance nozzle 2 is also the same.
  • the distance between the lance center point L C and tuyere center point M C (m) is set to r b.
  • r bi the distance between the lance center point L C and tuyere center point M C (m)
  • the inventors used an experimental upper bottom blowing converter (capacity: 5 ton) capable of supplying the stirring gas from the bottom blowing tuyere 5 at the same time as injecting the oxygen jet 3 from the upper blowing porous lance 1.
  • an experimental upper bottom blowing converter capacity: 5 ton
  • IR degree of interference
  • the top blow porous lance 1 uses a water cooling type with a triple pipe structure, and the oxygen jet 3 is jetted at the tip of the top blow porous lance 1 at a nozzle inclination angle ⁇ with respect to the central axis of the top blow porous lance 1.
  • a plurality of lance nozzles 2 that can be arranged are arranged at equal intervals on the same circumference.
  • the shape and dimensions of the lance nozzle 2 are as shown in Table 1.
  • oxygen gas flow rate: m 3 / min (normal)
  • argon gas was used as the stirring gas
  • the lance height h was 400 mm.
  • the injection started when the concentration of carbon in the molten iron was 4.0 mass%, and stopped when the concentration decreased to 0.05 mass%.
  • the combinations showing the relationship between the top blow porous lance 1 and the bottom blow tuyere 5 in this experiment are as shown in Table 2, Table 3, Table 4, and Table 5.
  • the degree of interference (IR) shown in Tables 2 and 3 is the fire point 4 formed by the upper blown oxygen jet 3 injected from the upper blown porous lance 1 colliding with the molten iron bath surface, and the bottom blown blade It is a value calculated by the following equation (1) showing the positional relationship with the stirring gas levitation region 6 formed on the molten iron bath surface by being blown into the molten iron from the mouth 5.
  • IR ⁇ [(r t / r bi ) ⁇ (90 ⁇ i ) / 90] / n (1)
  • n an integer greater than or equal to 2
  • ⁇ angle (°) formed by a line connecting the lance center point L C and the jet injection point G J and a line connecting the lance center point L C and the tuyere center point M C
  • r t distance (m) between the lance center point L C and the jet injection point G J
  • r b distance (m) between each tuyere center point M C and each lance center point L C of the bottom blowing tuyere
  • ⁇ i and r bi are an angle (°) and a distance (m) required for the i-th (i: 1 to n) bottom blowing tuyere, respectively.
  • the dust concentration in the exhaust gas was measured, and the dust generation rate (kg / [minute / molten iron ton]) was calculated using the following equation (2).
  • the average value for each level of the experiment was used for the dust generation speed, the dust concentration in the exhaust gas, and the exhaust gas flow rate in the equation (2).
  • the relationship between the average dust generation speed and the interference degree (IR) is shown in FIG.
  • Average dust generation rate [Dust concentration in exhaust gas (kg / m 3 (Normal)) ⁇ [exhaust gas flow rate (m 3 (Normal) / [minute / molten ton])) (2)
  • the degree of interference (IR) decreases, that is, the interference (degree of engagement) between the fire point 4 and the stirring gas floating region 6 decreases, the dust generation rate decreases.
  • the interference degree (IR) was less than 0.70, the average dust generation rate at the maximum value of 0.95 of the interference degree (IR) in this experiment was lower.
  • the interference degree (IR) is 0.46 or less, the average dust generation speed is greatly reduced to 1/2 or less of the maximum value of the average dust generation speed in the experimental interference degree range.
  • the interference degree (IR) is 1.0, it means that the fire point 4 and the stirring gas floating region 6 are completely overlapped.
  • the MgO concentration (mass%) in the slag was measured for each level of the experiment, and the refractory wear index was calculated using the following equation (3).
  • the refractory wear index at level 18 is 1.0.
  • the relationship between the refractory wear index and the degree of interference (IR) is shown in FIG.
  • Refractory wear index MgO concentration in the slag after the experiment (mass%) / MgO concentration (mass%) in the slag after the end of the level 18 experiment (3)
  • the influence of the interference degree (IR) on the refractory wear index is small, and the nozzle inclination angle ⁇ has a larger influence. That is, in the decarburization refining using the upper blown porous lance 1 with a nozzle tilt angle ⁇ of 23 °, the refractory wear index increases as compared with the decarburization refining using the upper blown porous lance 1 with a nozzle tilt angle ⁇ of 14 °. It has been found that the wear of the refractory tends to progress.
  • the degree of interference is limited to 0.70 or less, preferably 0.46 or less.
  • the bottom blowing tuyere 5 is disposed at a position away from the top blowing porous lance 1 (that is, the distance r bi). It has also been found that it is effective to arrange the fire point 4 and the stirring gas levitation region 6 away from each other (that is, to increase the angle ⁇ i respectively).
  • the nozzle inclination angle ⁇ is too large, there is a problem that the area of the hot spot 4 approaches the inner wall of the top-bottom blowing converter and promotes wear of the refractory, so the nozzle inclination angle ⁇ should be less than 23 °. Is preferred.
  • the number of lance nozzles 2 provided in the top blow porous lance 1 is preferably 5 (so-called 5 holes) or less. The reason is that the size of the fire point 4 can be reduced by reducing the number of the lance nozzles 2. As a result, the arrangement of the bottom blowing tuyere 5 can increase the degree of freedom, and as a result, the angle ⁇ can be easily expanded.
  • the top blow porous lance 1 that can minimize the degree of interference (IR) is only the number of nozzles: 4 and 5 (Tables 2, 3, 4, No.
  • Table 6 shows the arrangement of the lance nozzles of the used top blowing porous nozzle and the bottom blowing tuyere of the top bottom blowing converter.
  • the lance nozzle a Laval nozzle is used, and the throat diameter of the lance nozzle used at levels A and B is 82.8 mm, and the outlet diameter is 87.1 mm.
  • the throat nozzle used in the levels C and D has a throat diameter of 74.0 mm and an outlet diameter of 77.8 mm.
  • the throat nozzle used at levels E and F has a throat diameter of 67.6 mm and an outlet diameter of 71.1 mm. All of these lance nozzles are designed with an appropriate expansion pressure of 0.33 MPa.
  • Table 8 shows the flow rates of the oxygen jet and the stirring gas and the lance height.
  • Table 9 shows the degree of interference (IR) calculated from the arrangement of the used top blow porous lance and bottom blow tuyere. These values are average values obtained by performing decarburization refining by 3 charges for each level. Further, the dust generation rate is shown as a relative value where the level F dust generation rate is 1, and the refractory wear index is shown as a relative value where the level F refractory wear index is 1.
  • level A and B are more refined than the comparative examples (levels C, D, E, and F), and T.Fe in the slag at the time of refining and blowing. Were equivalent, but the dust generation rate was greatly reduced. In particular, level A was able to suppress refractory wear.

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)
PCT/JP2016/059541 2015-03-30 2016-03-25 上底吹き転炉の操業方法 WO2016158714A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020177025588A KR102026765B1 (ko) 2015-03-30 2016-03-25 상저취 전로의 조업 방법
CN201680017773.8A CN107429303B (zh) 2015-03-30 2016-03-25 顶底同吹转炉的操作方法
JP2017509888A JP6358454B2 (ja) 2015-03-30 2016-03-25 上底吹き転炉の操業方法
BR112017021087-8A BR112017021087B1 (pt) 2015-03-30 2016-03-25 Método de operação de conversor de sopro superior e inferior
EP16772595.1A EP3279340B1 (en) 2015-03-30 2016-03-25 Method of operating top and bottom blowing converter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015068542 2015-03-30
JP2015-068542 2015-03-30

Publications (1)

Publication Number Publication Date
WO2016158714A1 true WO2016158714A1 (ja) 2016-10-06

Family

ID=57004303

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/059541 WO2016158714A1 (ja) 2015-03-30 2016-03-25 上底吹き転炉の操業方法

Country Status (7)

Country Link
EP (1) EP3279340B1 (zh)
JP (1) JP6358454B2 (zh)
KR (1) KR102026765B1 (zh)
CN (1) CN107429303B (zh)
BR (1) BR112017021087B1 (zh)
TW (1) TWI585208B (zh)
WO (1) WO2016158714A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112021019932A2 (pt) * 2019-04-05 2021-12-07 Jfe Steel Corp Vaso de refinação para fusão de alta temperatura
CN113234884A (zh) * 2021-04-23 2021-08-10 甘肃酒钢集团宏兴钢铁股份有限公司 一种解决转炉顶吹气体与底吹枪位置干涉的方法
CN115466814B (zh) * 2022-08-30 2023-09-15 北京科技大学 一种提升熔池动力学特性的转炉及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000309816A (ja) * 1999-04-23 2000-11-07 Sumitomo Metal Ind Ltd 含Ｃｒ溶鋼の脱炭精錬方法
JP2002105525A (ja) * 2000-09-26 2002-04-10 Kawasaki Steel Corp 上底吹き転炉

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5757816A (en) * 1980-09-19 1982-04-07 Kawasaki Steel Corp Steel making method by composite top and bottom blown converter
JPS5816013A (ja) * 1981-07-17 1983-01-29 Kawasaki Steel Corp 上底吹転炉の操業方法および上底吹転炉操業用上吹ランス
JPS60165313A (ja) 1984-02-07 1985-08-28 Nippon Steel Corp 溶融金属精錬用上吹ランス
JP3167888B2 (ja) * 1995-07-27 2001-05-21 川崎製鉄株式会社 含クロム溶鋼の脱炭精錬方法及び精錬ガス用上吹ランス
JP4120161B2 (ja) * 2000-01-24 2008-07-16 Ｊｆｅスチール株式会社 鉄浴型溶融還元炉の操業方法
JP2002285224A (ja) 2001-03-23 2002-10-03 Nippon Steel Corp 転炉吹錬方法および転炉用吹錬ランス
DE102004016681A1 (de) * 2004-04-05 2005-12-22 Ispat Industries Ltd., Taluka-Pen Verfahren und Anlagen zum Herstellen und Erhöhen der jährlichen Produktionsmenge von Massenstahl oder hochwertigen Stahlgüten in einer Zwei-Gefäß-Anlage
JP5724761B2 (ja) * 2011-08-31 2015-05-27 Ｊｆｅスチール株式会社 転炉吹錬方法
US9580764B2 (en) * 2011-10-17 2017-02-28 Jfe Steel Corporation Top-blowing lance and method for refining molten iron using the same
JP5553179B2 (ja) 2012-01-12 2014-07-16 新日鐵住金株式会社 転炉脱炭精錬におけるスピッティング低減法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000309816A (ja) * 1999-04-23 2000-11-07 Sumitomo Metal Ind Ltd 含Ｃｒ溶鋼の脱炭精錬方法
JP2002105525A (ja) * 2000-09-26 2002-04-10 Kawasaki Steel Corp 上底吹き転炉

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3279340A4 *

Also Published As

Publication number Publication date
EP3279340A1 (en) 2018-02-07
CN107429303B (zh) 2019-12-31
CN107429303A (zh) 2017-12-01
TW201641696A (zh) 2016-12-01
BR112017021087A2 (pt) 2018-07-03
TWI585208B (zh) 2017-06-01
EP3279340A4 (en) 2018-02-07
BR112017021087B1 (pt) 2021-08-31
JPWO2016158714A1 (ja) 2017-05-25
KR102026765B1 (ko) 2019-09-30
KR20170117168A (ko) 2017-10-20
JP6358454B2 (ja) 2018-07-18
EP3279340B1 (en) 2020-11-18

Similar Documents

Publication Publication Date Title
US11293069B2 (en) Method for oxygen-blowing refining of molten iron and top-blowing lance
JP6358454B2 (ja) 上底吹き転炉の操業方法
JP5037290B2 (ja) 溶銑の脱リン処理方法
CN109790590B (zh) 脱磷处理装置及使用了该装置的铁液的脱磷方法
JP2014221928A (ja) 転炉吹錬方法
JP2006348331A (ja) 溶融金属精錬用上吹きランス及び溶融金属の吹錬方法
JP5724761B2 (ja) 転炉吹錬方法
JP5544807B2 (ja) 精錬用上吹きランス及び転炉精錬方法
JP2011202236A (ja) 転炉の上吹きランス及び転炉の操業方法
JP5915568B2 (ja) 転炉型精錬炉における溶銑の精錬方法
JP6036096B2 (ja) 転炉吹錬方法
JP6578939B2 (ja) 転炉吹錬用上吹きランス及び転炉吹錬方法
JP5884197B2 (ja) 転炉の精錬方法
JP6658365B2 (ja) 溶銑の精錬方法
JP4385855B2 (ja) 転炉吹錬方法及び転炉吹錬用上吹きランス
JP2019090078A (ja) 吹き込み用浸漬ランス及び溶融鉄の精錬方法
JP3750624B2 (ja) 底吹き転炉の炉口付着地金の除去方法
JPH1112633A (ja) 溶融金属の精錬用ランスおよび精錬方法
JP4103503B2 (ja) 溶銑の脱燐方法
JP2010189668A (ja) 転炉の操業方法
JPH1192815A (ja) ダスト発生を抑制する転炉吹錬法
JP5488025B2 (ja) 転炉炉口付着地金の溶解方法
JP2019059990A (ja) 溶銑の脱珪処理方法
JPH02166211A (ja) 溶融還元法および溶融還元炉
JPH07138631A (ja) 転炉吹錬用ランス

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16772595

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2017509888

Country of ref document: JP

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20177025588

Country of ref document: KR

Kind code of ref document: A

REEP Request for entry into the european phase

Ref document number: 2016772595

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112017021087

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112017021087

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20170929