WO2013179541A1 - ベルレス高炉への原料装入方法 - Google Patents

ベルレス高炉への原料装入方法 Download PDF

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Publication number
WO2013179541A1
WO2013179541A1 PCT/JP2013/001857 JP2013001857W WO2013179541A1 WO 2013179541 A1 WO2013179541 A1 WO 2013179541A1 JP 2013001857 W JP2013001857 W JP 2013001857W WO 2013179541 A1 WO2013179541 A1 WO 2013179541A1
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Prior art keywords
furnace
coke
batch
ore
raw material
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Ceased
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PCT/JP2013/001857
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English (en)
French (fr)
Japanese (ja)
Inventor
琢哉 夏井
中野　薫
隆信 稲田
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Publication date
Application filed by Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Priority to EP13797875.5A priority Critical patent/EP2857529A4/en
Priority to JP2014518235A priority patent/JP5696814B2/ja
Priority to CN201380028508.6A priority patent/CN104364397B/zh
Priority to IN10251DEN2014 priority patent/IN2014DN10251A/en
Priority to KR1020147034414A priority patent/KR101579031B1/ko
Publication of WO2013179541A1 publication Critical patent/WO2013179541A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge

Definitions

  • the present invention relates to a raw material charging method into a bell-less blast furnace capable of controlling the gas flow in the vicinity of the furnace wall without significantly increasing the reducing material ratio of the blast furnace.
  • the bell-less blast furnace is a blast furnace provided with a bell-less charging device equipped with a turning chute as a raw material charging device at the top of the furnace.
  • FIG. 1 is a diagram schematically illustrating an apparatus configuration at the top of a bell-less blast furnace and a material deposition state in the blast furnace.
  • iron ore sintered ore, lump ore, pellets, scrap, reduced iron, etc.
  • raw material reducing material coke
  • auxiliary fuel such as pulverized coal
  • the charged raw material which is the raw material charged in the blast furnace, is heated and reduced by the rising high temperature gas and coke in the charged material while gradually descending the furnace from the top of the furnace. Melts into pig iron and is discharged from the tap hole in the side wall of the furnace bottom.
  • the charge distribution operation is performed by turning the turning chute 1 while charging the coke and ore into the furnace, and the coke and ore in the direction of the furnace mouth radius 4 at the raw material stock level 3. This is done by controlling the drop position.
  • tilting means changing the angle formed by the central axis 1a of the turning chute and the central axis 2a in the vertical direction of the blast furnace during turning.
  • the turning chute is arranged on the furnace wall side at the start of charging, and is then operated so as to tilt gradually toward the furnace center side.
  • a series of charging operations for forming a coke layer and an ore layer (mainly ore but may include small and medium-sized coke) is referred to as charging.
  • charging a series of charging operations for forming a coke layer and an ore layer (mainly ore but may include small and medium-sized coke) is referred to as charging.
  • one charge of raw material is charged by continuously charging one batch of coke and one batch of ore from the furnace wall side to the center side while tilting the swivel chute. It was.
  • the distribution of the mass ratio (hereinafter referred to as “O / C”) of the ore and coke in the radial direction of the raw material deposited in the furnace and the particle size distribution are controlled along with the operation of the blowing conditions from the tuyere. Operation is performed. Since the average particle size of the coke charged in the furnace is larger than that of the ore, the O / C distribution and the particle size distribution of the ore and coke in the furnace radial direction are controlled (that is, the distribution of the charge is manipulated). Thus, the gas flow distribution from the lower part of the furnace to the upper part of the furnace can be controlled.
  • the furnace wall from the furnace middle part (the part between the area near the center and the area near the furnace wall in the furnace) that accounts for a large proportion of the cross-sectional area of the furnace port It is preferable to maintain the O / C at the high side.
  • FIG. 1 shows a deposition state 5 of one charge of raw material in which coke and ore are divided into two batches and a total of four batches are charged.
  • a first batch of coke (hereinafter referred to as “first charging batch”) 5a is charged from the furnace wall portion to the middle portion, and the thickness of the first charging batch 5a is greater in the vicinity of the center of the furnace.
  • the second batch of coke (hereinafter referred to as “second charging batch”) 5b is charged so as to increase.
  • a first batch of ore (hereinafter referred to as “third charging batch”) 5c is charged from the furnace wall to the middle of the furnace.
  • a second batch of ore (hereinafter referred to as “fourth charging batch”) 5d is charged.
  • the O / C at the center of the furnace is The gas flow is stably secured by being kept at a low level, and the O / C from the furnace middle part to the furnace wall side is kept at a high level, thereby improving the reaction efficiency of the whole furnace.
  • the ore batch is mixed with so-called small and medium-sized coke having a particle size smaller than that of the coke charged in the coke batch. This is because it can be expected that the reaction is promoted by the close arrangement of the ore and the coke, and that the coke plays a role as an aggregate (spacer) when the ore is softened and fused.
  • the lower limit of the particle size of the small and medium-sized coke is about 5 mm, and the upper limit is about 35 to 40 mm, although it depends on the coke particle size charged in the coke batch.
  • a charge distribution operation for controlling the O / C on the furnace wall side relatively low is directed.
  • the gas flow on the furnace wall side is strengthened and the heat level is maintained at a high level, so that the formation of deposits can be suppressed.
  • Patent Document 1 a new ancillary facility is installed by charging a small coke on an ore layer in the range of 500 mm from the furnace wall, preferably as a mixture with a fine sintered ore having a particle size of 1 to 5 mm. It is possible to control O / C near the furnace wall without the need. However, it is difficult to stably deposit small coke on a terrace in a range of 500 mm from the furnace wall.
  • Patent Document 2 it is possible to independently control the O / C in the vicinity of the furnace wall by charging the raw material with the cylindrical member installed along the outer periphery of the furnace port.
  • the control range is fixed depending on the installation position of the cylindrical member, the degree of freedom in operation is small.
  • Patent Document 3 a raw material charging system different from the normal route and an auxiliary bunker are installed, and the coke is discharged from the auxiliary bunker in accordance with the ore discharge from the normal bunker, so that the O / C in the vicinity of the furnace wall is independent. Control is possible. However, in this method, since it is necessary to control the ore discharge from the bunker and the coke discharge from the auxiliary bunker according to the tilt position of the turning chute, the control becomes complicated.
  • JP-A-8-239705 Japanese Patent Laid-Open No. 2005-314771 JP 2009-62576 A
  • Patent Documents 2 and 3 since it is necessary to install a new incidental facility in a normal bellless charging device, it is disadvantageous in terms of installation cost and maintenance cost. A charging method that does not require any additional facilities is desirable.
  • the range of 500 mm from the furnace wall is defined as the charging range of the small coke, but the relative size of the small coke in the in-furnace radial direction is determined by the furnace port radius.
  • the position changes.
  • the width of the raw material flow generally charged through the swivel chute is often 500 mm or more at the stock level, and is on a terrace in the range of 500 mm from the furnace wall. It is difficult to deposit the raw material stably. Since the raw material is small coke and fine-grained sintered ore, if some raw material overflows from the terrace and flows to the center side, it may obstruct the gas flow in the center or cause fluctuations in the gas flow. .
  • This invention is made
  • the purpose is that.
  • the O / C on the central side is kept at a low level and from the middle part of the furnace where the cross-sectional area is large.
  • the reduction ratio can be reduced by maintaining the O / C on the furnace wall side at a high level.
  • an O / C near the furnace wall is used as a method for suppressing the formation of deposits or removing the deposits. It is effective to reduce.
  • the O / C near the furnace wall can be controlled independently. It is difficult and O / C falls in a wide range including the furnace middle part. Therefore, although the formation of the deposit on the furnace wall is suppressed by strengthening the gas flow on the furnace wall side, the reaction efficiency of the entire furnace is lowered, leading to a significant increase in the reducing material ratio.
  • the present inventors have made various studies on the raw material charging method of the bell-less blast furnace that can control and reduce the O / C in the vicinity of the furnace wall independently.
  • the raw material is charged from the chute to form a raw material deposition layer with an apex in the middle of the furnace, and the segregation effect due to the raw material slope from the apex (hereinafter referred to as “deposition apex”) to the furnace wall
  • deposition apex the present inventors have found a raw material charging method that can independently control only the O / C in the vicinity of the furnace wall without requiring any additional incidental equipment.
  • the present invention has been made on the basis of such examination results, and the gist thereof is the following raw material charging method to the bell-less blast furnace. That is, a raw material charging method into a bell-less blast furnace in which a coke layer and an ore layer are alternately deposited, and the raw material charging from the middle part of the furnace to the furnace wall is performed with coke batch, ore and coke. The mixture batch and the ore batch are charged in this order, The coke batch is deposited such that the coke surface has a deposition apex in the range of dimensionless furnace port radius 0.6 to 0.8, and forms a raw material deposition slope inclined from the deposition apex to the furnace center and the furnace wall.
  • the mixture batch of ore and coke is charged with the charging drop point as the furnace wall side from the top of the coke deposition
  • the ore batch is a raw material charging method into a bell-less blast furnace characterized by charging the dropping point with a dimensionless furnace port radius in the range of 0.5 to 0.9.
  • the “dimensionless furnace port radius” is an index representing the position of the raw material charging surface (raw material stock level) with respect to the furnace center, and the distance from the furnace center to the position is divided by the furnace port radius. It is an index standardized by.
  • the furnace center is represented by 0 and the furnace wall is represented by 1.
  • the “furnace intermediate part” herein refers to a range of dimensionless furnace port radius of 0.5 to 0.8.
  • the charging amount of the mixture batch of ore and coke is made smaller than that of the ore batch, and the charging drop point of the mixture batch of ore and coke is set. It is desirable to adopt an embodiment in which charging is performed in a range of a dimensionless furnace port radius of 0.9 or less on the furnace wall side with respect to the deposition apex formed by charging the coke batch.
  • the O / C only in the vicinity of the furnace wall can be independently controlled and reduced without requiring any additional incidental equipment.
  • the gas flow by the side of a furnace wall can be strengthened, formation of furnace wall deposits can be suppressed or deposits can be removed.
  • the ratio of reducing material in the blast furnace is not significantly increased, it is possible to suppress a decrease in productivity, an increase in pig iron production cost, and an increase in CO 2 emissions.
  • FIG. 1 is a schematic diagram showing an apparatus configuration at the top of a bell-less blast furnace and a raw material deposition state in the blast furnace.
  • 2A and 2B are diagrams showing calculation results of a raw material deposition profile using a simulation model.
  • FIG. 2A is a comparative example, and FIG. 2B is an example of the present invention.
  • FIG. 3 is a diagram showing a calculation result by a simulation model of the O / C distribution in the furnace radial direction.
  • FIG. 4 is a diagram showing a calculation result by a simulation model of the distribution in the furnace of ore and coke in the ore batch by the raw material charging method of the present invention.
  • FIG. 1 is a schematic diagram showing an apparatus configuration at the top of a bell-less blast furnace and a raw material deposition state in the blast furnace.
  • 2A and 2B are diagrams showing calculation results of a raw material deposition profile using a simulation model.
  • FIG. 2A is a comparative example
  • FIG. 2B is
  • FIG. 5 is a diagram showing a raw material deposition profile in a model experiment, where (a) is a comparative example and (b) is an example of the present invention.
  • FIG. 6 is a diagram showing the O / C distribution in the furnace radial direction in the model experiment.
  • the raw material charging method of the present invention is based on the raw material charging method in which the coke layer and the ore layer normally deposited in the bell-less blast furnace are alternately deposited.
  • the raw material charging from the middle part of the furnace to the furnace wall is intended to pay attention to the raw material charging in the furnace inner region excluding the center of the furnace or the middle part of the furnace.
  • the coke is charged as a first charging batch 5a from the furnace wall portion to the middle portion, and then charged as a second charging batch 5b in the vicinity of the center of the furnace, as in the conventional case (see FIG. 1). )be able to.
  • a coke batch is charged, and when the coke charging is completed, the coke layer surface has a deposition apex in the range of dimensionless furnace port radius 0.6 to 0.8, and from the deposition apex to the furnace center and the furnace wall.
  • the coke layer is deposited so as to form an inclined raw material deposition (coke layer) slope.
  • the batch of the mixture is charged such that the charging and dropping point of the mixture batch of ore and coke is set to the furnace wall side from the deposition top of the coke layer.
  • the coke layer surface has a deposition vertex in the range of the predetermined dimensionless furnace port radius, and the coke layer is deposited so as to form a raw material deposition slope inclined from the deposition vertex to the furnace center.
  • the reason why the slope inclined from the top of the deposition to the furnace wall is formed is to deposit particles having a large particle size in the vicinity of the furnace wall by utilizing the particle size segregation phenomenon on the slope.
  • the deposition vertex of the coke layer is formed in a range of dimensionless furnace port radius of 0.6 to 0.8.
  • a small batch of coke is mixed in a mixture batch of ore and coke.
  • the particle size and density are different, ore and coke are separated, and coke having a large particle size and low density with respect to the ore is deposited near the furnace wall. Thereby, O / C of the furnace wall vicinity can be reduced.
  • the charging position of the mixture batch of ore and coke on the coke slope is important. This charging position is on the furnace wall side with respect to the deposition top of the coke layer. However, if the charging position is too close to the furnace wall, the segregation effect cannot be enjoyed and the O / C in the vicinity of the furnace wall cannot be reduced. A range of 9 or less is desirable.
  • the ore batch is charged with the swivel chute being tilted from the furnace wall side to the center side, with the charging and falling point being in the range of dimensionless furnace port radius of 0.5 to 0.9. Since the charge of the mixture batch of ore and coke deposited on the furnace wall side becomes a barrier to the deposition on the furnace wall side of the ore batch, the O / C near the furnace wall does not increase extremely, Kept low.
  • the charging amount of the ore and coke mixture batch is made smaller than that of the ore batch, and the charging and dropping point of the ore and coke mixture batch is set after the completion of coke charging. It is desirable to adopt an embodiment in which charging is performed within a range of a dimensionless furnace port radius of 0.9 or less on the furnace wall side from the apex.
  • the charging amount of the ore and coke mixture batch is set to be smaller than that of the ore batch so that the raw material charged in the ore and coke mixture batch does not flow from the top of the coke layer into the furnace center. It is to do.
  • Charging a mixture batch of ore and coke facilitates the reaction by contacting the ore and coke as grains rather than as a layer (ie, placing the ore and coke close together) This is because the gas flow on the furnace wall side is strengthened by functioning as an aggregate (spacer), and the formation of furnace wall deposits is more effectively suppressed.
  • the above-mentioned effects are the same regardless of whether the coke mixed with the ore in the mixture of ore and coke is a small medium coke or a large coke (particle size coke charged in a normal coke batch). Is obtained.
  • O / C in the vicinity of the furnace wall can be controlled by adjusting the amount of coke, thus ensuring operational flexibility.
  • the ore and coke mixture batch charging drop point is closer to the furnace wall than the top of the deposit after completion of coke charging and the dimensionless furnace port radius is 0.9 or less. This is because if the batch interior position of the mixture batch with coke is too close to the furnace wall, the segregation effect on the coke slope cannot be obtained, and ore accumulates with the coke near the furnace wall, increasing O / C. .
  • the O / C in the vicinity of the furnace wall is independently controlled and reduced without requiring the installation of new equipment and the maintenance cost associated therewith. be able to.
  • the gas flow on the furnace wall side can be strengthened to suppress the formation of the furnace wall deposits or to remove the deposits.
  • the reduction ratio of the blast furnace is not significantly increased, the productivity is lowered, the pig iron manufacturing cost is increased, and the CO 2 emission amount is reduced. Can be suppressed.
  • Example 1 [Load distribution simulation]
  • the target blast furnace was a bell-less blast furnace with a furnace capacity of 5,370 m 3 , and one charge was composed of two batches of coke and two batches of ore based on the actual charge of the actual furnace.
  • the total charge per charge was 25.7 tons for the coke batch and 140.7 tons for the ore batch including coke 4.1 ton (particle size 6 to 50 mm).
  • One of the two batches of coke corresponds to a coke batch charged from the furnace intermediate part to the furnace wall ("first charge batch 5a" in FIG. 2 described below, hereinafter referred to as this term). .
  • the two batches of ore are a mixture batch of the ore and coke (hereinafter referred to as “third charging batch 5c”) and an ore batch (hereinafter referred to as “fourth charging batch 5d”). is there.
  • the mass ratio of the third charging batch 5c and the fourth charging batch 5d was 10:90.
  • FIG. 2 is a diagram showing a calculation result by a simulation model of a material deposition profile.
  • A is a comparative example, when raw material charging is performed by normal operation
  • (b) is an example of the present invention, and is a case where raw material charging is performed by the method of the present invention.
  • one charge ie, first and second charge batches 5a, 5b of coke, and third and fourth charge batches 5c, 5d of ore; third charge batch 5c contains coke).
  • the raw material deposition profile is shown.
  • the O / C at the center part is kept low.
  • the O / C from the furnace middle part to the furnace wall side is maintained at a high level.
  • the coke layer (first charging batch 5a) formed before ore charging has a deposition apex 6 at a dimensionless furnace port radius 0.7.
  • the coke layer was deposited so as to form a raw material slope inclined from the deposition apex to the furnace center and the furnace wall.
  • the raw material of the third charging batch 5c charged after formation of the coke layer is a mixture of ore and coke, and the raw material supplied from the swirl chute is coke from the viewpoint of preventing the raw material of the batch from flowing into the center.
  • the tilt angle of the swivel chute was adjusted so as to be inserted at a dimensionless radius of 0.9 on the furnace wall side of the layer deposition apex.
  • the fourth charging batch 5d to be charged has a charging drop point in the range of a dimensionless furnace port radius of about 0.6 to 0.8, while tilting the swivel chute from the furnace wall side to the middle of the furnace. I entered.
  • the raw material of the third charging batch 5c deposited on the furnace wall side becomes a barrier against the deposition of the raw material of the fourth charging batch 5d on the furnace wall side, so the O / C in the vicinity of the furnace wall is kept low. .
  • FIG. 3 is a diagram showing a calculation result by a simulation model of the O / C distribution in the furnace radial direction, and the O / C at the top of the blast furnace by the raw material charging method (comparative example) in the normal operation shown in FIG.
  • FIG. 3 is a diagram comparing the radial distribution of the O / C and the radial distribution of O / C by the raw material charging method of the present invention shown in FIG. 2 (b). From FIG. 3, in the raw material charging method according to the present invention in which the deposition apex position of the coke layer is a dimensionless furnace port radius 0.7, and the raw material charging position of the third charging batch is the dimensionless furnace port radius 0.9. Compared to the raw material charging method in normal operation, the O / C in the vicinity of the furnace wall decreases without significant change from the furnace center to the middle part of the furnace, and the desired O / C distribution state It can be seen that
  • FIG. 4 illustrates a raw material charging method of the present invention in which the deposition apex position of the coke layer is a dimensionless furnace port radius 0.7 and the furnace interior charging position of the third charging batch is a dimensionless furnace port radius 0.9. It is a figure which shows the calculation result by the simulation model of the distribution in the furnace of the said ore and coke of the said batch. From this figure, it can be seen that a large amount of coke accumulates near the furnace wall due to particle size segregation on the coke slope.
  • Example 2 [Bellless insertion model experiment] The effect of the raw material charging method of the present invention was verified using a bell-less charging model device having a scale of 1 / 5.6 of a furnace volume of 5,370 m 3 .
  • the particle size of the raw material used in the experiment was approximately 5.6 times the actual furnace size, and the charge amount per charge was the sum of coke batches (first and second charge batches) according to a similar rule. 146 kg, the ore batch (third and fourth charging batch) was made 801 kg in total including 23 kg of coke (particle size 1 to 10 mm). In the embodiment of the present invention, the mass ratio of the third charging batch and the fourth charging batch was 10:90.
  • the deposition apex position of the coke layer is set to a dimensionless furnace port radius of 0.7, and the charging of the third charging batch is performed.
  • the entry position was a dimensionless furnace port radius of 0.9.
  • FIG. 5 is a diagram showing a material deposition profile in a model experiment.
  • A is a comparative example, when raw material charging is performed by normal operation
  • (b) is an example of the present invention, and is a case where raw material charging is performed by the method of the present invention.
  • the raw material deposition profile in the furnace was continuously measured using a laser distance meter.
  • FIG. 5 shows a one-charge material deposition profile.
  • FIG. 6 is a diagram showing the O / C distribution in the furnace radial direction in the model experiment.
  • the O / C radius at the top of the blast furnace by the raw material charging method (comparative example) in the normal operation shown in FIG. It is the figure which compared directional distribution and radial direction distribution of O / C by the raw material charging method of this invention shown to (b).
  • FIG. 6 similarly to the calculation result by the simulation model (see FIG. 3), when the raw material charging method is performed by the raw material charging method of the present invention, compared to the raw material charging method in normal operation, It can be seen that the O / C in the vicinity of the furnace wall is lowered without a large change in the O / C in the middle of the furnace from the furnace center.
  • the O / C only in the vicinity of the furnace wall can be controlled and lowered independently. Moreover, since formation of furnace wall deposits can be prevented without significantly increasing the reducing material ratio of the blast furnace, it is possible to suppress a decrease in productivity, an increase in pig iron manufacturing cost, and the like. Therefore, the present invention can be effectively used when charging the raw material into the bell-less blast furnace.
  • 1 turning chute
  • 1a central axis of turning chute
  • 2 blast furnace
  • 2a central axis of blast furnace
  • 3 Raw material stock level
  • 4 Furnace port radius
  • 5a first charging batch
  • 5b second charging batch
  • 5c third charging batch
  • 5d 4th charging batch
  • 6 Coke layer deposition apex

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PCT/JP2013/001857 2012-05-28 2013-03-19 ベルレス高炉への原料装入方法 Ceased WO2013179541A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP13797875.5A EP2857529A4 (en) 2012-05-28 2013-03-19 METHOD OF LOADING RAW MATERIAL IN A BELLOW HIGH OVEN
JP2014518235A JP5696814B2 (ja) 2012-05-28 2013-03-19 ベルレス高炉への原料装入方法
CN201380028508.6A CN104364397B (zh) 2012-05-28 2013-03-19 无料钟高炉的原料装入方法
IN10251DEN2014 IN2014DN10251A (enExample) 2012-05-28 2013-03-19
KR1020147034414A KR101579031B1 (ko) 2012-05-28 2013-03-19 벨레스 고로에 대한 원료 장입 방법

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JP2012-120631 2012-05-28

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JP2015183246A (ja) * 2014-03-25 2015-10-22 新日鐵住金株式会社 ベルレス高炉の装入物装入方法
JP2017095761A (ja) * 2015-11-24 2017-06-01 Ｊｆｅスチール株式会社 高炉における装入物分布制御方法
JP2018070953A (ja) * 2016-10-29 2018-05-10 Ｊｆｅスチール株式会社 高炉への原料装入方法
JP2018070954A (ja) * 2016-10-29 2018-05-10 Ｊｆｅスチール株式会社 高炉への原料装入方法
JP2019143182A (ja) * 2018-02-19 2019-08-29 日本製鉄株式会社 高炉への原料装入方法
JP2019143225A (ja) * 2018-02-23 2019-08-29 日本製鉄株式会社 高炉原料の装入方法
CN115418422A (zh) * 2022-09-15 2022-12-02 包头钢铁（集团）有限责任公司 一种降低高炉布料偏析的优化方法
JP2023057594A (ja) * 2021-10-12 2023-04-24 日本製鉄株式会社 高炉の操業方法、装入方法制御装置及び装入方法制御プログラム

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CN108350513B (zh) * 2015-10-28 2020-05-22 杰富意钢铁株式会社 向高炉装入原料的方法
KR102763925B1 (ko) * 2020-01-29 2025-02-05 제이에프이 스틸 가부시키가이샤 고로에의 원료 장입 방법

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JP7003725B2 (ja) 2018-02-23 2022-01-21 日本製鉄株式会社 高炉原料の装入方法
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KR20150009575A (ko) 2015-01-26
KR101579031B1 (ko) 2015-12-18
JPWO2013179541A1 (ja) 2016-01-18
CN104364397B (zh) 2016-08-17
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