EP2851435B1 - Procédé de chargement d'une matière première dans un haut-fourneau - Google Patents

Procédé de chargement d'une matière première dans un haut-fourneau Download PDF

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Publication number
EP2851435B1
EP2851435B1 EP13790679.8A EP13790679A EP2851435B1 EP 2851435 B1 EP2851435 B1 EP 2851435B1 EP 13790679 A EP13790679 A EP 13790679A EP 2851435 B1 EP2851435 B1 EP 2851435B1
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European Patent Office
Prior art keywords
coke
blast furnace
furnace
ore
layer
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EP13790679.8A
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German (de)
English (en)
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EP2851435A4 (fr
EP2851435A1 (fr
Inventor
Shiro Watakabe
Jun Ishii
Toshiyuki HIROSAWA
Kazuhira ICHIKAWA
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JFE Steel Corp
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JFE Steel Corp
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    • 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
    • C21B5/001—Injecting additional fuel or reducing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/006—Automatically controlling the process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/007—Conditions of the cokes or characterised by the cokes used
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • 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

Definitions

  • the present invention relates to a method for charging starting material (blast furnace raw material) into a blast furnace by charging blast furnace raw material into the furnace with a rotating chute.
  • ore material such as sintered ore, pellet, lump ore, and the like and coke are charged into a blast furnace from the furnace top in a layer state, and combustion gas is injected through a tuyere to yield pig iron.
  • the coke and ore material that constitute the blast furnace raw material charged into the blast furnace descend from the furnace top to the furnace bottom, the ore reduces, and the temperature of the raw material rises.
  • the ore material layer gradually deforms due to the temperature rise and the load from above while filling the voids between ore materials, and at the bottom of the shaft of the blast furnace, gas permeability resistance grows extremely large, forming a cohesive layer where nearly no gas flows.
  • blast furnace raw material is charged into a blast furnace by alternately charging ore material and coke.
  • ore material layers and coke layers form alternately.
  • cohesive zone ore material layers with a large gas permeability resistance, where ore has softened and cohered, exist along with a coke slit, derived from coke, with a relatively small gas permeability resistance.
  • the gas permeability of the cohesive zone greatly affects the gas permeability of the blast furnace as a whole and limits the rate of productivity in the blast furnace.
  • the amount of coke that is used is reduced, which is considered to cause significant thinning of the coke slit.
  • JP H3-211210 A discloses charging, in a bell-less blast furnace, coke into an ore hopper that is downstream among the ore hoppers, layering coke onto the ore on a conveyor, and charging the ore and coke into the furnace top bunker and then into the blast furnace via a rotating chute.
  • JP 2004-107794 A discloses separately storing ore and coke in furnace top bunkers and mixing the coke and ore while charging them simultaneously in order to yield three batches at the same time: a batch for regularly charged coke, a batch for mainly charging coke, and a batch for mixed charging.
  • JP S59-10402 B2 discloses a method for charging blast furnace raw material into a blast furnace whereby all of the ore and all of the coke are charged into the furnace after being completely mixed.
  • EP 1 445 334 A1 discloses a method for charging a material in a bell-less blast furnace having a bell-less charging device equipped with furnace top bunkers using a rotating chute, comprising the steps of: storing coke in at least one of the furnace top bunkers; storing ore in at least another furnace top bunker; charging the stored coke into the blast furnace to form a coke alone layer at a center side of the furnace; charging the stored ore together with the stored coke to form a mixed layer to the outside of the coke layer, wherein the mixed layer has a predetermined thickness.
  • the center coke layer may be formed after forming a coke alone layer by charging the stored coke from the center side toward a wall part of the furnace.
  • JP 2007-051306 discloses a method for charging a raw material including coke and ore material into a blast furnace using a rotating chute, wherein the coke and the ore material are charged in turn to form layers, the method comprising forming a coke layer and then forming a mixed layer of the coke and the ore material over the coke layer, wherein the coke and the ore material is mixed in the mixed layer at a mass ratio O/C that varies in a predictable manner in the blast furnace radial direction.
  • the present invention has been developed in light of the above circumstances, and it is an object thereof to provide a method for charging blast furnace raw material into a blast furnace that can stabilize blast furnace operations and improve thermal efficiency by controlling the gas flow in the blast furnace without having to provide a coke slit therein.
  • the method according to the present invention comprises the steps as defined in the claims.
  • gas flow in a blast furnace can be controlled without a coke slit and the blast furnace can maintain good gas permeability, which allows for stabilizing blast furnace operation and improving reduction efficiency, and as a result, yielding high productivity and enabling operation with a low reducing agent ratio. This may result in reduced CO emission and contribute to tackling global environmental issues.
  • a mixed layer having a coke ratio that compensates the deviation of the coke distribution may be formed thereon to prevent deterioration of the gas flow in the blast furnace.
  • FIG. 1 schematically illustrates an embodiment of a method for charging blast furnace raw material into a blast furnace according to the present invention.
  • FIG. 1 illustrates the following: an ore material hopper 1 for storing ore material 2 composed of at least one of sintered ore, pellet, and lump ore; and a coke hopper 3 for storing coke 4. Ore material 2 and coke 4 that have been discharged from the ore material hopper 1 and from the coke hopper 3 in predetermined proportions are transported upwardly by an ore conveyor 5, then mixed and stored in a reserving hopper 6 as blast furnace raw material 7.
  • Blast furnace raw material 7 that has been discharged from the reserving hopper 6 is transported to the top of the blast furnace 10 by a charging conveyor 8, then charged via a receiving chute 11, and stored in one furnace top bunker, e.g., 12b among, e.g., three furnace top bunkers 12a to 12c. Note that the mixed material of ore material and coke is stored in the furnace top bunker 12b while adjusting the mixing amount of coke to be 30 mass% or less of a total amount of coke.
  • the mixing amount of coke is adjusted to be 30 mass% or less of the total amount of coke for the following reasons.
  • Ore material 2 and coke 4 that have been discharged from the ore material hopper 1 and the coke hopper 3 are transported on the ore conveyor 5 with the coke 4 being layered onto the ore material 2, charged into the reserving hopper 6, where the ore material 2 and the coke 4 are mixed to form mixed material.
  • the mixed material stored in the reserving hopper 6 may segregate during transport to the receiving chute 11 on the charging conveyor 8, and furthermore, during charging via the receiving chute 11 into the furnace top bunker 12b.
  • the amount of coke mixed with ore material is 30 mass% or less of the total amount of coke, coke and ore material are not significantly segregated when stored in the furnace top bunker 12b, and consequently, the mixing ratio of the mixed layer of ore material and coke formed by the rotating chute 16 may become substantially even.
  • the mixing amount of coke is more than 30 mass% of the total amount of coke, coke and ore material are more prone to segregation due to the differences in specific gravity and particle size and are largely segregated when stored in the furnace top bunker 12b, which causes regions where either one of ore material or coke alone is present.
  • the mixed material is discharged from the furnace top bunker 12b in the order of, as shown in FIG. 2 , upwards from a position near the outlet 12g close to the central shaft of the blast furnace, subsequently away from the central shaft of the blast furnace towards the outside, and finally the upper edge of the inclined sidewall 12h is discharged.
  • the specific way of charging ore material and coke into a blast furnace is described based on FIG. 3 .
  • the furnace top bunker 12b stores mixed material of ore material and coke
  • the furnace top bunker 12a stores coke alone
  • the furnace top bunker 12c stores ore material alone.
  • the following describes raw material charging using a so-called reverse tilting control scheme, where the rotating chute 16 is controlled to be tilted from the shaft central portion of the blast furnace 10 towards the furnace wall, while simultaneously rotating about the shaft center of the blast furnace 10.
  • the order for charging blast furnace raw material from the furnace top bunkers is as follows.
  • the rotating chute 16 is set to charge blast furnace raw material into the shaft central portion of the blast furnace, and by discharging only coke from the furnace top bunker 12a, into which coke alone has been charged, a central coke layer 12d is formed in the shaft central portion of the blast furnace.
  • the rotating chute 16 set to tilt in substantially vertical direction, the flow regulating gates 13 of the furnace top bunkers 12b and 12c are closed, the flow regulating gate 13 of only the furnace top bunker 12a is opened, and only the coke stored in the furnace top bunker 12a is fed to the rotating chute 16.
  • a central coke layer 12d is formed in the shaft central portion of the blast furnace, as shown in FIG. 3 .
  • coke falls at a position having a dimensionless radius of the blast furnace of 0 or more to 0.3 or less, in relation to the raw material stock line level, when 0 is the shaft central portion of the blast furnace and 1 is the furnace wall.
  • the reason is that collecting some of coke in the shaft central portion of the furnace may be effective for improving the gas permeability at the shaft central portion, and thus the gas permeability of the blast furnace as a whole.
  • the amount of coke charged to form a central coke layer is preferably approximately 5 mass% to 30 mass% of the amount of coke charged per charge.
  • the amount of coke charged into the shaft central portion is less than 5 mass%, the gas permeability around the shaft central portion improves insufficiently, and if coke is collected in the shaft central portion by more than 30 mass%, not only does the amount of coke used to form a mixed layer decrease, but also too much gas passes through the shaft central portion, leading to increased heat removal from the furnace body.
  • the amount of coke charged into the shaft central portion is 10 mass% to 20 mass%.
  • the proportion of coke in the mixed layer is preferably approximately 7 mass% to 25 mass%, more preferably approximately 10 mass% to 15 mass%, in terms of the ratio of (amount of coke / amount of ore material). If the ratio of (amount of coke / amount of ore material) deviates from the aforementioned range, in either case, the gas permeability in the mixed layer deteriorates. Note that the proportion of coke in the mixed layer is preferably about 20 % to 95 % in terms of a percentage of the total amount of coke.
  • ore material has a particle diameter of 5 mm to 35 mm, preferably 10 mm to 30 mm, and coke has a particle diameter of 10 mm to 60 mm, preferably 30 mm to 55 mm.
  • the ratio of the particle diameters is preferably approximately 1.0 to 5.5.
  • the ratio of the amount of ore material to the amount of coke in the mixed layer is adjusted as appropriate in the blast furnace radial direction so as to control the gas flow in the blast furnace, rather than adjusting the ratio of the thickness of an ore material layer to the thickness of a coke layer (L O /L C ) as done in conventional methods.
  • the following furnace top bunkers are preferably provided: the furnace top bunker 12a for storing coke, the furnace top bunker 12c for storing ore material, and the furnace top bunker 12b for storing mixed material of ore material and coke, and furthermore, the raw material discharge rate from each furnace top bunker may be changed in any desired manner by adjusting the opening position of the flow regulating gate 13 disposed at the bottom of each furnace top bunker 12. Accordingly, the opening position of each flow regulating gate 13 may be adjusted to control the discharge rate of coke and ore material, and thus change the ratio of the amount of ore material to the amount of coke in the mixed layer to be deposited in the furnace in a continuous or stepwise manner in the blast furnace radial direction.
  • a gas flow is formed in the blast furnace radial direction depending on the ratio of the gas permeability resistance in the radial direction of the packed layer and the cohesive zone in the furnace, the gas permeability resistance is determined by the particle diameter of particles constituting the layer and the void ratio among particles, and those factors of the mixed layer are mainly determined by the amount of coke mixed in the mixed layer. Therefore, the gas flow in the blast furnace radial direction may be controlled by adjusting the amount of coke contained in the mixed layer.
  • the laboratory device illustrated in FIG. 4 was used to simulate the raw material reduction and elevated temperature process in a blast furnace and to test the change in gas permeability resistance.
  • a furnace core tube 32 is disposed on the inner peripheral surface of a cylindrical furnace body 31, and a cylindrical heater 33 is disposed on the outside of the furnace core tube 32.
  • a graphite crucible 35 is disposed at the upper edge of a cylindrical body 34 constituted by refractory material, and charged raw material 36 is charged inside the crucible 35.
  • a load is applied to the charged raw material 36 from above by a load application device 38 connected via a punch rod 37, so that the charged raw material 36 adopts approximately the same state as the cohesive layer at the bottom of the blast furnace.
  • a device 39 for sampling drops is provided at the bottom of the cylindrical body 34.
  • the gas adjusted by a gas mixing device 40 is fed to the crucible 35 through the cylindrical body 34 provided on its underside, and the gas passing through the charged raw material 36 in the crucible 35 is analyzed by a gas analysis device 41.
  • a thermocouple 42 for controlling the heating temperature is provided in the heater 33, and by having a control device (not illustrated) control the heater 33 while measuring the temperature with the thermocouple 42, the crucible 35 is heated to 1200 °C to 1500 °C.
  • samples were prepared by mixing, in different proportions, coke with ore material formed from sinter and iron ore mixed in a predetermined ratio.
  • FIG. 5 is a graph showing the results of the aforementioned experiments and the relationship between the ratio of mixed coke to ore material and maximum pressure drop, using the sinter ratio as parameters. It can be seen from FIG. 5 that the maximum pressure drop becomes less significant with increasing mixed coke ratio, independently of the type of ore material. The reason seems to be that mixing with coke suppressed deformation of ore, preserved voids near the mixed coke, and accordingly prevented the occurrence of a phenomenon that would otherwise cause a decrease in the amount of voids among particles and an increase in gas permeability resistance due to deformation of ore.
  • FIG. 6 is a graph showing the results of studies conducted separately to examine the relationship between the mixed coke ratio and the gas permeability resistance ( ⁇ P/V) of the mixed coke packed layer, plotting parameters of the ratio of the particle diameter of coke to the particle diameter of sintered ore.
  • the mixed coke ratio in the blast furnace radial direction may be appropriately controlled to be a predetermined value, with the result that the gas flow in the blast furnace may be controlled as appropriate.
  • the ratio of mixed coke to ore material as well as the ratio of the particle diameter of coke to the particle diameter of sintered ore
  • the mixed coke ratio in the blast furnace radial direction may be appropriately controlled to be a predetermined value, with the result that the gas flow in the blast furnace may be controlled as appropriate.
  • a mixed layer having a coke ratio that compensates the deviation of the coke distribution may be formed thereon to prevent deterioration of the gas flow in the blast furnace.
  • FIG. 7 is a graph showing an example where the mixed coke ratio varies in the blast furnace radial direction, with varying raw material discharge rates over time for discharge from the furnace top bunker 12a for storing coke and for discharge from the furnace top bunker 12c for storing ore material, according to the present invention.
  • to form a central coke layer 12d only coke is charged at a discharge rate of 0.10 t/s into a region having a dimensionless radius of the blast furnace in a range of 0 to 0.4.
  • ore material is charged at a constant discharge rate of 1.75 t/s, while coke is charged at a discharge rate of 0.08 t/s into a region having a dimensionless radius of the blast furnace in a range of 0.4 to 0.7, and subsequently at a raised discharge rate of 0.12 t/s into a region having a dimensionless radius of the blast furnace in a range of 0.7 to 1.0.
  • the method For raw material charging into the blast furnace, the method involves sequentially forming layers, each of which consists of the above-described central coke layer 12d and mixed layer 12e, inside the blast furnace 10 from the bottom to the top. In this way, a layer consisting of the central coke layer 12d and the mixed layer 12e is stacked to form multiple layers, whereby the central coke layers 12d with small gas permeability resistance are formed from the bottom of the blast furnace towards the top of the blast furnace at the shaft central portion inside the blast furnace 10, and the mixed layers 12e in which coke and ore material are completely mixed are formed on the outside thereof.
  • the ore material at the bottom of the blast furnace 10 dissolves, with the result that the coke and ore material charged into the blast furnace 10 descend from the furnace top to the furnace bottom, and the ore material is reduced and rises in temperature. Therefore, at the top of the melt layer, a cohesive zone in which the ore material is softened forms, and the ore material is reduced at the top of this cohesive zone. At this time, at the bottom of the blast furnace 10 in the mixed layer 12e, the ore material and the coke are completely mixed, with coke penetrating between the ore materials.
  • the gas permeability improves by virtue of the absence of a coke slit, and high-temperature gas passes directly between ore materials, allowing for improvement of heat-transfer properties without delay in heat transfer.
  • charging layers are stacked by forming central coke layers 12d, into which coke alone has been charged, and mixed layers 12e, in which coke and ore material are completely mixed. Therefore, no coke slit is formed in the mixed layers 12e.
  • gas flow in the blast furnace radial direction can be precisely controlled. Therefore, gas flow in the blast furnace becomes uniform and good thermal conductivity can also be ensured, as can stable improvement in gas permeability, thus resolving the problems in the above conventional example.
  • FIG. 7 shows a case where the discharge rate of coke is switched in one step, yet the discharge rate may be switched in more than one step, and even changed in a continuous manner.
  • the following describes a case where the discharge rate is switched in two steps. In this case, only coke is charged at a discharge rate of 0.10 t/s into those regions with a dimensionless radius of the blast furnace from 0 to 0.4 to form a central coke layer.
  • ore material may be charged at a constant discharge rate of 1.75 t/s, while coke may be charged at a discharge rate of 0.2 t/s into a region having a blast furnace dimensionless radius from 0.4 to 0.6, at a discharge rate of 0.17 t/s into a region having a blast furnace dimensionless radius from 0.6 to 0.8, and at a discharge rate of 0.15 t/s into a region having a blast furnace dimensionless radius from 0.8 to 1.0.
  • an advantageous operation is as follows: when a shaft pressure anomaly is detected while monitoring shaft pressure during blast furnace operation, in the course of continuous blast furnace charging according to the present invention, the raw material charging should be switched to a normal mode in which ore material layers and a coke slit are separately formed and, when the shaft pressure anomaly is resolved later, switched back to the charging scheme according to the present invention.
  • coke mixing ratio is the amount of coke mixed in the mixed layer 12e, based on the total amount of coke, and productivity is the amount of metal produced per day in the blast furnace (t/d) divided by the volume of the blast furnace (m 3 ).
  • Example 1 has a coke mixing ratio of 40 mass% and productivity of 2.2
  • Example 2 has a coke mixing ratio of 69 mass% and productivity of 2.2
  • Example 3 has a coke mixing ratio of 84 mass% and productivity of 2.2
  • Example 4 has a coke mixing ratio of 84 mass% and productivity of 2.6.
  • Comparative Example 1 has a coke mixing ratio of 0 mass% and productivity of 2.2
  • Comparative Example 2 has a coke mixing ratio of 32 mass% and productivity of 2.2
  • Comparative Example 3 has a coke mixing ratio of 32 mass% and productivity of 2.6
  • Comparative Example 4 has a coke mixing ratio of 84 mass% and productivity of 2.6.
  • the coke ratio and the pulverized coal ratio are the coke volume and pulverized coal volume (kg) used when producing It of hot metal.
  • the reducing agent ratio is the sum of the coke ratio and the pulverized coal ratio.
  • Examples 1 to 4 each yielded a significant drop in the reducing agent ratio, which is the sum of the coke ratio and the pulverized coal ratio, and an improvement in gas utilization rate, as compared ) with Comparative Examples 1 to 4. Moreover, Examples 1 to 4 each showed a drastic reduction in ⁇ P/V, which is an index of gas permeability resistance, and offered considerably improved gas permeability in the blast furnace.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)

Claims (2)

  1. Procédé de chargement de matière première de haut fourneau dans un haut fourneau (10), le procédé comprenant le chargement de matière première de haut fourneau (7) incluant du coke (4) et une matière de minerai (2) dans le haut fourneau (10) à l'aide d'un couloir rotatif (16), caractérisé en ce que le procédé comprend en outre :
    la formation séquentielle de couches à l'intérieur du haut fourneau (10) de bas en haut, dont chacune est constituée d'une couche de coke centrale (12d) et d'une couche mixte (12e) du coke (4) et de la matière de minerai (2), dans lequel la couche de coke centrale (12d) est formée au niveau d'une portion centrale de cheminée du haut fourneau et la couche mixte (12e) est formée sur l'extérieur de la couche de coke centrale (12d) avec un rapport de mélange de coke variant par palier dans la direction radiale de haut fourneau.
  2. Procédé de chargement de matière première de haut fourneau dans un haut fourneau selon la revendication 1, comprenant en outre :
    la fourniture d'au moins deux accumulateurs hauts de fourneau (12a, 12b, 12c) au niveau d'une partie haute du haut fourneau (10) ;
    le stockage, dans l'un ou l'autre ou dans les deux accumulateurs hauts de fourneau, de l'une ou l'autre ou les deux de la matière de minerai (2) et de la matière mixte obtenue en mélangeant la matière de minerai (2) avec le coke (4) avec une quantité de mélange de coke qui est de 30 % en masse ou moins d'une quantité totale du coke (4) ;
    le stockage uniquement du coke (4) dans l'un des accumulateurs hauts de fourneau restants ;
    la réception de la matière première évacuée depuis chacun des accumulateurs hauts de fourneau dans une trémie de collecte (14) ; et
    ensuite l'apport de la matière première dans le couloir rotatif (16) pour charger la matière première de haut fourneau (7) dans le haut fourneau (10), dans lequel
    (1) le couloir rotatif est réglé pour charger la matière première de haut fourneau dans la portion centrale de cheminée du haut fourneau, et en évacuant uniquement le coke (4) depuis l'accumulateur haut de fourneau (12a), dans lequel uniquement le coke (4) a été chargé, la couche de coke centrale (12d) est formée dans la portion centrale de cheminée du haut fourneau, et
    (2) le couloir rotatif est ensuite réglé pour charger la matière première de haut fourneau à l'extérieur de la couche de coke centrale (12d), et en évacuant simultanément le coke (4) et la matière de minerai (2) et/ou la matière mixte depuis les accumulateurs hauts de fourneau (12b, 12c) à une vitesse d'évacuation ajustée, en mélangeant le coke évacué avec la matière de minerai évacuée et/ou la matière mixte dans la trémie de collecte pour former un mélange, et en apportant le mélange dans le couloir rotatif, la couche mixte (12e) est formée sur l'extérieur de la couche de coke centrale (12d).
EP13790679.8A 2012-05-18 2013-05-17 Procédé de chargement d'une matière première dans un haut-fourneau Active EP2851435B1 (fr)

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JP2012114866 2012-05-18
PCT/JP2013/003171 WO2013172045A1 (fr) 2012-05-18 2013-05-17 Procédé de chargement d'une matière première dans un fourneau

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EP2851435A1 EP2851435A1 (fr) 2015-03-25
EP2851435A4 EP2851435A4 (fr) 2015-12-30
EP2851435B1 true EP2851435B1 (fr) 2019-07-31

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BR112016022237B1 (pt) * 2014-03-28 2021-02-09 Jfe Steel Corporation método para carregar matéria-prima em alto-forno
WO2016051773A1 (fr) * 2014-09-29 2016-04-07 Ｊｆｅスチール株式会社 Procédé de chargement d'une matière première dans un haut fourneau
RU2742997C1 (ru) 2018-03-30 2021-02-12 ДжФЕ СТИЛ КОРПОРЕЙШН Способ загрузки исходных материалов в доменную печь
JP6558518B1 (ja) 2018-03-30 2019-08-14 Ｊｆｅスチール株式会社 高炉の原料装入方法
JP7545494B2 (ja) * 2020-12-23 2024-09-04 株式会社Ｉｈｉポールワース 炉頂装置

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KR20150004879A (ko) 2015-01-13
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WO2013172045A1 (fr) 2013-11-21
EP2851435A4 (fr) 2015-12-30
EP2851435A1 (fr) 2015-03-25

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