WO2021152989A1 - Procédé pour charger une matière première dans un haut-fourneau - Google Patents

Procédé pour charger une matière première dans un haut-fourneau Download PDF

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WO2021152989A1
WO2021152989A1 PCT/JP2020/044357 JP2020044357W WO2021152989A1 WO 2021152989 A1 WO2021152989 A1 WO 2021152989A1 JP 2020044357 W JP2020044357 W JP 2020044357W WO 2021152989 A1 WO2021152989 A1 WO 2021152989A1
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Prior art keywords
ore
mixed
coke
coarse
furnace
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PCT/JP2020/044357
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English (en)
Japanese (ja)
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和平 市川
佐藤　健
山本　哲也
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Ｊｆｅスチール株式会社
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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 CN202080094945.8A priority Critical patent/CN115023508B/zh
Priority to JP2021508006A priority patent/JP6885528B1/ja
Priority to KR1020227026245A priority patent/KR20220119154A/ko
Priority to BR112022014972A priority patent/BR112022014972A2/pt
Priority to EP20916867.3A priority patent/EP4083235A4/fr
Publication of WO2021152989A1 publication Critical patent/WO2021152989A1/fr

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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

Definitions

  • the present invention relates to a method of charging raw materials into a blast furnace.
  • the ore and coke which are the raw materials, are alternately charged from the top of the furnace in predetermined amounts, and the ore layer and the coke layer are alternately laminated in the furnace.
  • This layer of ore and coke is called one charge of ore and coke, respectively.
  • the gas flow in the furnace is controlled by controlling the layer thickness ratio of the ore layer and the coke layer in the furnace in the furnace radial direction.
  • the charging chute is tilted during charging of raw materials in order to realize stable blast furnace operation and form a layer thickness ratio distribution that can reduce the reducing agent ratio. The corners are changed as appropriate.
  • the ore and coke of each charge are charged in batches a plurality of times.
  • Non-Patent Document 1 discloses that the ratio of reducing agent in blast furnace operation can be reduced by mixing 50 kg / t-pi small coke in the ore layer.
  • Patent Document 1 states that the first batch when the ore layer is divided into two batches is a mixture of ore and coke, and the first half of the mixture is a charging chute as a furnace wall.
  • a method is disclosed in which a forward tilting charge is used in which the charge is tilted from the side to the center side of the furnace, and a reverse tilt charge is used in which the charge is tilted from the center side of the furnace to the furnace wall side in the latter half.
  • the coke mixing ratio is controlled by charging in this way, and the reducing property of the ore can be improved by this.
  • Patent Document 2 discloses a method in which small coke is mixed with ore charged in the vicinity of the center of the furnace and then charged in a forward tilted manner.
  • Non-Patent Document 2 discloses a method of classifying the sinter and charging coarse particles on the center side and fine particles on the peripheral side of the blast furnace.
  • the present invention has been made in view of such problems of the prior art, and an object of the present invention is a coarse-grained ore mixed with mixed coke that maintains high reduction reactivity while ensuring air permeability in a blast furnace. It is to provide a method of charging raw materials into a blast furnace capable of forming a layer.
  • the means for solving the above problems are as follows. (1) A method of charging raw materials into a blast furnace in which a mixture of ore and mixed coke is divided into two or more batches using a bellless charging device having a charging chute and charged into the blast furnace. It is divided into coarse-grained ore and fine-grained ore having an average particle size smaller than that of the coarse-grained ore, and mixed coke is mixed with the coarse-grained ore to obtain a coarse-grained ore in which mixed coke is mixed.
  • the mixed coke is mixed to form a fine-grained ore in which the mixed coke is mixed, and the charging chute is made from the furnace center side to the furnace wall side of the midpoint between the furnace center and the furnace wall in the radial direction of the blast furnace in at least the first batch.
  • a method for charging a raw material into a blast furnace in which all or a part of the coarse-grained ore mixed with the mixed coke is charged by tilting.
  • the charging chute is tilted from the furnace wall side to the furnace center side from the midpoint between the furnace center and the furnace wall in the radial direction of the blast furnace, and the mixed coke is mixed in the fine-grained ore.
  • the method for charging raw materials into a blast furnace according to (1), wherein all or part of the material is charged.
  • the coarse-grained ore mixed with the mixed coke is suppressed from flowing into the furnace center side, and the coke is suppressed from segregating toward the furnace center side. ..
  • a coarse-grained ore layer mixed with mixed coke that maintains high reduction reactivity while ensuring air permeability in the blast furnace is formed, and the reduction agent ratio and coke ratio in blast furnace operation can be reduced.
  • FIG. 1 is a schematic cross-sectional view of a coarse-grained ore layer 12 in which mixed coke charged by the method for charging raw materials into a blast furnace according to the present embodiment and a fine-grained ore layer 14 in which mixed coke is mixed.
  • FIG. 2 is a graph showing the relationship between the mixing amount of mixed coke mixed with the coarse-grained ore of the first batch and the reduction rate.
  • the ore is divided into coarse-grained ore and fine-grained ore in order to maintain high reducibility while ensuring air permeability in the blast furnace, and mixed coke is mixed with each of the coarse-grained ore mixed with mixed coke. Fine-grained ore mixed with mixed coke.
  • the present inventors flow into the center side of the furnace, and the difference in specific gravity and the difference in particle size between the coke and the ore. It was confirmed that the coke mixed with the coarse-grained ore was separated and segregated toward the center of the furnace.
  • the coke mixed with the ore is described as mixed coke to distinguish it from the coke used for forming the coke layer in the blast furnace.
  • the particle size of the mixed coke is in the range of 5-40 mm.
  • the ore is a sinter produced in a sintering plant, and coarse-grained ore and fine-grained ore having an average particle size smaller than that of the coarse-grained ore have a size within the range of 4 to 10 mm. It is divided by sieving the sinter using an open sieve. As the sieve, various types such as a woven net, a punch metal, and a grizzly bar, which are generally used for sieving ore, may be used. Since a large amount of ore is used in the blast furnace, it is preferable to use a grizzly bar type sieve.
  • the sinter By dividing the sinter using a sieve with a mesh size in the range of 4 to 10 mm, the sinter can be divided into coarse-grained ore and fine-grained ore at an appropriate mass ratio, and the reaction of the coarse-grained ore. It is possible to suppress the decrease in sex. If a sieve having a mesh size smaller than 4 mm is used, the amount of fine-grained ore collected becomes extremely small and most of the fine-grained ore becomes coarse-grained ore, which makes it difficult to charge the ore by particle size classification, which is not preferable. It is not preferable to use a sieve having a mesh size larger than 10 mm because the average particle size of the coarse-grained ore increases and the reactivity of the ore decreases.
  • the sintered ore is sieved with a sieve having an opening of any size within the range of 4 to 10 mm, and the sintered ore sieved on the sieve is a coarse-grained ore, which is sieved under the sieve.
  • the sieved ore is a fine-grained ore.
  • the mass ratio of coarse-grained ore to fine-grained ore changes depending on the particle size distribution of the ore and the size of the opening to be divided, but the mass ratio of coarse-grained ore to fine-grained ore is in the range of 50:50 to 90:10. It is preferable to select a sieve having a wide opening.
  • the controllability of the ore particle size in the radial direction inside the furnace is improved. do. It is more preferable that the sinter is sieved using a sieve having a mesh size of 5 to 8 mm and divided into coarse-grained ore and fine-grained ore.
  • the particle size distribution of the sinter may fluctuate depending on the operating conditions of the sinter.
  • the coarse-grained ore and the fine-grained ore are sieved by keeping the mesh size of the sieve constant so that the mass ratio of the coarse-grained ore and the fine-grained ore is approximately 50:50. Then, it may be appropriately mixed and used according to the balance between the coarse-grained ore and the fine-grained ore used in the blast furnace. That is, if the coarse-grained ore used in the blast furnace is insufficient, a part of the fine-grained ore is mixed with the coarse-grained ore. May be mixed with.
  • the ore used for forming the ore layer mixed with mixed coke is divided into coarse-grained ore and fine-grained ore by the method described above. Then, mixed coke is mixed with each of the coarse-grained ore and the fine-grained ore to prepare a coarse-grained ore mixed with the mixed coke and a coarse-grained ore mixed with the mixed coke.
  • the mixing amount of the mixed coke to be mixed with the coarse-grained ore and the fine-grained ore may be 30 kg / t-pig or more and 100 kg / t-pig or less, and 40 kg / t-pig or more and 80 kg / t-pig or less. preferable.
  • the unit kg / t-pig is the mass (kg) of the mixed coke to be mixed with respect to the mass (t) of the hot metal produced by melting and reducing each of the coarse-grained ore or the fine-grained ore in which the mixed coke is mixed. ).
  • Mixed coke and coarse-grained ore are mixed, for example, by further depositing mixed coke on a conveyor on which coarse-grained ore is deposited.
  • the coarse-grained ore mixed with mixed coke is charged into the furnace top hopper by a conveyor and charged into the blast furnace via a charging chute.
  • mixed coke and fine-grained ore are mixed by further depositing mixed coke on a conveyor on which fine-grained ore is deposited, for example.
  • the fine-grained ore mixed with mixed coke is charged into the furnace top hopper by a conveyor and charged into the blast furnace via a charging chute.
  • FIG. 1 is a schematic cross-sectional view of a coarse-grained ore layer 12 in which mixed coke charged by the method for charging raw materials into a blast furnace according to the present embodiment and a fine-grained ore layer 14 in which mixed coke is mixed. ..
  • the horizontal axis of FIG. 1 is the dimensionless furnace opening radius, which is a value obtained by dividing the distance from the furnace center by the furnace opening radius.
  • the vertical axis is the relative height from the reference height.
  • the ore mixed with mixed coke is charged into the blast furnace in two batches, and the coarse-grained ore layer 12 in which the mixed coke is mixed is formed by the charging of the first batch. By charging the batches, a fine-grained ore layer 14 in which mixed coke is mixed is formed.
  • the charging chute is tilted from the furnace center side to the furnace wall side from the midpoint between the furnace center and the furnace wall in the radial direction of the blast furnace in the first batch (hereinafter, This tilt is referred to as "reverse tilt") to charge the coarse-grained ore mixed with the mixed coke, and the coarse-grained ore layer 12 is formed on the coke layer 10.
  • the deposition surface of the coke layer 10 is inclined so that the central side of the furnace, which has a small dimensionless furnace opening radius, is low and the coke layer 10 is high toward the wall side.
  • the coarse-grained ore in which the mixed coke is mixed when the coarse-grained ore in which the mixed coke is mixed is charged by tilting the charging chute in the reverse direction, the coarse-grained ore in which the mixed coke is mixed so as to be piled up from below with respect to the inclined sedimentary surface of the coke layer 10. Since the ore is deposited, the coarse-grained ore does not spread in the radial direction of the furnace opening. As a result, the coarse-grained ore mixed with the mixed coke is suppressed from flowing into the furnace center side, and the segregation of the mixed coke toward the furnace center side is suppressed. As a result, a coarse-grained ore layer mixed with mixed coke that maintains high reduction reactivity while ensuring air permeability in the blast furnace is formed, and the ratio of reducing agents in blast furnace operation is reduced.
  • the charging chute is tilted from the furnace wall side to the furnace center side from the midpoint between the furnace center and the furnace wall (hereinafter, this tilt is referred to as "forward tilt") to mix coke.
  • this tilt is referred to as "forward tilt" to mix coke.
  • the coarse-grained ore mixed with the above is charged, the coarse-grained ore is charged so as to flow from above the inclined surface on the furnace wall side to below the inclined surface on the furnace center side.
  • the coarse-grained ore flows into the furnace center side and spreads and deposits on the furnace center side.
  • the mixed coke mixed with the coarse-grained ore is separated due to the difference in specific gravity and particle size between the mixed coke and the ore, and the mixed coke is segregated toward the center of the furnace.
  • the mixed coke segregates toward the center of the furnace the amount of mixed coke effectively mixed with the ore is reduced, so that high reduction reactivity is not maintained and the ratio of reducing agent in blast furnace operation is high.
  • FIG. 2 is a graph showing the relationship between the mixing amount of mixed coke mixed in the coarse-grained ore of the first batch and the average reduction rate up to 1300 ° C.
  • the horizontal axis of FIG. 2 is the mixing amount of mixed coke (kg / t-pig), and the vertical axis is the average reduction rate (m Cincinnatil / min) up to 1300 ° C.
  • the average reduction rate is the average reduction rate obtained when 1550 g of ore is heated from 1000 ° C. to 1300 ° C. at 5 ° C./min under each coke mixing condition and reduced with CO gas, and is removed by reduction. It is a value showing the amount of oxygen in mol.
  • FIG. 2 shows the above relationship when the charging chute is tilted in the reverse direction to charge the coarse-grained ore mixed with mixed coke.
  • the dotted line in FIG. 2 shows the above relationship when the charging chute is tilted forward to charge the coarse-grained ore mixed with mixed coke.
  • the effect of improving the reduction rate with respect to the mixed coke amount is that the charging chute is tilted in the reverse direction to charge the coarse-grained ore rather than the charging chute is tilted forward to charge the coarse-grained ore. It was higher to enter. From this result, by tilting the charging chute in the reverse direction and charging the coarse-grained ore mixed with the mixed coke of the first batch, segregation of the mixed coke toward the center of the furnace is suppressed, which results in high reduction. It was confirmed that a coarse-grained ore layer mixed with mixed coke that maintains reactivity can be formed.
  • the fine-grained ore mixed with the mixed coke is charged into the blast furnace in the second batch, which is the final batch after the charging of the coarse-grained ore.
  • the fine-grained ore layer 14 is formed on the coarse-grained ore layer 12.
  • the coarse-grained ore layer 12 is inclined so as to be gently lowered from the midpoint between the center of the furnace and the furnace wall toward the furnace wall side. Therefore, it is preferable that the fine-grained ore mixed with the mixed coke is charged into the blast furnace by tilting the charging chute forward.
  • the fine-grained ore By charging the fine-grained ore in this way, the fine-grained ore is deposited so as to be piled up from below the inclined coarse-grained ore layer 12, so that the charged coarse-grained ore does not spread in the radial direction of the furnace opening. ..
  • the fine-grained ore mixed with the mixed coke is suppressed from flowing into the furnace wall side, and the segregation of the mixed coke toward the furnace wall side is suppressed.
  • a fine-grained ore layer mixed with mixed coke that maintains high reduction reactivity is formed, and the ratio of the reducing agent can be further reduced.
  • the fine-grained ore when the second batch of fine-grained ore is charged by tilting the charging chute in the reverse direction, the fine-grained ore is loaded so as to flow from above the inclined surface on the center side of the furnace to below the inclined surface on the furnace wall side. Be entered. Therefore, the fine-grained ore spreads and accumulates on the furnace wall side.
  • the mixed coke mixed with the fine-grained ore segregates toward the furnace wall side due to the difference in specific gravity and particle size between the coke and the ore.
  • the mixed coke segregates toward the furnace wall side, the amount of mixed coke effectively mixed with the ore is reduced.
  • the high reduction reactivity at the furnace wall is not maintained as compared with the case where the second batch of fine-grained ore is charged by tilting the charging chute forward, and the ratio of the reducing agent in the blast furnace operation is relatively high. It gets higher.
  • the ore is divided into coarse-grained ore and fine-grained ore, and mixed coke is mixed with each.
  • the charging chute is tilted in the reverse direction to charge the coarse-grained ore mixed with the mixed coke into the blast furnace.
  • the ore is divided into coarse-grained ore and fine-grained ore, mixed coke is mixed with each, and the coarse-grained ore mixed with mixed coke is charged in the first batch, and the final batch is obtained.
  • An example of charging fine-grained ore mixed with mixed coke was shown in the second batch, but the present invention is not limited to this.
  • the mixture of ore and mixed coke may be divided into 3 or more batches. Even in this case, segregation of the mixed coke toward the center of the furnace is suppressed by charging all or part of the coarse-grained ore mixed with the mixed coke by reversely tilting the charging chute in at least the first batch. NS.
  • the ratio of the reducing agent in the blast furnace operation is reduced as compared with the case where the charging chute is tilted forward in the first batch and the coarse-grained ore mixed with the mixed coke is charged. Furthermore, by tilting the charging chute forward to charge the final batch with all or part of the fine-grained ore mixed with mixed coke, high reduction reactivity at the furnace wall is maintained, and reduction in blast furnace operation. The material ratio can be reduced.
  • the mixture of ore and mixed coke is divided into 3 or more batches and charged, in the ore batches other than the first batch and the final batch, even if the coarse-grained ore mixed with the mixed coke is charged, it is mixed. Fine-grained ore mixed with coke may be charged. In this batch, it is more preferable to charge coarse-grained ore mixed with mixed coke or fine-grained ore mixed with mixed coke by reverse tilting. By charging these raw materials in a reverse tilt, the flow of the mixed coke with a part of the mixed coke charged in the previous batch to the furnace center side is suppressed, so that the mixed coke segregates toward the furnace center side. Is suppressed.
  • the coarse-grained ore and fine-grained ore mixed with mixed coke were charged into the blast furnace by the method of charging the raw material into the blast furnace according to the present embodiment, and the blast furnace was operated, and the effect of reducing the reducing agent ratio and the coke ratio was confirmed.
  • the example described will be described.
  • a blast furnace equipped with a bellless charging device with a charging chute and having an internal volume of 5000 m 3 is first charged with coke to form a coke layer, and then the ore is loaded in the furnace using the bellless charging device. It entered to form an ore layer. This operation was repeated, and the coke layer and the ore layer were alternately formed in the furnace to operate the blast furnace.
  • Example 1 the ratio of the average grain size of the coarse-grained ore to the average grain size of the fine-grained ore, the tilting direction of the charging chute of the first batch, and the tilting direction of the charging chute of the second batch and the mixing of mixed coke.
  • the reducing agent ratio and coke ratio in blast furnace operation were measured with and without change and under the same other conditions.
  • the measurement conditions and measurement results of Comparative Examples 1 to 5 and Invention Examples 1 to 3 are shown in Table 1 below.
  • the mixing ratio of mixed coke is 60 kg / t-pig.
  • the sieves used to separate the coarse-grained ore and the fine-grained ore are sieves with a mesh size of 10 mm (average particle size ratio 1.85) and a mesh size of 14 mm (average particle size ratio 1.35).
  • the average particle size ratio is a value obtained by dividing the average particle size of the coarse-grained ore sieved by the above-mentioned sieve by the average particle size of the fine-grained ore.
  • the average particle size of the fine-grained ore sieved using a sieve having a mesh size of 10 mm was 8 mm, and the average particle size of the coarse-grained ore was 14.8 mm.
  • the mass ratio of this coarse-grained ore to the fine-grained ore was 66:34.
  • the average particle size of the fine-grained ore sieved using the opening of 14 mm was 12 mm, and the average particle size of the coarse-grained ore was 16.2 mm.
  • the mass ratio of this coarse-grained ore to the fine-grained ore was 58:42.
  • the average particle size of the mixed coke was 25 mm.
  • the average particle size of both ore and coke was determined by sieving using a sieve having a nominal opening of 1 mm or more specified in JISZ 8801-2019.
  • As the representative diameter of the sieved mass 0.5 mm under the sieve of 1 mm is used, and the average value of the main dimensions of each sieve and the sieve with the opening above it is used for the others, and the sieve is sieved with respect to the representative diameter.
  • the average particle size was obtained by weighted averaging the obtained mass.
  • “O1 tilting direction” in Table 1 indicates the tilting direction of the ore charging chute charged in the first batch.
  • the “O2 tilting direction” indicates the tilting direction of the ore charging chute charged in the second batch.
  • coarse-grained ore was charged in the first batch, and fine-grained ore was charged in the second batch.
  • "Forward” in the tilting direction indicates that the charging chute was tilted forward to charge the ore, and "reverse” indicates that the charging chute was tilted in the reverse direction to charge the ore.
  • Invention Example 1 the ore was divided into coarse-grained ore and fine-grained ore (particle size ratio 1.35), mixed coke was mixed with these, and the coarse-grained ore was charged in the first batch by reverse tilting.
  • Invention Example 1 has a higher gas utilization rate than Comparative Example 3 in which coarse-grained ore is charged in the first batch under the same conditions by forward tilting, the pressure loss of the packed bed is reduced, and the reducing agent ratio and the reducing agent ratio are reduced. The coke ratio has been reduced.
  • Invention Example 3 the ore is divided into coarse-grained ore and fine-grained ore (particle size ratio: 1.83), mixed coke is mixed with these, and the coarse-grained ore is charged in the first batch by reverse tilting. did.
  • Invention Example 3 has a higher gas utilization rate than Comparative Example 5 in which coarse-grained ore is charged in the first batch under the same conditions by forward tilting, the pressure loss of the packed bed is reduced, and the reducing agent ratio and the reducing agent ratio are reduced. The coke ratio has been reduced.
  • the coarse-grained ore of the first batch is loaded with the reverse tilt regardless of whether the tilting direction of the fine-grained ore of the second batch is forward tilting or reverse tilting. It can be seen that the reducing agent ratio and the coke ratio can be reduced as compared with the case where the coarse-grained ore of the first batch is charged in a forward tilting manner. Based on these results, the ore was divided into coarse-grained ore and fine-grained ore, mixed coke was mixed with each, and the coarse-grained ore mixed with mixed coke was charged in the first batch by reverse tilting to blast furnace. It was confirmed that the reducing agent ratio and coke ratio in operation can be reduced.
  • Comparative Examples 2 and 4 in which the ore was divided into a coarse-grained ore and a fine-grained ore, the coarse-grained ore was charged in the first batch, and the fine-grained ore was charged in the second batch, the ore was regarded as the coarse-grained ore.
  • the reducing material ratio and the coke ratio were reduced as compared with Comparative Example 1 in which the ore was charged without being divided into fine-grained ores.
  • Comparative Examples 2 and 4 since the mixed coke was not mixed, the reduction reactivity was inferior, and therefore, the reducing agent ratio and the coke ratio were increased as compared with Comparative Examples 3 and 5.
  • Table 2 shows an example in which the same blast furnace as in Example 1 was used, the ore was charged in 3 batches, and the operation was performed under the condition of a tapping ratio of 2.0.
  • the sieving of coarse-grained ore and fine-grained ore was also set under two conditions, that is, an average particle size ratio of 1.35 and 1.85, as in Example 1.
  • the measurement conditions and measurement results of Comparative Example 11 and Invention Examples 11 to 24 are shown in Table 2 below.
  • “O1 tilting direction” in Table 2 indicates the tilting direction of the ore charging chute charged in the first batch.
  • the “O2 tilting direction” indicates the tilting direction of the ore charging chute charged in the second batch.
  • the “O3 tilting direction” indicates the tilting direction of the ore charged in the third batch, which is the final batch.
  • “Forward” in the tilting direction indicates that the charging chute was tilted forward to charge the ore, and “reverse” indicates that the charging chute was tilted in the reverse direction to charge the ore.
  • Comparative Example 11 and Invention Examples 11 and 12 the ore was divided into coarse-grained ore and fine-grained ore (particle size ratio 1.35), and mixed coke was mixed therewith.
  • each batch of the first batch and the second batch was a coarse-grained ore
  • the third batch was a fine-grained ore, all of which were charged in a forward tilting manner.
  • coarse-grained ore was charged in the first batch by reverse tilting
  • coarse-grained ore was charged in the second batch by reverse tilting
  • fine-grained ore was charged in the third batch by forward tilting. I charged it.
  • Invention Example 12 coarse-grained ore was charged in the first batch by reverse tilting, fine-grained ore was charged in the second batch by forward tilting, and fine-grained ore was charged in the third batch by forward tilting.
  • the gas utilization rate was higher than that of Comparative Example 11, the pressure loss of the packed bed was reduced, and the reducing agent ratio and the coke ratio were reduced.
  • Invention Example 11 in which the second batch was charged in the reverse tilt was more preferable because the reducing agent ratio and the coke ratio were reduced as compared with Invention Example 12 in which the second batch was charged in the forward tilt.
  • the second batch is a fine-grained ore
  • the third batch is a coarse-grained ore
  • the tilting directions of the charging chutes of the second and third batches are reversed and ordered in four patterns.
  • the raw materials were charged.
  • the gas utilization rate was higher than that of Comparative Example 11, the pressure loss of the packed bed was reduced, and the reducing agent ratio and the coke ratio were reduced.
  • the second batch is a coarse-grained ore
  • the third batch is a fine-grained ore
  • the tilting directions of the charging chutes of the second and third batches are reversed and ordered in four patterns.
  • the raw materials were charged.
  • the gas utilization rate was higher than that of Comparative Example 11, the pressure loss of the packed bed was reduced, and the reducing agent ratio and the coke ratio were reduced.
  • Invention Examples 18 and 20 in which the third batch was charged in the forward tilt have a higher gas utilization rate and pressure loss in the packed bed than in Invention Examples 17 and 19 in which the third batch was charged in the reverse tilt. was reduced, confirming that it was more preferable.
  • the gas utilization rate was higher than that of Comparative Example 11, the pressure loss of the packed bed was reduced, and the reducing agent ratio and the coke ratio were reduced.
  • Invention Examples 22 and 24 in which the third batch was charged in the forward tilt have the same or higher gas utilization rate than Invention Examples 21 and 23 in which the third batch was charged in the reverse tilt, and the filling layer It was confirmed that the pressure loss was reduced, which was more preferable.

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Abstract

L'invention concerne un procédé pour charger une matière première dans un haut-fourneau tout en assurant une ventilation d'air à l'intérieur du four, lequel procédé permet de former une couche de minerai comprenant un mélange de coke mélangé dans lequel une réactivité de réduction élevée est maintenue.　Ce procédé pour charger une matière première dans un haut fourneau met en œuvre l'utilisation d'un dispositif de chargement sans cloche avec une goulotte de chargement, la division d'un mélange de minerai et d'un mélange de coke en au moins deux lots, et le chargement dans le haut fourneau, le minerai étant divisé en un minerai à grains grossiers, et un minerai à grains fins qui a un diamètre moyen inférieur à celui du minerai à gros grains ; le mélange de coke est mélangé au minerai à grain grossier de façon à obtenir un minerai à grain grossier avec un mélange de coke mélangé, et le mélange de coke est mélangé avec le minerai à grains fins de façon à former un minerai à grains fins avec un mélange de coke mélangé ; et, en ce qui concerne au moins le premier lot, la goulotte de chargement précédemment mentionnée est inclinée à partir du centre du four vers la paroi du four au-delà d'un point intermédiaire dans la direction radiale du haut-fourneau entre le centre du four et la paroi du four, chargeant tout ou partie du minerai à gros grains avec un mélange de coke mélangé.
PCT/JP2020/044357 2020-01-29 2020-11-27 Procédé pour charger une matière première dans un haut-fourneau WO2021152989A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202080094945.8A CN115023508B (zh) 2020-01-29 2020-11-27 向高炉中装入原料的方法
JP2021508006A JP6885528B1 (ja) 2020-01-29 2020-11-27 高炉への原料装入方法
KR1020227026245A KR20220119154A (ko) 2020-01-29 2020-11-27 고로에의 원료 장입 방법
BR112022014972A BR112022014972A2 (pt) 2020-01-29 2020-11-27 Método para carregar matéria-prima no alto-forno
EP20916867.3A EP4083235A4 (fr) 2020-01-29 2020-11-27 Procédé pour charger une matière première dans un haut-fourneau

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