WO2003062473A1 - Procede de production de metal liquide a faible teneur en silicium - Google Patents

Procede de production de metal liquide a faible teneur en silicium Download PDF

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Publication number
WO2003062473A1
WO2003062473A1 PCT/JP2003/000587 JP0300587W WO03062473A1 WO 2003062473 A1 WO2003062473 A1 WO 2003062473A1 JP 0300587 W JP0300587 W JP 0300587W WO 03062473 A1 WO03062473 A1 WO 03062473A1
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WO
WIPO (PCT)
Prior art keywords
hot metal
slag
blast furnace
pulverized coal
furnace
Prior art date
Application number
PCT/JP2003/000587
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English (en)
Japanese (ja)
Inventor
Shinji Matsubara
Yasukazu Hayasaka
Original Assignee
Jfe Steel Corporation
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 Steel Corporation filed Critical Jfe Steel Corporation
Priority to KR1020047010497A priority Critical patent/KR100611167B1/ko
Priority to BR0307107-3A priority patent/BR0307107A/pt
Priority to JP2003562340A priority patent/JP4325401B2/ja
Publication of WO2003062473A1 publication Critical patent/WO2003062473A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C21B5/023—Injection of the additives into the melting part
    • 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 technique for stably producing low silicon hot metal in a blast furnace operation in which a large amount of pulverized coal (PC) is blown from a tuyere of a blast furnace.
  • Background leakage a phenomenon for stably producing low silicon hot metal in a blast furnace operation in which a large amount of pulverized coal (PC) is blown from a tuyere of a blast furnace.
  • FIG. 1 (a) An example of pulverized coal injection equipment to the blast furnace is shown in Fig. 1 (a) and Fig. 1 (b).
  • a side wall of a blow pipe 2 for blowing air into the furnace provided at the lower part of the blast furnace 1 is obliquely inserted and provided with a lance 3 for blowing pulverized coal.
  • the pulverized coal 5 is blown out from the pulverized coal injection lance 3 into the hot air 7 flowing through the professional pipe 2 and is blown into the blast furnace 1 from the tuyere 4.
  • the pulverized coal 5 blown in this way burns in the blow pipe 2 and the tuyere 4 and in the raceway 6 formed in front of the tuyere 4, but partially unburned chars
  • the unburned char and soot are burned in the furnace, but the volatile matter in the coal is incompletely burned into soot due to incomplete combustion, but when the amount of pulverized coal blown into the blast furnace increases, Is not completely burned and consumed, but is accumulated in the furnace or discharged as part of dust from the furnace top. It is necessary to improve the reaction efficiency of pulverized coal, raise the Kogs replacement ratio, and ensure stable blast furnace operation.
  • the operation of a blast furnace that injects a large amount of pulverized coal is generally susceptible to the properties of raw fuels and tapping slag, and operational fluctuations increase.
  • the ore / cokes ratio (0 / C) in the blast furnace increases, and the heat flow ratio (heat capacity of solid charge / gas
  • the heat capacity of the furnace decreases, the sensible heat taken out of the furnace top increases, the thermal efficiency decreases, the rate of temperature rise of the charge increases in the upper and middle parts of the furnace, and fusion occurs in the lower part of the furnace.
  • the zone moves upward, its thickness increases, and the coke remains degraded due to an increase in the residence time, resulting in increased furnace pressure loss and fluctuations in operation.
  • the furnace heat level will be raised to improve the operation stability.
  • the hot metal temperature level rises and the Si concentration in the hot metal rises.
  • the ore Z coke ratio increased, coke inferiority or unburned charcoal of pulverized coal increased. Deteriorates and becomes inactive.
  • the slag flows down the vicinity of the raceway, and S 02 in the slag is reduced by C in the coke pulverized coal to generate S ⁇ gas, which is reduced by C in the hot metal and i transfers to the hot metal, and the S i concentration of the hot metal increases.
  • the situation during this is represented by the following chemical formula:
  • prior art 1 j a method of lowering the temperature of hot metal has been carried out (hereinafter referred to as “prior art 1 j”), however, in this method, slag viscosity increases (slag fluidity!
  • slag fluidity increases due to a sharp drop in hot metal temperature due to the falling off of deposits in the blast furnace, etc.
  • the effect becomes large.
  • Japanese Patent No. 3812 discloses a method for appropriately increasing the basicity of slag in the high-temperature zone by mixing and blowing a Ca 0 source or a Mg source material together with pulverized coal, along with acid oxide.
  • Japanese Patent Application Laid-Open No. 5-78718 discloses that the following formulas (3) to (5) for Sio2 in pulverized coal to be blown:
  • Japanese Patent Application Laid-Open No. 7-70616 discloses that pulverized coal having a lower Si ⁇ 2 content than non-coking coal used in coking is used as a method for reducing the base hot metal Si concentration.
  • a method has been proposed to reduce the hot metal Si concentration by using Below, "Prior art 6").
  • coal with a low content of Si02 is not necessarily inexpensive, and the restrictions on the supply and demand of raw materials are increased due to the restrictions on the raw materials used, so it is realistic to continue long-term operation. is not.
  • Basic matter 1 Lower the temperature of the high-temperature reaction zone at the tuyere tip, and control the reaction rate and the chemical equilibrium constant in Eqs. (1) and (2) so that the Si concentration in the hot metal decreases. Lowering,
  • Basic matter 2 Reduce the activity of Si ⁇ 2 in the molten slag and control it so that the chemical equilibrium constant of equation (1) becomes smaller. Controlling in the decreasing direction to lower the Si concentration in the hot metal,
  • Basic item 4 Reduce the furnace heat level to perform low-temperature tapping operation, and increase the reaction rate in Eq. (3). In addition to suppressing the silicidation (reduced Si) by lowering it, silicification is suppressed by lowering the reaction 3 ⁇ 4 ⁇ in equation (1).
  • the present inventors fluctuate in the blast furnace operation in which a large amount of pulverized coal is injected without specially procuring high-quality expensive raw materials without newly installing or remodeling special equipment.
  • Using predetermined main raw materials and auxiliary raw materials given in advance according to the raw material supply and demand process by means of adjusting the composition of these raw materials, it is possible to avoid the occurrence of accidents such as falling off of deposits in the furnace that are likely to occur during low-temperature operation of the blast furnace, etc.
  • An object of the present invention is to carry out a large-volume pulverized coal injection operation into a blast furnace, thereby enabling a low-cost and stable operation without being restricted by raw materials charged to the blast furnace.
  • An object of the present invention is to provide a method for producing low silicon hot metal which can reduce the integrated cost from the sintering process to the hot metal production process in a blast furnace using condensate.
  • the present invention provides a method for producing low silicon hot metal comprising:
  • the Mg content in slag discharged from the blast furnace is set to 5.
  • a method for producing low silicon hot metal characterized in that the hot metal is adjusted to be within a range of 5 to 8.5 mass%, and the Si concentration of the hot metal is controlled to 0.3 mas% or less.
  • C a ⁇ (ma ss%) S i ⁇ 2 (ma ss%) in the slag is 1.2 to A method for producing low-silicon hot metal, comprising operating a blast furnace within a range of 1.3 and an A12 ⁇ 3 concentration in the slag within a range of 13 to 16 mass%.
  • FIG. 1 (a) and 1 (b) are schematic longitudinal sectional views showing an example of a method of injecting pulverized coal into a blast furnace.
  • FIG. 2 is a graph illustrating the relationship between the Mg0 content of blast furnace slag and the slag ratio.
  • Figure 3 is a graph illustrating the relationship between the MgO content of blast furnace slag and the hot metal Si content.
  • FIG. 4 is a graph illustrating the relationship between the Mg0 content of the blast furnace slag and the calculated value of the viscosity of the slag.
  • FIG. 5 is a cross-sectional view showing another example of a method of injecting pulverized coal into a blast furnace.
  • FIG. 6 is a side view of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • the present inventors In the blast furnace operation (high PCR blast furnace operation) under the condition of high pulverized coal injection ratio (high PCR), the present inventors maintained fluctuating supply and demand conditions of raw fuels, maintained low cost of raw fuels, and reduced equipment costs. As a prerequisite for maintaining low cost of blast furnace slag, first, in order to improve the fluidity of blast furnace slag, adjustment of the composition of blast furnace slag was examined.
  • the component composition of the slag produced in the blast furnace is determined by the content and composition of the slag-forming components for each brand of the main and auxiliary raw materials used, and the slag-forming components of each brand of coal for the production of coke and pulverized coal. It changes depending on the content rate and its composition.
  • the viscosity of the blast furnace slag changes depending on the composition of the slag, and further changes depending on the temperature of the slag and therefore the temperature of the hot metal.
  • the main components of blast furnace slag consist of four components: Si02, CaO, 3 ⁇ 410 and ⁇ 12 ⁇ 3.
  • the content of S i ⁇ 2 and C a ⁇ depends on the basicity of slag (C a ⁇ ma ss% / S i 02mass%) as one of the important determinants of the S concentration in the hot metal component. Therefore, it is difficult to set the content of Si ⁇ 2 and CaO independently, because of the restrictions of the basicity setting value. Therefore, it is not always appropriate to use the contents of Si ⁇ ⁇ 2 and CaO as adjusting factors for slag viscosity.
  • the slag A12O3 content is Al2 ⁇ 3 is mainly contained in ash and ore in coke, so it fluctuates depending on the supply and demand balance of raw materials and fuels. For example, reflecting the recent declining trend of high-grade iron ore,
  • high alumina iron ore with a high A12 ⁇ 3 content is increasing.
  • high alumina iron ore has the advantage of being inexpensive. Therefore, it is not advisable to limit the content of A12 ⁇ 3 in slag below the conventional level, but it also involves difficulties in the iron ore raw material supply and demand process.
  • the function of the MgO component in blast furnace slag has conventionally been to adjust the viscosity of the slag.
  • the setting of the Mg ⁇ content in slag has been based on the conventional blast furnace slag ratio (Mg ⁇ —Si ⁇ 2 serpentinite—Mg ⁇ -Ca ⁇ ) dolomite, which is the MgO source auxiliary material.
  • the amount of slag per ton of pig (kg)) should be below the target upper limit determined by the specific operating conditions of the blast furnace, and the Mg ⁇ content in the slag should be the minimum required. Then, it is adjusted at the time of charging the blast furnace according to the raw material mixing ratio at that time.
  • the present inventors examined the effects and effects on the decrease in the viscosity of slag and the decrease in the Si concentration in the hot metal due to the increase in the MgO content in the slag.
  • Figure 2 shows the relationship between the slag MgO content and the slag ratio. It can be seen that the slag ratio decreases with an increase in the Mg ⁇ content.
  • Figure 3 shows the relationship between the MgO content of the slag and the hot metal Si content.
  • the hot metal Si content decreases as the Mg ⁇ content increases, and the] ⁇ ⁇ content is 7]! 1 & 3 s% It is presumed that the minimum value exists in the hot metal Si content when the temperature reaches this level.
  • FIG. 4 shows the relationship between the Mg0 content of the slag and the calculated value of the viscosity of the slag, and shows that the viscosity of the slag decreases as the MgO content increases.
  • the variation in slag viscosity in the figure is mainly due to the difference in the composition of the main raw materials between blast furnaces.
  • the index at 1.5 m above the tuyere is an index that indicates the air permeability of the entire blast furnace.
  • the tapping temperature is maintained at 1480 ° C or higher even in the blast furnace operation in which pulverized coal is blown in at more than 15 Okg / t-hot metal.
  • the slag ratio was 30 Okg / t or less of hot metal, stable low-silicon operation was possible without deteriorating the air permeability in the furnace.
  • the present invention has been made based on the above findings.
  • the method for producing low-silicon hot metal according to the present invention is characterized in that, in the method for producing low-silicon hot metal in a pulverized coal injection operation in which pulverized coal is blown in at least 150 kgZt—hot metal, slag discharged from the blast furnace is provided. It is characterized in that the content of Mg ⁇ in the steel is adjusted within the range of 5.5 to 8.5mass%, and the content of hot metal is controlled to 0.3mass% or less.
  • the method of the present invention is performed as follows. Pulverized coal is introduced into the blast furnace 1 from the lance 3 for injecting pulverized coal, which is installed obliquely through the blow pipe 2 attached to the tuyere 4 of the blast furnace 1, with 150 kgZt t-hot metal or more, hot air 7 and hot air 7. To produce hot metal.
  • the charged material has a Mg ⁇ content of the component composition of the blast furnace slag discharged from the taphole 8.
  • the composition of the amount to be charged is determined in consideration of the composition of the slagging components in the main raw material and auxiliary raw material so as to fall within the range of 5.5 to 8.5 mass%.
  • Furnace heat levels are also used in high heat level operations, such as those used in conventional blast furnace operations with a pulverized coal injection ratio of 150 kgZt-hot metal or higher, or in low Si hot metal production operations. No low-temperature tapping operation is performed. No special action is required for other blast furnace operating conditions.
  • the tapping temperature is about 1480 or higher, there is no particular limitation.However, if the following conditions are used, the cost of hot metal in the integrated process from the sinter production process to the blast furnace operation can be reduced. It is more advantageous, and can maintain good properties of ore in blast furnace and reduce the blast furnace slag ratio (slag slag hot metal), contributing to the stability of high-PRC blast furnace operation.
  • the sintered ore with Si S2 ⁇ 4.5mass% and MgO ⁇ 1.3mass% is used for 70mass% or more of the charge except the charged coke.
  • charge ⁇ ⁇ source auxiliary material In order to adjust the content to fall within the range of 5.5 to 8.5 mass%, : charge ⁇ ⁇ source auxiliary material.
  • serpentine-dolomite or the like is used as the Mg-source auxiliary material.
  • the furnace heat level is adjusted so as to obtain low silicon hot metal, for example, so that the hot metal Si concentration is 0.3 Omass% or less.
  • the blast furnace slag ratio is not less than 2701: -hot metal, but is not more than 300 kgZt-hot metal. Absent.
  • CaO (mass%) ZS i ⁇ 2 (mass%) (basicity) in the blast furnace slag is in the range of 1.2 to 1.3, and the AI2O3 concentration is It is desirable to operate the blast furnace with the adjustment within the range of 13 to 16 mass%.
  • the S content of the hot metal can be stably kept below a predetermined target value.
  • a 1 2 Rei_3 content high so-called high alumina iron ore in recent years increasing the aforementioned e.g., A L2_rei_3 ⁇ 3.
  • Oma ss%) can be used as a charging raw material, contributing to alleviating restrictions on the iron ore raw material supply and demand process and reducing raw material costs.
  • the slag composition especially the MgO concentration, was set to 5.5 to 8.5 mass%, which was higher than that in normal operation, so that the viscosity of the slag was reduced and The vapor partial pressure of Mg in the high temperature reaction zone near the mouth becomes high.
  • the viscosity of the slag is reduced, the liquid permeability in the furnace core is improved, and the molten slag flows down the furnace core without passing through the raceway, which is the high-temperature reaction area near the tuyere.
  • the A12 ⁇ 3 content ratio within the range of 13 to 16 mass%, as described above, it means that there is no need to specify the iron ore brand ⁇ coke coking coal brand and use
  • the slag viscosity is within the range where the slag viscosity does not rise, and the blast furnace operation can be further facilitated.
  • the blast furnace operating method of the present invention makes it possible to stably perform low-silicon operation of hot metal even if a large amount of pulverized coal is blown from tuyeres.
  • FIG. 5 is a sectional view showing another example of a method of injecting pulverized coal into a blast furnace
  • FIG. 6 is a side view of FIG.
  • reference numeral 3 denotes two pulverized coal blowing lances inserted into the blow pipe 2 connected to the tuyere 4.
  • the center axis (1) of each lance 3 does not cross the axis (L) of the blow pipe 2 so that the tip of the lance 3 faces the tuyere 4 side, and the center axis (0 ) Are arranged so as to be axially symmetric.
  • the pulverized coal is blown into the pipe 2 from the two lances 3 together with the carrier gas at a flow rate of about 15111 / sec, but the tips of the two lances 3 do not face each other on the same straight line.
  • the pulverized coal Since the pulverized coal is arranged at the axisymmetric position, the pulverized coal is blown into the pipe 2 without interfering with each other, and rapidly diffuses in the blow pipe 2. Moreover, the pulverized coal moves to the tuyere 4 side while turning inside the professional pipe 2, so that the contact efficiency with oxygen in the hot air is further improved, and therefore, the combustion efficiency of the pulverized coal is improved.
  • Carrier gas, nitrogen, air, oxygen, CO consisting of at least one of C_ ⁇ 2 gas.
  • Tests were conducted on examples within the range of the method for producing low silicon hot metal according to the present invention, and comparative examples outside the range.
  • the blast furnace operation method and conditions in the examples were performed according to the methods and conditions described above in the embodiment of the present invention.
  • Tables 1 and 2 show the test results
  • Tables 3 and 4 show the composition of pulverized coal and sinter.
  • Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Pulverized coal injection ratio (kg t-hot metal) 120 120 150 200 Blending of raw materials Sinter-A 75 76 77 78 Blast furnace Sinter-B--- ⁇ Clay 390 390 366 326 Condition Slag component MgO (%) 5.0 5.0 5.0 5.0 5.0
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Example 6
  • Example 7 Example 8
  • the furnace heat level was the tapping temperature, and the air permeability of the entire blast furnace was determined by the gas pressure loss from 1.5 m above the tuyere to the top of the furnace.
  • the viscosity of slag was evaluated by the occurrence of slag overflow in the slag gutter, and the stability of blast furnace operation was evaluated by tapping ratio. From these results, the following matters are clear.
  • Pulverized coal injection ratio is low outside the scope of the present invention.
  • the other main conditions were the same as in Comparative Example 1; Although the Si concentration decreases, the viscosity of the slag increases. Due to the decrease in the combustion rate of pulverized coal, the air permeability in the furnace tends to deteriorate, and the operation stability is not sufficiently ensured.
  • Comparative Example 2 On the basis of the operating conditions in Comparative Example 1, when the PCR was increased to 150 to 20 OkgZt—hot metal within the scope of the present invention (Comparative Examples 3 and 4, respectively), the furnace The overall air permeability deteriorates, and especially the air permeability and liquid permeability in the lower part of the blast furnace deteriorate. As a result, the stability of the blast furnace operation becomes poor.
  • the furnace heat level was raised to the normal level from the low level in Comparative Example 2 to restore the temperature, and at the same time, the PCR was performed at 150 to 200 kg / t-hot metal within the scope of the present invention.
  • the viscosity of the slag was reduced, and the fluidity of the slag was improved.
  • the liquid permeability was improved.
  • the pressure loss at the lower part of the furnace was reduced and the hot metal Si concentration was reduced, and a satisfactory low silicon hot metal was produced.
  • the stability of blast furnace operation was also obtained.
  • Example 7 In the blast furnace operation of Example 7, the furnace heat level was lower than the normal level under the operating conditions of Example 6, but the air permeability in the furnace was secured by increasing the slag flow improvement effect. In addition to stable operation, hot metal with lower Si concentration was produced.
  • Example 8 In Example 8, an eccentric double lance was used as a lance for pulverized coal injection under substantially the same conditions as in Example 2. (Examples 1 to 7 use a single lance.) As a result, the pulverized coal combustion efficiency was improved, and the pulverized coal was 20 O kg / t in Example 2 after maintaining the blast furnace air permeability constant. However, in Example 8, it increased to 2 16 kg / t, and neither the slag viscosity nor the Si concentration increased.
  • Example 9 uses an eccentric double lance under almost the same conditions as Example 6. In this case, as a result of keeping pulverized coal constant at 200 kg / t, the slag ratio decreased and the Si concentration decreased.
  • the Si concentration of the hot metal can be reduced in a high-volume blast furnace operation with a high level of pulverized coal of 150 kg / t-hot metal or more without being restricted by the raw material supply and demand process. Operations that can be suppressed can be performed stably. In that case, it is not necessary to keep the furnace heat level low, nor is it necessary to strictly limit the upper limit of the blast furnace slag ratio. It is possible to provide a method of injecting pulverized coal into such a blast furnace, which brings about an industrially useful effect.

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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)

Abstract

L'invention concerne un procédé de production d'un métal liquide à faible teneur en silicium consistant à injecter environ 150 kg ou plus de charbon pulvérisé par tonne de métal liquide, et à maîtriser une teneur en MgO entre 5,5 et 8,5 % dans un laitier de haut fourneau afin de s'assurer d'une teneur en Si inférieure ou égale à 0,3 % dans le métal liquide. Dans un mode de réalisation préféré, la température du métal liquide sorti du haut fourneau est supérieure ou égale à 1480 °C et le rapport de laitier est de 270 kg ou plus par tonne de métal liquide.
PCT/JP2003/000587 2002-01-24 2003-01-23 Procede de production de metal liquide a faible teneur en silicium WO2003062473A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020047010497A KR100611167B1 (ko) 2002-01-24 2003-01-23 저실리콘 용선의 제조방법
BR0307107-3A BR0307107A (pt) 2002-01-24 2003-01-23 Método para produção de ferro fundido com baixo teor de silìcio
JP2003562340A JP4325401B2 (ja) 2002-01-24 2003-01-23 低シリコン溶銑の製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-15702 2002-01-24
JP2002015702 2002-01-24

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WO2003062473A1 true WO2003062473A1 (fr) 2003-07-31

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PCT/JP2003/000587 WO2003062473A1 (fr) 2002-01-24 2003-01-23 Procede de production de metal liquide a faible teneur en silicium

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JP (1) JP4325401B2 (fr)
KR (1) KR100611167B1 (fr)
CN (1) CN1615370A (fr)
BR (1) BR0307107A (fr)
TW (1) TWI223006B (fr)
WO (1) WO2003062473A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007119891A (ja) * 2005-10-31 2007-05-17 Nippon Steel Corp 高炉操業方法
JP7130898B2 (ja) 2019-03-28 2022-09-06 株式会社神戸製鋼所 高炉の操業方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111057807B (zh) * 2020-01-07 2021-08-17 武钢集团昆明钢铁股份有限公司 一种超低硅低硫合格生铁的冶炼方法

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPH03215620A (ja) * 1990-01-19 1991-09-20 Nkk Corp 高炉へのフラックス吹込み方法
JPH08157913A (ja) * 1994-10-05 1996-06-18 Nippon Steel Corp 高炉の操業法
JPH1030104A (ja) * 1996-07-16 1998-02-03 Nippon Steel Corp 高炉操業方法
JPH1129803A (ja) * 1997-07-10 1999-02-02 Nippon Steel Corp 高被還元性焼結鉱を使用した高炉操業方法
JPH1143710A (ja) * 1997-07-23 1999-02-16 Nippon Steel Corp 微粉炭多量吹き込み時の高炉操業方法
JP2001107114A (ja) * 1999-10-06 2001-04-17 Nippon Steel Corp 高被還元性焼結鉱を使用した高炉操業方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03215620A (ja) * 1990-01-19 1991-09-20 Nkk Corp 高炉へのフラックス吹込み方法
JPH08157913A (ja) * 1994-10-05 1996-06-18 Nippon Steel Corp 高炉の操業法
JPH1030104A (ja) * 1996-07-16 1998-02-03 Nippon Steel Corp 高炉操業方法
JPH1129803A (ja) * 1997-07-10 1999-02-02 Nippon Steel Corp 高被還元性焼結鉱を使用した高炉操業方法
JPH1143710A (ja) * 1997-07-23 1999-02-16 Nippon Steel Corp 微粉炭多量吹き込み時の高炉操業方法
JP2001107114A (ja) * 1999-10-06 2001-04-17 Nippon Steel Corp 高被還元性焼結鉱を使用した高炉操業方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007119891A (ja) * 2005-10-31 2007-05-17 Nippon Steel Corp 高炉操業方法
JP7130898B2 (ja) 2019-03-28 2022-09-06 株式会社神戸製鋼所 高炉の操業方法

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BR0307107A (pt) 2004-12-28
TW200302284A (en) 2003-08-01
CN1615370A (zh) 2005-05-11
TWI223006B (en) 2004-11-01
KR100611167B1 (ko) 2006-08-09
KR20040071287A (ko) 2004-08-11
JP4325401B2 (ja) 2009-09-02
JPWO2003062473A1 (ja) 2005-05-26

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