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WO2012049974A1 - Procédé de production de fer réduit - Google Patents

Procédé de production de fer réduit Download PDF

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Publication number
WO2012049974A1
WO2012049974A1 PCT/JP2011/072310 JP2011072310W WO2012049974A1 WO 2012049974 A1 WO2012049974 A1 WO 2012049974A1 JP 2011072310 W JP2011072310 W JP 2011072310W WO 2012049974 A1 WO2012049974 A1 WO 2012049974A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixture
water
reduced iron
binder
kneading
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2011/072310
Other languages
English (en)
Japanese (ja)
Inventor
幸弘 上杉
直史 寺本
祐輝 ▲桑▼内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to CN2011800491506A priority Critical patent/CN103154276A/zh
Priority to KR1020137009208A priority patent/KR20130080844A/ko
Priority to BR112013008360A priority patent/BR112013008360A2/pt
Publication of WO2012049974A1 publication Critical patent/WO2012049974A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates

Definitions

  • the present invention relates to a method for producing reduced iron.
  • This application claims priority based on Japanese Patent Application No. 2010-231512 filed in Japan on October 14, 2010, the contents of which are incorporated herein by reference.
  • dust that is generated mainly in blast furnaces, converters, electric furnaces, melting furnaces, etc., containing iron as a main component is reused as a raw material.
  • the present invention has been made in view of the above problems, and the object of the present invention is to further improve the granulation property when agglomerating a mixture as a raw material for reduced iron. It is providing the manufacturing method of reduced iron.
  • the present invention employs the following aspects. (1) That is, in the method for producing reduced iron according to one embodiment of the present invention, water at 60 ° C. or more and 90 ° C. or less is added to a mixture containing an iron oxide raw material and a reducing material that are both in powder form and kneaded. A kneading step to perform; a granulation step to agglomerate the mixture after the kneading step to obtain an agglomerate; a reduction step to reduce the agglomerate after the granulation step to produce reduced iron; Have The moisture referred to in the present invention includes water and water vapor.
  • a binder soluble in water may be further added to the mixture.
  • the binder may be a liquid organic binder or a powdery organic binder.
  • the binder may be a powdered organic binder and a cereal starch selected from the group consisting of rice, tapioca, rye and corn.
  • the water content of the mixture may be 6% to 9% by adding the water.
  • the particle diameter of the mixture before kneading in the kneading step in the aspect described in (1) may be 70 ⁇ m to 500 ⁇ m with an 80% particle diameter under a sieve.
  • the water content of the mixture before the water is added in the kneading step in the aspect described in (1) may be 1% to 3%.
  • the mixture containing the iron oxide raw material and the reducing material when the mixture containing the iron oxide raw material and the reducing material is granulated, moisture of 60 ° C. or more and 90 ° C. or less is added to the mixture. Uniformity can be achieved, and the granulation property in the granulation step can be further improved.
  • the moisture includes water and water vapor.
  • FIG. 1 is an explanatory view for explaining an example of a manufacturing process of reduced iron.
  • Iron oxide raw materials such as iron dust and iron ore collected from each facility in the steelworks and reducing materials such as coal, coke, and fine carbon are stored in the hopper 11 and the like in advance.
  • the iron oxide raw material and the reducing material are blended so as to have a preset blending ratio, and then charged into the pulverizer 13.
  • a pulverizer 13 typified by a vibration mill such as a ball mill pulverizes the charged iron oxide raw material and the reducing material to a predetermined particle size while mixing.
  • the particle sizes of the iron oxide raw material and the reducing material after pulverization may be appropriately set according to values suitable for a reducing furnace such as a rotary hearth furnace and a rotary kiln used for producing reduced iron.
  • the mixture of the pulverized iron oxide raw material and the reducing material is conveyed to the kneader 15.
  • the kneader 15 receives and kneads the mixture pulverized to a predetermined particle size by the pulverizer 13.
  • the kneading machine 15 often performs a humidity conditioning process for adding water to the mixture until the water content is suitable for charging into a reduction furnace used for producing reduced iron.
  • An example of the kneading machine 15 is a mix muller, but various types of kneading machines can be used besides this.
  • the mixture kneaded by the kneader 15 is conveyed to the molding machine 17.
  • a molding machine 17 such as a pan pelletizer (dish granulator), a double roll compressor (briquette making machine), an extrusion molding machine, etc. accepts and molds a mixture containing an iron oxide raw material and a reducing material, such as pellets and briquettes. Agglomerates like Here, the agglomerated material refers to pellets, briquettes, extruded products that have been cut by extrusion molding, and granular materials / agglomerated materials such as mass-adjusted agglomerated materials.
  • the molding machine 17 agglomerates the mixture so that the mixture does not scatter in the furnace ascending gas flow when, for example, it is heated and charged into the melting furnace 23 after drying and heating reduction described later. .
  • the generated agglomerated material is charged into the dryer 19.
  • the dryer 19 receives the agglomerated material from the molding machine 17 and dries it.
  • the moisture content is suitable for the heating reduction process described later (in other words, the moisture content suitable for each reduction furnace used for producing reduced iron). : For example, 1% or less).
  • the agglomerated product adjusted to a predetermined moisture content is conveyed to a reduction furnace 21 described later.
  • a reduction furnace 21 such as a rotary hearth furnace (RHF) or a rotary kiln heats and reduces the charged agglomerate in a heating atmosphere using an LNG burner, a COG burner, or the like, and reduces the agglomerate. It will be iron.
  • the reducing furnace heats the agglomerate to, for example, about 1000 to 1300 ° C. to reduce the agglomerate and produce reduced iron.
  • the manufactured reduced iron is conveyed to the melting furnace 23.
  • the melting furnace 23 melts the reduced iron supplied from the reduction furnace 21 in the state of, for example, a high-temperature pellet to form molten iron.
  • generated by the melting furnace 23 is conveyed using a ladle etc., and after using a desulfurization and refining process, it is utilized as crude molten steel.
  • the method for producing reduced iron according to the present embodiment produces reduced iron by heating and reducing agglomerates formed by mixing an iron oxide raw material and a reducing material.
  • iron dust e.g., iron-containing cold material melting converter, refining converter, dust melting converter, etc. is generated and collected by a wet dust collector or the like). Converter dust, blast furnace dust, mill scale, electric furnace dust, etc.), non-ferrous smelting dust, and iron ore.
  • the reducing material according to the present embodiment for example, coal such as pulverized coal, carbon material such as coke, and fine carbon can be used.
  • the raw material mixture may not be agglomerated and powder may remain.
  • Such residual powder hinders the improvement of granulation performance in the granulation process. Therefore, as a result of intensive studies aimed at improving granulation properties in the granulation step, the present inventor added water at a temperature of 60 ° C. or higher and 90 ° C. or lower to the raw material mixture during the granulation step.
  • the inventors have conceived that it is possible to improve the granulation property in the granulation step.
  • the diffusion efficiency of moisture into the mixture is dramatically increased.
  • moisture penetrates deeper to a deeper depth, so that the strength of the agglomerated product to be produced can be further improved without increasing the amount of binder to be added.
  • FIG. 2 is a flowchart showing a flow of a method for producing reduced iron according to the present embodiment.
  • an iron oxide raw material selected from the group consisting of iron making dust and iron ore generated in the iron making process is mixed with the reducing material (step S101) and pulverized from the hopper 11.
  • the machine 13 is charged.
  • the pulverized coal used as the reducing material it is possible to use, for example, those having an 80% particle size of about 5 mm to 10 mm under a sieve and a water content of about 8 to 12%.
  • the blending ratio of the iron oxide raw material and the reducing material is adjusted in consideration of suitable conditions for obtaining good reduced iron in the reduction step described later. For example, it can be set to about 90:10.
  • This mixture has a particle size of, for example, about 4 mm when charged into the pulverizer.
  • the mixture of the iron oxide raw material and the reducing material is pulverized by the pulverizer 13 until the particle size becomes, for example, 70 ⁇ m to 500 ⁇ m (80% particle size under sieve), preferably 150 ⁇ m to 300 ⁇ m.
  • the particle size of the mixture By setting the particle size of the mixture to 70 ⁇ m to 500 ⁇ m, it becomes possible to produce reduced iron with a high metallization rate with a small variation in metallization rate (for example, about 6% or less), and the lower limit of the particle size By setting it as 70 micrometers, it becomes possible to suppress the explosion of the agglomerate in the reduction process.
  • the particle size of the mixture to 150 ⁇ m to 300 ⁇ m, it is possible to produce reduced iron with a high metallization rate with a very small variation in metallization rate (for example, about 3% or less).
  • a very small variation in metallization rate for example, about 3% or less.
  • step S103 it is preferable to adjust the water content of the mixture made of the iron oxide raw material and the reducing material to about 1% to 3%. By setting it as this moisture content, it becomes possible to hold
  • the pulverizer for pulverizing the mixture for example, a vibration mill such as a ball mill or a rod mill can be used.
  • the processing speed of the ball mill used for pulverization is appropriately set. That's fine.
  • the pulverization ratio is calculated from the target value of the particle diameter on the exit side of the vibration mill (ball mill) and the particle diameter on the entry side of the vibration mill. Then, by using the calculated grinding ratio and the theoretical capacity curve of the vibration mill at the target value of the moisture content on the exit side of the vibration mill, as described in Patent Document 1, It is possible to determine the processing speed.
  • the moisture content of the mixture at the time of charging the pulverizer is set to a value at which the vibration mill exhibits appropriate pulverizability. It becomes possible to hold, and it is not necessary to constantly change the control of the vibration mill during grinding. Moreover, even if the moisture content of the iron oxide raw material fluctuates due to various factors, the millability of the vibration mill is maintained at a suitable value by appropriately controlling the setting of the dryer 12 during drying before mixing. It becomes possible.
  • the pulverized mixture is charged into a kneader 15 such as a mix muller so that the water content becomes a value appropriate for kneading (for example, about 6 to 9%). And then kneaded (step S105). Further, when kneading the mixture, a predetermined binder may be added to the mixture in order to improve the strength of the agglomerated product to be produced.
  • a kneader 15 such as a mix muller so that the water content becomes a value appropriate for kneading (for example, about 6 to 9%).
  • a predetermined binder may be added to the mixture in order to improve the strength of the agglomerated product to be produced.
  • moisture having a temperature of 60 ° C. or more and 90 ° C. or less is used in order to adjust the moisture content of the mixture.
  • any binder can be used as long as it is soluble in water at 60 ° C. or higher and 90 ° C. or lower as the binder used in the kneading step.
  • a binder include a liquid organic binder and a powder organic binder.
  • liquid organic binders include molasses and lignin.
  • the powdery organic binder include starch of grains such as rice, tapioca, rye and corn.
  • these organic binders when the necessary moisture and binder addition in the kneading step are added as a slurry, the addition is viscous and does not mix well in the kneading step. Therefore, the powder form is better than the liquid form. Since the organic system is vaporized during the reduction and contributes to the improvement of the reduction, it is particularly preferable to use a powdery organic binder.
  • the solubility of the binder itself in water is improved, and as a result, the dispersion efficiency of the binder can be improved.
  • the binder itself reaches the entire mixture, and the strength of the agglomerated product to be produced can be further improved.
  • an inorganic binder such as cement, bentonite, fly ash and the like may be further added.
  • the amount of the binder added to the mixture it is possible to increase the strength of the agglomerated product to be produced, but from the viewpoint of production cost etc., the total mass of the mixture to be kneaded On the other hand, it is preferably 2% or less during drying.
  • a molding machine 17 such as a pan pelletizer (dish type granulator), a double roll compressor (briquette making machine), an extrusion molding machine (step). S107), resulting in an agglomerated product.
  • the produced agglomerated material is dried by the dryer 19, and has a moisture content of 1% or less, for example (step S109).
  • the agglomerated product after drying is charged into a reduction furnace 21 such as RHF and subjected to a reduction treatment.
  • the agglomerated product according to the present embodiment exhibits not only good granulation properties but also good crushing strength by using moisture at 60 ° C. or higher and 90 ° C. or lower in the kneading step. Therefore, the agglomerate is hardly broken in the reduction furnace 21 even in the reduction step, and the agglomerate can be sufficiently reduced.
  • the temperature in the reduction furnace 21 is set to about 1350 ° C., and the speed of the rotating bed is set so that the reduction process is completed in about 15 minutes. Is possible. By performing such a reduction treatment, it is possible to efficiently produce reduced iron that is difficult to break and has a high metalization rate.
  • the method for producing reduced iron it is possible not only to improve the granulation property in the granulation step but also to prevent cracking and to achieve a high metallization rate. It is possible to produce reduced iron. Therefore, it is possible to improve the oxygen intensity of the reduced iron melting converter, and it is possible to maintain hot metal productivity at a high level.
  • agglomerates were produced according to the procedure shown in FIG.
  • a ball mill (diameter ⁇ length: 3.3 m ⁇ 6.0 m, input amount: 40 ton / h, motor capacity: 700 KW, ball: 49 ton) is used, and the kneading step (step S105). ) Used a mix muller.
  • a double roll compressor was used, and in the drying step (Step S109), a band dryer was used.
  • ironworks dust containing converter dust and blast furnace dust was used as an iron oxide raw material, and coal was used as a reducing material.
  • the iron oxide raw material and the reducing material were mixed so that it might become mass ratio of 87:13, and it was set as the mixture.
  • the particle size of the mixture was 80 ⁇ m under sieve and 300 ⁇ m or less.
  • water was added so that the water content was 8.0%.
  • the difference between the examples and the comparative examples is the temperature of moisture used in the kneading step.
  • the water permeation time into the mixture corresponds to a water content of 8% with respect to this mixture after collecting 20 g of the mixture before mixing and mixing the iron oxide raw material and the reducing material at the above-mentioned ratio.
  • the temperature of the moisture to be added is five types of 0 ° C., 15 ° C., 60 ° C., 80 ° C. and 90 ° C., and in FIG. Show.
  • the use of moisture at temperatures of 60 ° C., 80 ° C., and 90 ° C. in the kneading process reduces the presence of lumps compared to when moisture at 15 ° C. is used.
  • the degree of decrease in the presence of lumps increases.
  • the use of moisture at a temperature of 90 ° C. in the kneading step reduces the amount of lumps to about 87% compared to when moisture at 15 ° C. is used.
  • This result shows that by using moisture at 60 ° C. or more and 90 ° C. or less (in this example, moisture at 60 ° C., 80 ° C. and 90 ° C.), the moisture diffuses more uniformly into the mixture, and the moisture in the mixture It is shown that the homogenization of the material is realized and the granulation property is improved.
  • the ratio of corn starch dissolved in water having a water temperature of 20 ° C. was 40%, whereas the ratio of dissolution in water having a water temperature of 60 ° C. was about
  • the dissolution rate was about 70% with respect to moisture having a water temperature of 80 ° C., and the dissolution rate was about 96% with respect to moisture having a water temperature of 90 ° C.
  • the agglomerate which measured crushing strength is the agglomerate manufactured by adding the water of the temperature of 15 degreeC, 60 degreeC, 80 degreeC, 90 degreeC, 120 degreeC, 160 degreeC, and 200 degreeC, respectively, and the said There are a total of 14 types of agglomerates prepared by further adding (externally adding) 1% corn starch to the mixture and adding moisture at the above temperature.
  • the crushing strength of the agglomerate produced by adding water at 90 ° C. was measured in the same manner.
  • the agglomerated material produced has an elliptical shape with a major axis of 20 to 30 mm.
  • the crushing strength is remarkably improved when the temperature of the added water is 60 ° C. or more both in the case where the binder is not added and in the case where the binder is added.
  • the temperature of the added water is 90 ° C. to 200 ° C. in both the case where the binder is not added and the case where the binder is added, the crushing strength has a substantially constant value. I understand.
  • the upper limit of the temperature of the water added to the mixture is determined by the kneading step and the heat resistance temperature of the equipment used in each step performed after the kneading step, the equipment restrictions of the steam supply equipment, etc., and the dissolution ratio in water in FIG. Since the temperature of water at 90 ° C. reaches nearly 100%, the temperature of water for improving the strength of the agglomerated product to be produced is optimally 60 ° C. or higher and 90 ° C. or lower.
  • the crushing strength of the agglomerated product in which the amount of binder added was reduced by 21% and water at 90 ° C. was added was the crushing strength when water at 15 ° C. was added to the mixture containing the binder. It can be seen that they have similar values. This result indicates that the amount of binder added can be controlled by adding water at 60 ° C. or higher and 90 ° C. or lower to the mixture, and the method for producing reduced iron according to the present embodiment is used. This suggests that it is possible to expand the range of operations for producing reduced iron.
  • the method for producing reduced iron of the present invention it is possible to further improve the granulation property when agglomerating a mixture as a raw material of reduced iron.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)

Abstract

Ce procédé de production de fer réduit comprend : une étape de malaxage consistant à ajouter de l'eau ayant une température de 60-90°C inclus à un mélange comprenant une matière brute d'oxyde de fer pulvérulent et une matière réductrice pulvérulente et à malaxer le mélange résultant ; une étape de granulation consistant à broyer le mélange obtenu dans l'étape de malaxage pour produire une matière granulée ; et une étape de réduction consistant à réduire la matière granulée obtenue dans l'étape de granulation pour produire du fer réduit.
PCT/JP2011/072310 2010-10-14 2011-09-29 Procédé de production de fer réduit Ceased WO2012049974A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2011800491506A CN103154276A (zh) 2010-10-14 2011-09-29 还原铁的制造方法
KR1020137009208A KR20130080844A (ko) 2010-10-14 2011-09-29 환원철의 제조 방법
BR112013008360A BR112013008360A2 (pt) 2010-10-14 2011-09-29 método de fabricação de ferro reduzido

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JP2010231512A JP5423645B2 (ja) 2010-10-14 2010-10-14 還元鉄の製造方法
JP2010-231512 2010-10-14

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KR (1) KR20130080844A (fr)
CN (1) CN103154276A (fr)
BR (1) BR112013008360A2 (fr)
WO (1) WO2012049974A1 (fr)

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JP6244920B2 (ja) * 2014-01-09 2017-12-13 新日鐵住金株式会社 セメント含有成型物の昇温・乾燥方法及び装置
CN104357656A (zh) * 2014-11-20 2015-02-18 湖北丹江口市宝洲冶金材料有限公司 一种有机粘结剂及用其生产的高炉炼铁用球团
CN104498709A (zh) * 2014-11-20 2015-04-08 湖北丹江口市宝洲冶金材料有限公司 一种有机粘结剂及用其生产的钢厂管道灰压球
KR20200000676A (ko) * 2018-06-25 2020-01-03 주식회사 포스코 함철 브리켓 및 그 제조방법
JP7445122B2 (ja) * 2020-03-18 2024-03-07 日本製鉄株式会社 塊成化物の製造方法、及び還元鉄の製造方法

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JPS6342315A (ja) * 1986-08-05 1988-02-23 Kobe Steel Ltd 鉱石の溶融還元方法
JPS6383205A (ja) * 1986-09-29 1988-04-13 Nkk Corp 高炉操業方法
JPH11193423A (ja) * 1997-10-30 1999-07-21 Kobe Steel Ltd 酸化鉄ペレットおよびその製造方法、並びに還元鉄ペレットおよびその製造方法
JP2001303115A (ja) * 2000-04-25 2001-10-31 Nippon Steel Corp 回転炉床式還元炉の操業方法、および、酸化金属の還元設備
JP2002206120A (ja) * 2000-10-30 2002-07-26 Nippon Steel Corp 還元炉向けペレットとその製造方法、および、酸化金属の還元方法

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JP2762913B2 (ja) * 1994-02-25 1998-06-11 株式会社神戸製鋼所 固体還元剤を内装した粉鉄鉱石の塊成化物を還元する方法
ES2323763T3 (es) * 2000-10-30 2009-07-24 Nippon Steel Corporation Granulos sin tratar que contienen oxidos metalicos para horno reductor y metodo para su produccion, metodo para reduccion de los mismos.
JP4299548B2 (ja) * 2003-01-23 2009-07-22 新日本製鐵株式会社 酸化金属の還元方法、および、亜鉛および鉛の濃縮方法
JP4348387B2 (ja) * 2007-10-19 2009-10-21 新日本製鐵株式会社 予備還元鉄の製造方法
JP2010196148A (ja) * 2009-02-27 2010-09-09 Nippon Steel Corp 鉄原料およびその製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6342315A (ja) * 1986-08-05 1988-02-23 Kobe Steel Ltd 鉱石の溶融還元方法
JPS6383205A (ja) * 1986-09-29 1988-04-13 Nkk Corp 高炉操業方法
JPH11193423A (ja) * 1997-10-30 1999-07-21 Kobe Steel Ltd 酸化鉄ペレットおよびその製造方法、並びに還元鉄ペレットおよびその製造方法
JP2001303115A (ja) * 2000-04-25 2001-10-31 Nippon Steel Corp 回転炉床式還元炉の操業方法、および、酸化金属の還元設備
JP2002206120A (ja) * 2000-10-30 2002-07-26 Nippon Steel Corp 還元炉向けペレットとその製造方法、および、酸化金属の還元方法

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CN103154276A (zh) 2013-06-12
JP5423645B2 (ja) 2014-02-19
JP2012082493A (ja) 2012-04-26
KR20130080844A (ko) 2013-07-15
BR112013008360A2 (pt) 2016-06-14

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