WO2011019086A1 - 高炉操業方法 - Google Patents

高炉操業方法 Download PDF

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Publication number
WO2011019086A1
WO2011019086A1 PCT/JP2010/063797 JP2010063797W WO2011019086A1 WO 2011019086 A1 WO2011019086 A1 WO 2011019086A1 JP 2010063797 W JP2010063797 W JP 2010063797W WO 2011019086 A1 WO2011019086 A1 WO 2011019086A1
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WO
WIPO (PCT)
Prior art keywords
coke
ore
blast furnace
layer
ferro
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/JP2010/063797
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English (en)
French (fr)
Japanese (ja)
Inventor
佐藤健
野内泰平
藤本英和
庵屋敷孝思
佐藤秀明
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JFE Steel Corp
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JFE 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 JFE Steel Corp filed Critical JFE Steel Corp
Priority to EP10808267.8A priority Critical patent/EP2450459B1/en
Priority to BR112012002859-6A priority patent/BR112012002859B1/pt
Priority to CN201080035353.5A priority patent/CN102471809B/zh
Priority to KR1020127004267A priority patent/KR101318044B1/ko
Priority to US13/388,786 priority patent/US8945274B2/en
Publication of WO2011019086A1 publication Critical patent/WO2011019086A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • 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

Definitions

  • the present invention relates to a method for operating a blast furnace when using ferro-coke produced by molding and dry distillation of a mixture of coal and iron ore.
  • a method using ferro-coke as a blast furnace raw material and utilizing the effect of lowering the temperature of the thermal preservation zone of the blast furnace by using ferro-coke is effective (for example, see Patent Document 1). ).
  • Ferro-coke produced by dry distillation of a molded product formed by mixing coal and iron ore promotes reduction of sintered ore due to its high reactivity, and contains partially reduced iron ore. Therefore, the heat storage zone temperature of the blast furnace can be lowered, and the reducing material ratio can be lowered.
  • a blast furnace operating method using ferro-coke as disclosed in Patent Document 1, a method of mixing ore and ferro-coke and charging it into the blast furnace can be mentioned.
  • Ferro-coke has the following formula (a) compared to conventional coke for metallurgical production produced by dry distillation of coal in a coke oven or the like (hereinafter referred to as “chamber coke” to be distinguished from ferro-coke). It is characterized by high reactivity with the CO 2 gas shown in FIG.
  • the reaction of the following formula (a) can be said to be a reaction for regenerating CO 2 produced by the reduction of the ore shown in the following formula (b) into CO gas having reducing power.
  • Non-Patent Document 1 The fused layer has few voids because the softened or deformed ores are fused together, and has a high gas permeability resistance (for example, see Non-Patent Document 2). This means that the reducing gas hardly enters the fusion layer.
  • the reduction rate of the sintered ore in the fusion layer is about 65 to 70%, and the reduction is not completed.
  • the ore that has not been reduced in the fused layer is melted and dropped in a state where the FeO concentration is high, and reduction by solid carbon shown in the following formula (c) occurs.
  • ferro-coke When using ferro-coke in blast furnace operation, if ferro-coke is mixed with ore and used, ferro-coke exists in the fusion layer in the temperature range where the fusion layer is formed. As described above, when the reduction of the ore is not completed in the fusion layer, there is a problem that the gasification reaction of ferrocoke in the fusion layer is stagnant. In order to realize the high reactivity characteristic of ferro-coke, that is, the rapid conversion of CO 2 gas to CO gas in the fusion layer, CO gas is introduced into the fusion layer and reduction of unreduced ore. To generate CO 2 .
  • an object of the present invention is to solve such problems of the prior art and to prevent stagnation of the ferrocoke gasification reaction in the fusion layer when ferrocoke is mixed with ore and used in a blast furnace. It is to provide a blast furnace operating method using coke.
  • the features of the present invention for solving such problems are as follows. (1) In a blast furnace operation method in which a coke layer and an ore layer are formed in the blast furnace, The coke layer is formed by chamber furnace coke, A method for operating a blast furnace using ferro-coke, wherein the ore layer is formed of ferro-coke, chamber furnace coke, and ore. (2) The blast furnace operation method using ferro-coke according to (1), wherein the chamber coke in the ore layer has a mixing ratio of 0.5% by mass or more with respect to the ore. . (3) The blast furnace operation using ferro-coke according to (2), wherein the chamber coke in the ore layer has a mixing ratio of 0.5 to 6% by mass with respect to the ore. Method.
  • the sum of the chamber furnace coke and the ferro-coke in the ore layer has a mixing ratio of 1.5 to 15% by mass with respect to the ore.
  • Blast furnace operation method using ferro-coke. The blast furnace operating method using ferro-coke according to any one of (1) to (7), wherein the iron content of the ferro-coke is 5 to 40% by mass.
  • the ore layer is formed by charging ferro-coke, chamber coke, ore into a blast furnace while mixing the ore, (1) to (15), Blast furnace operation method using ferro-coke.
  • the ore layer is composed of a first ore layer and a second ore layer charged in two batches, and both the first ore layer and the second ore layer include ferro-coke and chamber coke.
  • a void in the ore layer is ensured by mixing the furnace coke to improve the air permeability and facilitate the invasion of CO gas, thereby facilitating the gasification reaction of ferro-coke.
  • the reduction of the ore can be promoted, thereby reducing the reducing material ratio.
  • FIG. 1 Schematic of a longitudinal section of a blast furnace (example of the present invention). Schematic of a longitudinal section of a blast furnace (comparative example). Schematic of a longitudinal section of a blast furnace (comparative example). The graph which shows a load softening test result. The graph which shows a load softening test result. The graph which shows the relationship between the mixing amount of the chamber furnace coke and ferro-coke in an ore layer, and a sinter reduction rate. The graph which shows the mixing range of the chamber furnace coke and ferro-coke in an ore layer. The graph which shows the relationship between iron content in ferro-coke, and reaction start temperature.
  • Non-Patent Document 3 describes the air flow improvement effect of the fusion layer by mixing the furnace coke with the ore layer based on a load softening test capable of evaluating the fusion behavior of the ore.
  • the ore is a general term for one or a mixture of two or more iron-containing raw materials charged in a blast furnace such as sintered ore produced from iron ore, massive iron ore, and pellets.
  • auxiliary materials such as limestone for slag component adjustment other than an ore
  • the present inventors investigated the air permeability when ferro-coke was mixed with sintered ore using the same kind of load softening device, and compared it with the case of mixing the chamber furnace coke. The test results are shown in FIG. 5% by mass of coke (ferrocoke was considered that the coke content was 70% by mass) with respect to the sintered ore.
  • the present invention is a blast furnace operating method in which ferro-coke and chamber furnace coke are charged into a blast furnace while being mixed in the same ore layer.
  • the state in which ferro coke and blast furnace coke are mixed in the same ore layer is a state in which ferro coke and blast furnace coke exist in a dispersed manner in the entire ore layer.
  • the ore layer is composed of multiple charging batches, only ferro-coke is mixed with ore in one charging batch, and only blast furnace coke is mixed with ore in other charging batches. Does not include cases.
  • the pre-mixed ferro-coke, blast furnace coke and ore are charged using a charging device at the top of the furnace.
  • a method of charging into the furnace or a method of charging into the furnace while mixing ferro-coke, chamber furnace coke, ore can be used.
  • the chamber coke mixed with the ore layer is preferably 0.5% by mass or more based on the ore.
  • the maximum pressure loss value (relative value) and the amount of mixed coke in the ore layer in the load softening test.
  • the maximum pressure loss decreases as the mixing amount of the chamber coke is increased, but the effect of reducing the pressure loss by about 30% with respect to the case where the mixing (base) is not performed even when mixing of 0.5% by mass.
  • the mixing amount of the chamber furnace coke is sufficiently effective at 0.5 mass% or more.
  • the pressure loss reduction effect is saturated when the mixing amount of the chamber furnace coke is 5% by mass or more, and the mixing amount of the chamber furnace coke is preferably 6% by mass or less, and more preferably 5% by mass or less.
  • ferro-coke may be mixed into the ore under the same conditions as the above-mentioned chamber coke mixing conditions, but with a small amount, the effect of regenerating CO 2 in the ore layer to CO by the reaction of the above formula (a) is effective.
  • the place to express is limited.
  • both cokes mixed in the ore layer after entering the furnace interior are unevenly distributed in the actual furnace, and the CO gas regeneration effect is not sufficiently exhibited. There is a fear.
  • the amount of ferro-coke mixed with the ore is 1.0% by mass or more, which has an effect of increasing the reduction rate of the sintered ore, and the total amount of chamber coke and ferro-coke is 15% with respect to the ore.
  • the increase rate of the reduction rate starts to decrease at about%, and the increase effect is saturated at about 20% by mass. Therefore, the total amount of the chamber furnace coke and ferro-coke is preferably 20% by mass or less, more preferably 15% by mass or less with respect to the ore.
  • the above mixing conditions are organized and shown in FIG. In FIG. 7, the hatched range is a particularly preferable mixing range of chamber coke and ferro coke in the ore layer.
  • FIG. 8 shows the relationship between the iron content of ferrocoke and the reaction start temperature when ferrocoke is reacted with a CO 2 —CO mixed gas. According to FIG. 8, as the iron content in the ferro-coke increases, the effect of improving the reactivity and lowering the reaction start temperature is exhibited, but a large effect is manifested from the iron content of 5% by mass, and 40% by mass.
  • the iron content in the ferrocoke is preferably 5 to 40% by mass, more preferably 10 to 40% by mass.
  • the particle size of the chamber furnace coke mixed in the ore layer is preferably 5 to 100 mm.
  • the chamber furnace coke has a particle size of more than 20 mm and not more than 100 mm. It is preferable. More preferably, the particle size of the chamber coke is 36 mm or more and 100 mm or less.
  • a blast furnace operation test to which the method of the present invention was applied was conducted.
  • the ferro-coke used was produced by molding a mixture of coal and ore with a briquette machine, charging it into a vertical shaft furnace, and dry distillation.
  • the size of the ferro-coke is a 30 ⁇ 25 ⁇ 18 mm stamping type.
  • the iron content in ferro coke was 30 mass%.
  • a coke layer of only the chamber furnace coke was formed, and the ore layer mixed with coke (ferro coke and / or chamber furnace coke) was divided into two batches and charged.
  • three kinds of charging (test Nos. 1 to 3) were performed. Test No.
  • FIG. Test No. 2 is an operation method for comparison, in which the furnace coke and ore are mixed and charged in the first batch, and the ferro coke and ore are mixed and charged in the second batch. When viewed as a whole layer, blast furnace coke and ferro coke are mixed, but blast furnace coke and ferro coke are mixed as separate ore batches.
  • FIG. Test No. 3 is also an operation method for comparison, which is a base operation that does not use ferro-coke.
  • FIG. 1 to 3 are schematic views of a longitudinal section of the blast furnace, in which the left end of the figure is the furnace center, and the furnace wall 5 is located on the right side.
  • Table 1 shows a comparison of test conditions, blast furnace reducing material ratio, and direct reduction rate in each test.
  • the particle size of the chamber coke mixed with the ore was changed under the following six conditions (A to F).
  • the chamber coke-only layer is composed of coke having a particle size of 36 to 100 mm
  • conditions A, B, and C are cases where only coke having a particle size smaller than that of the coke forming the chamber-only coke layer is mixed.
  • D and E are coke that forms a layer of only chamber furnace coke, and when coke with a smaller particle size is added to this, F is the same quality as coke that forms a layer of only chamber furnace coke. This is the case.
  • Non-mixing chamber furnace coke in Table 1 indicates chamber furnace coke that is charged into the blast furnace without mixing with ore (coking layer coke), and “mixing chamber furnace coke” indicates chamber furnace coke that is mixed with ore. Is shown. Test No. For both Nos. 1 and 2, test no. Compared with test No. 3, the chamber coke ratio was reduced, but test No. 1 in which ferro coke and mixed chamber furnace coke were mixed in the same ore batch. In the case of 1, the reduction amount of the chamber furnace coke ratio was larger. As shown in the direct reduction rate shown in Table 1 (ratio to the total reduction amount of the reaction shown by the above formula (c) calculated from the material balance of the blast furnace), the test No. From No. 2, test no. No.
  • 1 is the result of the direct reduction rate being low, that is, the gas reduction of ore was promoted.
  • Test No. which is an example of the present invention.
  • 1 ore unit was 1562 kg / tp
  • mixing chamber furnace coke unit was 33 kg / tp
  • the mixing amount of chamber coke with respect to the ore was 2.1 mass%.
  • the ferro-coke basic unit was 101 kg / tp
  • the mixing amount with respect to the ore was 6.5% by mass
  • the total of the blast furnace coke and ferro-coke mixed with the ore was 8.6% by mass.
  • kg / tp means kg per ton of hot metal.

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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)
PCT/JP2010/063797 2009-08-10 2010-08-10 高炉操業方法 Ceased WO2011019086A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP10808267.8A EP2450459B1 (en) 2009-08-10 2010-08-10 Blast-furnace operation method
BR112012002859-6A BR112012002859B1 (pt) 2009-08-10 2010-08-10 Método para operação de alto forno
CN201080035353.5A CN102471809B (zh) 2009-08-10 2010-08-10 高炉操作方法
KR1020127004267A KR101318044B1 (ko) 2009-08-10 2010-08-10 용광로 조업 방법
US13/388,786 US8945274B2 (en) 2009-08-10 2010-08-10 Method for operating blast furnace

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2009-185412 2009-08-10
JP2009185412 2009-08-10
JP2010-175265 2010-08-04
JP2010175265A JP4793501B2 (ja) 2009-08-10 2010-08-04 フェロコークスを用いた高炉操業方法

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WO2011019086A1 true WO2011019086A1 (ja) 2011-02-17

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EP (1) EP2450459B1 (https=)
JP (1) JP4793501B2 (https=)
KR (1) KR101318044B1 (https=)
CN (1) CN102471809B (https=)
BR (1) BR112012002859B1 (https=)
WO (1) WO2011019086A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104302786A (zh) * 2012-05-18 2015-01-21 杰富意钢铁株式会社 向高炉装入原料的方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4793501B2 (ja) * 2009-08-10 2011-10-12 Ｊｆｅスチール株式会社 フェロコークスを用いた高炉操業方法
JP2011094182A (ja) * 2009-10-29 2011-05-12 Jfe Steel Corp フェロコークスを用いた高炉操業方法
JP5871062B2 (ja) * 2012-05-18 2016-03-01 Ｊｆｅスチール株式会社 高炉への原料装入方法
JP5966608B2 (ja) * 2012-05-18 2016-08-10 Ｊｆｅスチール株式会社 高炉への原料装入方法
CN104334748B (zh) * 2012-06-06 2016-10-26 杰富意钢铁株式会社 使用铁焦的高炉作业方法
JP2014224286A (ja) * 2013-05-15 2014-12-04 新日鐵住金株式会社 高炉の操業方法
CN105593380A (zh) * 2013-09-26 2016-05-18 杰富意钢铁株式会社 向高炉装入原料的方法
JP6260751B2 (ja) * 2015-10-28 2018-01-17 Ｊｆｅスチール株式会社 高炉への原料装入方法
JP6638764B2 (ja) * 2017-06-26 2020-01-29 Ｊｆｅスチール株式会社 高炉の操業方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63210207A (ja) * 1987-02-25 1988-08-31 Nkk Corp 高炉操業法
JP2006028594A (ja) * 2004-07-16 2006-02-02 Jfe Steel Kk 高炉の操業方法
JP2008106320A (ja) * 2006-10-26 2008-05-08 Jfe Steel Kk 高炉の操業方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4807103B2 (ja) * 2006-02-28 2011-11-02 Ｊｆｅスチール株式会社 高炉操業方法
JP4971815B2 (ja) * 2007-02-01 2012-07-11 株式会社神戸製鋼所 高炉操業方法
JP4793501B2 (ja) * 2009-08-10 2011-10-12 Ｊｆｅスチール株式会社 フェロコークスを用いた高炉操業方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63210207A (ja) * 1987-02-25 1988-08-31 Nkk Corp 高炉操業法
JP2006028594A (ja) * 2004-07-16 2006-02-02 Jfe Steel Kk 高炉の操業方法
JP2008106320A (ja) * 2006-10-26 2008-05-08 Jfe Steel Kk 高炉の操業方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104302786A (zh) * 2012-05-18 2015-01-21 杰富意钢铁株式会社 向高炉装入原料的方法

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KR101318044B1 (ko) 2013-10-14
JP2011058091A (ja) 2011-03-24
US8945274B2 (en) 2015-02-03
US20120205839A1 (en) 2012-08-16
BR112012002859A2 (pt) 2016-03-22
EP2450459A1 (en) 2012-05-09
EP2450459B1 (en) 2019-09-18
EP2450459A4 (en) 2017-03-22
JP4793501B2 (ja) 2011-10-12
CN102471809B (zh) 2014-07-30
KR20120037998A (ko) 2012-04-20
BR112012002859B1 (pt) 2018-06-05
CN102471809A (zh) 2012-05-23

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