EP2829619B1 - Verfahren zur herstellung eines precursor-pulvers zum sintern und precursor-pulver zum sintern - Google Patents

Verfahren zur herstellung eines precursor-pulvers zum sintern und precursor-pulver zum sintern Download PDF

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Publication number
EP2829619B1
EP2829619B1 EP13764065.2A EP13764065A EP2829619B1 EP 2829619 B1 EP2829619 B1 EP 2829619B1 EP 13764065 A EP13764065 A EP 13764065A EP 2829619 B1 EP2829619 B1 EP 2829619B1
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Prior art keywords
precursor powder
raw material
ore
particle size
sintered ore
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EP13764065.2A
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English (en)
French (fr)
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EP2829619A4 (de
EP2829619A1 (de
Inventor
Kenji Oya
Takahide Higuchi
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JFE Steel Corp
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JFE Steel Corp
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    • 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

Definitions

  • the present invention relates to a method for adjusting a precursor powder for sintered ore to be used in a blast furnace, and to a precursor powder for sintered ore produced by the method.
  • Sintered ore is generally produced as follows. Firstly, coke which is a condensation material, a CaO-containing auxiliary raw material such as limestone, a SiO 2 -containing auxiliary raw material such as nickel slag, and the like are added to and mixed with iron ore having particles with a particle size of about 10 mm or less, and the mixture is mixed and granulated in a drum mixer or the like with the addition of a proper amount of water. Thereafter, the granular raw materials for sintered ore thus obtained are charged, along with coke breeze, to a pallet of a sintering machine and a raw material layer for sintered ore is formed on the pallet. Then, the raw material layer for sintered ore is ignited with solid fuels on the surface layer part thereof.
  • coke which is a condensation material
  • a CaO-containing auxiliary raw material such as limestone
  • a SiO 2 -containing auxiliary raw material such as nickel slag, and the like
  • sinter cake is crushed to more uniformly-sized particles and those particles having a particle size above a certain level are fed to a blast furnace as sintered ore. That is, sintered ore results from agglomeration of iron ore in response to the iron ore being fused by reaction with fluxes, or slag components, such as CaO and SiO 2 .
  • air permeability is generally divided into two categories: air permeability under cold condition before sintering, which is determined by the particle size of iron ore and the like; and air permeability under hot condition during and/or after sintering, which is determined by the size of pores in sinter cake that are air passages formed by the flow of a melt.
  • the former which is determined by the particle size of iron ore and the like, is susceptible to the aforementioned variations in the quality of iron ore raw materials, which has posed, in particular, a major challenge to recent efforts to improve productivity.
  • JP 2008-019455 discloses a method for producing a half-reduced sintered ore using iron ore, carbonaceous material and auxiliary raw material as a sintering raw material.
  • the method includes a step of forming grains using part of the sintering raw material by compression-forming and making pelletized grains using the remaining of the sintering raw material.
  • the present invention has been made in view of the above situations, and an object thereof is to provide a method for adjusting a precursor powder for sintered ore to be used in a blast furnace and a precursor powder for sintered ore that are excellent in sintered ore production efficiency, despite variations in the particle size of iron ore raw materials.
  • the inventors of the present invention have made intensive studies on solutions to the aforementioned problem. As a result, the inventors discovered that for improved sintered ore production efficiency it is effective to adjust, in a precursor powder for sintered ore, the mixing ratio of the mass of particles of a predetermined shape in coke breeze to the mass of particles of a predetermined shape in an iron ore raw material within a certain range.
  • air permeability under cold condition before sintering may be provided by changing the properties of the coke breeze depending on the quality of the iron ore raw material (with variations in particle size), to provide excellent air permeability (JPU index) in a precursor powder for sintered ore (a raw material for sintered ore after granulation and pseudo-granulation) in a sintering pallet, thereby offering improved sintered ore production efficiency.
  • JPU index air permeability
  • the present invention is based on the above discoveries and the primary features thereof are as follows.
  • the present invention involves: mixing an iron ore raw material, coke breeze, and an auxiliary raw material in a drum mixer to obtain a precursor powder for sintered ore; and then charging the precursor powder to a sintering machine for sintering the precursor powder to thereby produce sintered ore to be used in a blast furnace.
  • an appropriate combination of the iron ore raw material and the coke breeze with a particular focus on the respective particle sizes, as described later, ensures high productivity at the time of sintering, namely, high air permeability (JPU index, which will be simply referred to as "JPU") of a precursor powder for sintered ore in a sintering pallet, which is given by Equation (1) below.
  • JPU index which will be simply referred to as "JPU”
  • Equation (1) Equation (1)
  • particle size is measured by a sieve classification method (JIS R6001 (1998)).
  • JIS R6001 JIS R6001 (1998).
  • examples of the iron ore raw material used in the present invention include hematite ore from South America, magnetite ore from North America, magnetite ore from South America, pisolite ore and Marra Mamba ore from Australia, and the like.
  • a mixing ratio [(C/F) ⁇ 100] of a mass (C) of particles having a particle size of 3 mm or more in the coke breeze to a mass (F) of particles having a particle size of 3 mm or more in the iron ore raw material is adjusted in the range of 2 % to 3 %. It should be noted that to determine F, the mass of the iron ore raw material is calculated excluding the mass of return ore.
  • a good JPU may be obtained by controlling the aforementioned mixing ratio [(C/F) ⁇ 100] via the following mechanism.
  • the aforementioned mixing ratio is small, i.e., less than 2, the particle size of the iron ore is considered to be larger than that of the coke breeze.
  • the particle size of the coke breeze is too small, sintering rate increases, yet a sintering molten zone becomes wider, thereby deteriorating the air permeability under hot condition.
  • the mixing ratio is large, i.e., more than 3
  • the particle size of the coke breeze is coarsened so much that formation of pseudoparticles for which the coke breeze serves as nuclear particles becomes apparent during the granulation process.
  • the auxiliary raw material is not particularly limited to a CaO-containing auxiliary raw material such as limestone, a SiO 2 -containing auxiliary raw material such as nickel slag, and the like, and may include other general, well-known auxiliary raw materials used in precursor powders for sintered ore and inevitably-incorporated impurities.
  • the drum mixer used in the present invention may be a normal drum mixer that is commonly utilized in the production of a precursor powder for sintered ore, such as a drum mixer with a cylindrical cone.
  • the sintering machine used in the present invention is preferably a bottom-suction Dwight Lloyd type sintering machine.
  • Other well-known sintering machines may also be used for producing a precursor powder for sintered ore.
  • a precursor powder for sintered ore to be used in a blast furnace that comprises an iron ore raw material, coke breeze, and an auxiliary raw material and is excellent in production efficiency. That is, a precursor powder for sintered ore may be obtained, with a mixing ratio [(C/F) ⁇ 100] of a mass (C) of particles having a particle size of 3 mm or more in the coke breeze to a mass (F) of particles having a particle size of 3 mm or more in the iron ore raw material, excluding return ore, being in the range of 2 % to 3 %, and preferably in the range of 2.2 % to 2.8 %.
  • a mixing ratio [(C/F) ⁇ 100] of a mass (C) of particles having a particle size of 3 mm or more in the coke breeze to a mass (F) of particles having a particle size of 3 mm or more in the iron ore raw material, excluding return ore being in the range of 2 % to 3 %, and preferably in
  • Precursor powders for sintered ore were adjusted under the following conditions. Then, the resulting precursor powders were fully charged to a bottom-suction Dwight Lloyd type sintering machine to produce sintered ore.
  • the inventors examined JPU during sintering of the precursor powders to identify the effect of the present invention.
  • FIG. 1 shows a relationship between the JPU and the mixing ratio [(C/F) ⁇ 100] of particles having a particle size of 3 mm or more in the coke breeze to particles having a particle size of 3 mm or more in the iron ore raw material. It can be seen from the figure that each precursor powder for sintered ore that was produced with a mixing ratio [(C/F) ⁇ 100] satisfying the conditions of the present invention exhibited a good result in terms of JPU, which was determined to be about 22 or more.
  • each precursor powder for sintered ore produced with a mixing ratio [(C/F) ⁇ 100] not satisfying the conditions of the present invention yielded a poor result in terms of JPU, which was determined to be about 19 to 21, i.e., not more than 21, as shown in FIG. 1 .
  • the milling was performed in a rod mill, a cage mill, a ball mill, and the like.
  • samples were collected from the pulverized coke breeze by a sampler provided at a belt conveyor transfer point, and dried in a dryer.
  • a Ro-tap type sieve shaker was used to measure the particle size distribution of each sample.
  • the milling conditions for the coke breeze were adjusted to change the presence ratio of particles having a particle size of 3 mm or more in the coke breeze depending on the particle size composition of the received iron ore, i.e., the presence ratio of particles having a particle size of 3 mm or more in the iron ore.
  • Table 1 shows the measurements of JPU and the mixing ratio [(C/F) ⁇ 100] of particles having a particle size of 3 mm or more in the coke breeze to particles having a particle size of 3 mm or more in the iron ore raw material (ore).
  • the mixing ratio C/F as specified in the method of the present invention may be obtained by adjusting the milling conditions for not only coke breeze, but also for coarse particles in iron ore.
  • a precursor powder for sintered ore that offers excellent sintered ore production efficiency may be obtained.
  • the present invention may also improve productivity and maintain air permeability in a blast furnace, and consequently increase sintered ore yield and sintered ore strength, thereby allowing for stable and highly efficient operation of the blast furnace.

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

Claims (4)

  1. Verfahren zum Einstellen eines Precursor-Pulvers für gesintertes Erz, mit:
    Mischen und Granulieren eines Eisenerz-Rohmaterials, Koksklein und eines Hilfsrohmaterials in einem Trommelmischer, um ein Precursor-Pulver für gesintertes Erz zu erhalten; und
    Zuführen des Precursor-Pulvers in eine Sintermaschine in der das Precursor-Pulver gesintert wird, um ein gesintertes Erz herzustellen, das in einem Hochofen genutzt werden soll,
    wobei das Mischen und Granulieren mit einem Mischverhältnis [(C/F) x 100] einer Masse (C) von Partikeln, die eine Partikelgröße von 3 mm oder mehr in dem Koksklein aufweisen zu einer Masse (F) von Partikeln, die eine Partikelgröße von 3 mm oder mehr in dem Eisenerz-Rohmaterial aufweisen, in dem Bereich von 2 % bis 3 % eingestellt wird.
  2. Verfahren zum Einstellen eines Precursor-Pulvers für gesintertes Erz nach Anspruch 1, wobei
    das Mischverhältnis [(C/F) x 100] in dem Bereich von 2,2 % bis 2,8 % eingestellt wird.
  3. Precursor-Pulver für gesintertes Erz, das in einem Hochofen verwendet werden soll, wobei das Precursor-Pulver aufweist:
    ein Eisenerz-Rohmaterial,
    Koksklein; und
    ein Hilfsrohmaterial, wobei ein Mischverhältnis [(C/F) x 100] einer Masse (C) von Partikeln, die eine Partikelgröße von 3 mm oder mehr in dem Koksklein aufweisen zu einer Masse (F) von Partikeln, die eine Partikelgröße von 3 mm oder mehr in dem Eisenerzmaterial aufweisen, in dem Bereich von 2 % bis 3 % eingestellt ist.
  4. Precursor-Pulver für gesintertes Erz nach Anspruch 3, wobei
    das Mischverhältnis [(C/F) x 100] in dem Bereich von 2,2 % bis 2,8 % eingestellt ist.
EP13764065.2A 2012-03-22 2013-03-21 Verfahren zur herstellung eines precursor-pulvers zum sintern und precursor-pulver zum sintern Active EP2829619B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012066244 2012-03-22
PCT/JP2013/001933 WO2013140809A1 (ja) 2012-03-22 2013-03-21 焼結鉱用原料粉の調整方法および焼結鉱用原料粉

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EP2829619A1 EP2829619A1 (de) 2015-01-28
EP2829619A4 EP2829619A4 (de) 2015-05-27
EP2829619B1 true EP2829619B1 (de) 2017-03-01

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US (1) US20150047466A1 (de)
EP (1) EP2829619B1 (de)
JP (1) JP5505579B2 (de)
KR (1) KR101525067B1 (de)
CN (1) CN104204242B (de)
AU (1) AU2013236699B2 (de)
BR (1) BR112014023430B1 (de)
PH (1) PH12014502031A1 (de)
TW (1) TWI471419B (de)
WO (1) WO2013140809A1 (de)

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JPS6237325A (ja) * 1985-06-27 1987-02-18 Nippon Kokan Kk <Nkk> 焼成塊成鉱およびその製造方法
JPS63149333A (ja) * 1986-12-15 1988-06-22 Nkk Corp 焼成塊成鉱用生ペレツトの粉コ−クス被覆方法
JPH089739B2 (ja) * 1989-08-23 1996-01-31 日本鋼管株式会社 焼成塊成鉱の製造方法
JPH08120350A (ja) * 1994-10-25 1996-05-14 Nippon Steel Corp 高温還元・軟化溶融性状の優れた焼結鉱の製造方法
JP3731361B2 (ja) * 1998-12-25 2006-01-05 Ｊｆｅスチール株式会社 焼結鉱の製造方法
CN1696318A (zh) * 2000-05-29 2005-11-16 杰富意钢铁株式会社 烧结用模拟粒子原料及其制造方法
JP3879408B2 (ja) * 2001-01-31 2007-02-14 Ｊｆｅスチール株式会社 焼結鉱の製造方法および焼結鉱
KR100587709B1 (ko) * 2003-03-20 2006-06-08 가부시키가이샤 고베 세이코쇼 소결광의 제조방법
JP5004421B2 (ja) * 2004-09-17 2012-08-22 Ｊｆｅスチール株式会社 焼結鉱の製造方法
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JP2008019455A (ja) * 2006-07-10 2008-01-31 Jfe Steel Kk 半還元焼結鉱の製造方法
JP5063978B2 (ja) * 2006-10-20 2012-10-31 新日本製鐵株式会社 焼結原料の造粒方法
CN101928824B (zh) * 2009-06-22 2013-05-01 鞍钢股份有限公司 降低烧结固体燃耗、提高强度的烧结矿生产方法
CN102206744B (zh) * 2010-03-29 2013-04-10 攀钢集团钢铁钒钛股份有限公司 一种烧结混合料制粒的方法

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PH12014502031B1 (en) 2014-11-24
AU2013236699A1 (en) 2014-10-09
JP5505579B2 (ja) 2014-05-28
CN104204242A (zh) 2014-12-10
KR101525067B1 (ko) 2015-06-02
TWI471419B (zh) 2015-02-01
JPWO2013140809A1 (ja) 2015-08-03
PH12014502031A1 (en) 2014-11-24
KR20140134326A (ko) 2014-11-21
EP2829619A4 (de) 2015-05-27
US20150047466A1 (en) 2015-02-19
TW201339313A (zh) 2013-10-01
CN104204242B (zh) 2016-08-24
AU2013236699B2 (en) 2015-04-09
BR112014023430B1 (pt) 2019-05-14
EP2829619A1 (de) 2015-01-28
WO2013140809A8 (ja) 2014-10-16
WO2013140809A1 (ja) 2013-09-26

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