EP2463356A1 - Procédé de production de ferrocoke - Google Patents

Procédé de production de ferrocoke Download PDF

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Publication number
EP2463356A1
EP2463356A1 EP10817308A EP10817308A EP2463356A1 EP 2463356 A1 EP2463356 A1 EP 2463356A1 EP 10817308 A EP10817308 A EP 10817308A EP 10817308 A EP10817308 A EP 10817308A EP 2463356 A1 EP2463356 A1 EP 2463356A1
Authority
EP
European Patent Office
Prior art keywords
iron
iron ore
particle size
ore
coal
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.)
Withdrawn
Application number
EP10817308A
Other languages
German (de)
English (en)
Other versions
EP2463356A4 (fr
Inventor
Hidekazu Fujimoto
Takashi Anyashiki
Hideaki Sato
Takeshi Sato
Hiroyuki Sumi
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.)
JFE Steel Corp
Original Assignee
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
Publication of EP2463356A1 publication Critical patent/EP2463356A1/fr
Publication of EP2463356A4 publication Critical patent/EP2463356A4/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
    • 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 briquetting and carbonizing a mixture of coal and iron ore to manufacture carbon iron composite (ferrocoke).
  • coke manufactured by carbonization of coal in a chamber coke oven is charged into a blast furnace.
  • the coke in the blast furnace plays a role of a spacer for improving permeability within the blast furnace, a role as a reducing material, and a role as a heat source.
  • a technique for mixing coal with iron ore and briquetting and carbonizing the mixture to manufacture metallurgical carbon iron composite has been known.
  • a continuous process for manufacturing formed coke using a vertical carbonization furnace has recently been developed (see, for example, Non Patent Document 1). The manufacture of carbon iron composite using a similar vertical carbonization furnace is also being studied.
  • a vertical shaft furnace constructed of chamotte bricks in place of silica stone bricks is used as a carbonization furnace. Coal is briquetted into a predetermined size, is charged into the vertical shaft furnace, and is heated with a circulating heating medium gas to carbonize the formed coal, thus manufacturing formed coke. The formed coal is gradually converted into formed coke while falling through the vertical shaft furnace, is cooled with a coolant gas sent from the bottom of the vertical shaft furnace, and is discharged from the furnace.
  • Patent Document 1 describes the manufacture of formed carbon iron composite having a size of 92 cc that contains up to 75% iron ore based on the total amount. The iron ore has a particle size of 10 mm or less. Patent Document 1 states that the strength of the formed carbon iron composite containing iron ore can be maintained when the amount of iron ore having a particle size of 2 mm or more and 10 mm or less is in the range from 6% to 65% by weight of the total amount. In accordance with Patent Document 2, a mixture of carbon iron composite and sintered ore (iron ore) is charged into a blast furnace, because carbon iron composite improves the reducibility of sintered ore.
  • Non Patent Document 1 The Iron and Steel Institute of Japan, "Renzokusiki Seikei Kokusu Seize Gijutsu no Kenkyu Seika Hokokusyo", 1978-1986
  • Charging of carbon iron composite in a blast furnace results in a decrease in the amount of conventional coke.
  • the size of the carbon iron composite in the upper portion of the blast furnace be substantially the same as the size of the sintered ore (approximately 6 cc).
  • 92 cc described in Patent Document 1 is too large.
  • the upper limit of the size of iron ore to be added should be decreased.
  • a decrease in the particle size of iron ore facilitates the reduction of the iron ore.
  • the particle size of iron ore used as a raw material for carbon iron composite is very important.
  • lumps of iron ore brought in an ironworks are passed through an approximately 10-mm mesh screen.
  • Large iron ore on the screen is sent to a blast furnace, and small iron ore under the screen is sent to a sintering plant.
  • iron ore under the screen as a raw material for carbon iron composite is used to blend iron ore having a particle size of 10 mm or less with coal.
  • iron ore under the screen is directly used or crushed into a raw material having an appropriate size affects the structure of the manufacturing facilities of carbon iron composite, the cost of equipment, and the operating costs.
  • the effects of iron ore size on the qualities (strength and reduction ratio) of carbon iron composite must be investigated.
  • Carbon iron composite (having a size of 6 cc and an average particle size of 22 mm) containing iron ore having a particle size of 10 mm will have large structural defects therein and may therefore have reduced strength.
  • iron ore having a large particle size possibly has a lower reduction ratio than iron ore having a small particle size under the same carbonization conditions.
  • the present invention provides a method for manufacturing carbon iron composite, comprising mixing coal and iron ore having a maximum particle size of 1 to 2 mm to produce a briquetted material, and carbonizing the briquetted material.
  • the iron ore preferably has an iron content of 63% by mass or less.
  • the iron content is 63% by mass or less, cracking that originates from metallic iron produced by the reduction of iron ore can be prevented even in iron ore having a large particle size.
  • the iron ore has iron content of 55% to 63% by mass.
  • the iron ore has a blending ratio of 40% by mass or less relative to the total amount of coal and iron ore.
  • the blending ratio of the iron ore of 40% by mass or less allows the coking component of coal to be retained in the formed product, preventing reduction in strength.
  • the blending ratio of the iron ore preferably ranges from 1% to 40% by mass, most preferably 10% to 40% by mass.
  • the iron ore is iron ore that passes through a 1- to 2-mm mesh screen. It is desirable that the coal have a particle size of 3 mm or less. In order to increase the strength of the carbon iron composite, the particle size is more preferably 2 mm or less.
  • the producing of the briquetted material comprises mixing coal, iron ore having a maximum particle size in the range of 1 to 2 mm, and a binder to produce the briquetted material. It is desirable that the amount of the binder range from 4% to 6% by mass of the total amount of coal and iron ore.
  • the carbon iron composite has a size in the range of 0.5 to 25 cc, more preferably 5 to 8 cc. This is because the size of the carbon iron composite is desirably substantially the same as sintered ore, that is, 6 cc so as to ensure the air permeability of the blast furnace.
  • high-strength carbon iron composite can be manufactured while maintaining a target reduction ratio.
  • iron ore having a maximum particle size in the range of 1 to 2 mm is mixed with coal to manufacture the briquetted material.
  • Iron ore, for example, having a maximum particle size of 1 mm refers to crushed iron ore that passes through a 1-mm mesh screen and hereinafter referred to as a particle size of 1 mm or less (-1 mm.
  • a raw material iron ore is passed through a 1-to 2-mm mesh screen directly or after crushing, and iron ore under the screen is preferably used.
  • the briquetted material When iron ore to be used as a raw material for a briquetted material is crushed to a particle size of 0.25 mm or less, the briquetted material has low strength unless a large amount of binder is added. Thus, crushing of the iron ore to a particle size of 0.25 mm or less is unfavorable.
  • the particle size of the iron ore when the particle size of the iron ore is 2 mm or less, the reduction ratio of the carbon iron composite after the carbonization of a briquetted material can be 80% or more.
  • carbon iron composite after the carbonization of a briquetted material can have sufficiently high drum strength.
  • use of iron ore having a particle size in the range of 1 mm or less to 2 mm or less as a raw material can provide carbon iron composite having a high reduction ratio and high drum strength.
  • iron ore having an iron content of more than 63% by mass and a large particle size tends to cause cracking that originates from metallic iron produced by the reduction of the iron ore.
  • iron ore having an iron content of 63% by mass or less is preferably used.
  • the iron ore has an iron content in the range of 55% to 63% by mass.
  • the particle size of the iron ore is preferably 1 mm or less.
  • Coal to be used as a raw material for a briquetted material is preferably crushed to a particle size of 3 mm or less before use.
  • a particle size of more than 3 mm tends to result in fusion of a briquetted material during carbonization and may result in low strength of carbon iron composite after the carbonization of briquetted material.
  • the particle size of coal is more preferably 2 mm or less.
  • the coal is preferably a mixture of slightly caking coal and non-caking coal.
  • the blending ratio of iron ore is preferably 40% by mass or less of the total amount of raw materials (the total amount of coal and iron ore).
  • the blending ratio of iron ore more preferably ranges from 1% to 40% by mass, most preferably 10% to 40% by mass.
  • a coking component of coal in a briquetted material is relatively decreased, and carbon in carbon iron composite is consumed with the reduction of the iron ore. This makes the interior of the carbon iron composite more porous and markedly decreases the strength of the carbon iron composite.
  • the amount of binder ranges from 4% to 6% by mass of the total amount of coal and iron ore.
  • a briquetted material of coal and iron ore is manufactured by kneading coal, iron ore, and a binder in a high-speed mixer and using a briquetting machine.
  • the briquetted material is carbonized in a carbonization furnace or the like to manufacture carbon iron composite.
  • a manufacturing test of carbon iron composite was performed using coal and iron ore as raw materials.
  • Table 1 shows the briquetting conditions for forming a briquette of carbon iron composite raw materials.
  • a formed product 6% by mass of a binder based on the tonal mass of the raw materials coal and iron ore was added to the raw materials, which were then kneaded in a high-speed mixer at a temperature in the range of 140°C to 160°C for approximately two minutes.
  • the kneaded raw materials were formed into briquettes with a double roll briquetting machine.
  • the briquetting machine had a roll size of 650 mm ⁇ x 104 mm.
  • the peripheral speed was 0.2 m/s, and the briquetting pressure ranged from 4 to 5 t/cm.
  • the briquetted material had a size of 30 mm x 25 mm x 18 mm (6 cc) and was egg-shaped.
  • Table 2 shows the conditions for the raw materials of a formed product.
  • Coal was crushed such that all the particles had a size of 3 mm or less.
  • the coal was a mixture of slightly caking coal and non-caking coal.
  • the particle sizes of iron ore were adjusted to 0.1 mm or less (-0.1 mm), 0.25 mm or less (-0.25 mm), 0.5 mm or less (-0.5 mm), 1.0 mm or less (-1.0 mm), 1.5 mm or less (-1.5 mm), 2.0 mm or less (-2.0 mm), 2.5 mm or less (-2.5 mm), and 3.0 mm or less (-3.0 mm) by screening after crushing.
  • 30% by mass of iron ore based on the total amount of raw materials was mixed with coal.
  • Four types of iron ores having different iron contents were prepared and tested. Table 3 shows the iron content of each of the iron ores used.
  • Table 4 shows the particle size distribution of iron ore A as an example.
  • Table 4 -1 mm -1.5 mm -2 mm -0.075 15.1 (%) 11.2 6.5 0.075-0.15 10.7 8.7 5.1 0.15-0.25 11.2 9.4 5.4 0.25-0.5 26.7 21.2 14 0.5-1 35.9 33.9 22.4 1-2 0.4 15.6 44.6
  • Fig. 1 shows the relationship between the strength of the briquetted material (green strength) and the particle size of the iron ore.
  • the strength of a briquetted material was determined with a I type drum test apparatus (cylindrical with an inner diameter of 130 mm x 700 mm) by the residual rate of 16 mm or more after 30 revolutions at a rotation speed of 20 revolutions per minute. For any of ores A to D, crushing of the whole iron ore to 0.25 mm or less resulted in reduced strength of the formed product. Crushing of iron ore results in an increase in the outer surface area of particles and an increase in the amount of binder required. In the present experiment, however, the constant amount of binder was responsible for the results described above. At a particle size of iron ore in the range of 0.5 mm or less to 3 mm or less, the strength of the briquetted material did not change significantly for the same type of ore.
  • Fig. 2 shows the relationship between the reduction ratio of a briquetted material after carbonization and the particle size of iron ore.
  • the reduction ratio was substantially constant. However, the reduction ratio gradually decreased at a particle size of 0.5 mm or more.
  • the particle size of the iron ore was 3 mm or less, the reduction ratio decreased by approximately 10%. This is probably because the reduction of the central portion of the iron ore was decreased.
  • a target reduction ratio of 80% or more it is desirable that the particle size of the iron ore be 2 mm or less for any type of ore.
  • Fig. 3 shows the relationship between the strength of a briquetted material after carbonization and the particle size of iron ore.
  • the strength after carbonization was determined with a drum test apparatus by the residual rate of 6 mm or more after 150 revolutions.
  • the strength of the ore A, B, or C having an iron content of 63% by mass or less decreased when the particle size of iron ore was 0.5 mm or less. This is partly because a decrease in the particle size of iron ore made a coke portion more porous (an increase in porosity) as the reduction of the iron ore proceeded.
  • the target drum strength could be achieved when all the particle sizes of iron ore ranged from 1 mm or less to 3 mm or less.
  • the ore D having an iron content of 65.5% by mass exhibited strength reduction when the particle size of iron ore was more than 1 mm.
  • Observation of the appearance of the iron ore D after crushing showed the presence of flat pointed particles. This is probably because a large particle size of iron ore resulted in cracking that originates from metallic iron produced by the reduction of the iron ore caused by an impact in the strength test.
  • the target reduction ratio and the target strength were achieved at a particle size of iron ore in the range of 1 mm or less to 2 mm or less.
  • Fig. 4 shows the relationship between the blending ratio of iron ore and the strength after carbonization for the ores A and C.
  • the strength after carbonization gradually decreased with an increase in the blending ratio of the iron ore.
  • a significant reduction in strength was observed at a blending ratio of iron ore of more than 40% by mass. This is probably because an increase in the blending ratio of iron ore resulted in a decrease in the coking component of coal and because carbon in carbon iron composite was consumed with the reduction of the iron ore, making the interior of the carbon iron composite more porous.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Coke Industry (AREA)
EP10817308.9A 2009-09-15 2010-09-14 Procédé de production de ferrocoke Withdrawn EP2463356A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009212822 2009-09-15
JP2010201702A JP2011084734A (ja) 2009-09-15 2010-09-09 フェロコークスの製造方法
PCT/JP2010/066272 WO2011034195A1 (fr) 2009-09-15 2010-09-14 Procédé de production de ferrocoke

Publications (2)

Publication Number Publication Date
EP2463356A1 true EP2463356A1 (fr) 2012-06-13
EP2463356A4 EP2463356A4 (fr) 2014-06-11

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EP10817308.9A Withdrawn EP2463356A4 (fr) 2009-09-15 2010-09-14 Procédé de production de ferrocoke

Country Status (7)

Country Link
US (1) US20120144734A1 (fr)
EP (1) EP2463356A4 (fr)
JP (1) JP2011084734A (fr)
KR (2) KR20140130458A (fr)
CN (1) CN102498190A (fr)
BR (1) BR112012005754A2 (fr)
WO (1) WO2011034195A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103756701B (zh) * 2014-01-21 2015-11-25 河北联合大学 高反应性焦炭及其生产方法
JP6179732B2 (ja) * 2014-10-20 2017-08-16 Ｊｆｅスチール株式会社 石炭または石炭と金属酸化物との混合物の成型方法
JP6210156B2 (ja) 2015-02-06 2017-10-11 Ｊｆｅスチール株式会社 フェロコークスの製造方法
KR101982964B1 (ko) * 2015-06-24 2019-05-27 제이에프이 스틸 가부시키가이샤 페로코크스의 제조 방법
EP3315584B1 (fr) * 2015-06-24 2019-07-24 JFE Steel Corporation Procédé de production d'un produit moulé pour ferro-coke
JP6384598B2 (ja) 2016-02-24 2018-09-05 Ｊｆｅスチール株式会社 フェロコークスの製造方法
CN106635067A (zh) * 2016-11-24 2017-05-10 武汉科思瑞迪科技有限公司 一种生产铁焦的竖炉工艺
CN106916599A (zh) * 2017-02-08 2017-07-04 中冶南方工程技术有限公司 一种铁焦生产装置及方法
CN109097515B (zh) * 2018-08-31 2020-03-20 攀钢集团攀枝花钢铁研究院有限公司 利用高钛型钒钛矿烧结返矿制备铁焦的方法及其制备的铁焦
CN111944937A (zh) * 2019-05-14 2020-11-17 宝山钢铁股份有限公司 一种碳铁复合炉料的制备方法
CN110491454B (zh) * 2019-08-09 2022-11-18 中冶赛迪工程技术股份有限公司 一种高炉冶炼成本管理方法、系统及计算机可存储介质
CN113736932A (zh) * 2020-05-29 2021-12-03 宝山钢铁股份有限公司 碳铁复合炉料的制备方法

Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH0812975A (ja) * 1994-07-04 1996-01-16 Nippon Steel Corp 鉄鉱石を内装した成型コークスおよび成型コークスの製造方法および高炉操業方法

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Publication number Priority date Publication date Assignee Title
JPH0665579A (ja) * 1992-08-19 1994-03-08 Nippon Steel Corp 冶金用成型コークス製造のための成型炭の原料配合方法
CN1077602C (zh) * 1999-08-20 2002-01-09 方新贵 中温快速固结铁焦团矿的制造方法及干燥设备
JP4487564B2 (ja) * 2002-12-25 2010-06-23 Ｊｆｅスチール株式会社 フェロコークスの製造方法
JP2005053986A (ja) * 2003-08-07 2005-03-03 Nippon Steel Corp 高炉用フェロコークスの製造方法
JP4556525B2 (ja) 2004-07-16 2010-10-06 Ｊｆｅスチール株式会社 高炉の操業方法
JP2007119601A (ja) * 2005-10-28 2007-05-17 Jfe Steel Kk フェロコークスの製造方法
JP4892929B2 (ja) * 2005-11-01 2012-03-07 Ｊｆｅスチール株式会社 フェロコークスの製造方法
JP5011956B2 (ja) * 2005-11-28 2012-08-29 Ｊｆｅスチール株式会社 フェロコークスおよび焼結鉱の製造方法
JP4935133B2 (ja) * 2006-03-17 2012-05-23 Ｊｆｅスチール株式会社 フェロコークスおよび焼結鉱の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0812975A (ja) * 1994-07-04 1996-01-16 Nippon Steel Corp 鉄鉱石を内装した成型コークスおよび成型コークスの製造方法および高炉操業方法

Non-Patent Citations (1)

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Title
See also references of WO2011034195A1 *

Also Published As

Publication number Publication date
US20120144734A1 (en) 2012-06-14
KR20140130458A (ko) 2014-11-10
KR20120035946A (ko) 2012-04-16
WO2011034195A1 (fr) 2011-03-24
CN102498190A (zh) 2012-06-13
EP2463356A4 (fr) 2014-06-11
JP2011084734A (ja) 2011-04-28
BR112012005754A2 (pt) 2016-02-16

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