[go: up one dir, main page]

WO2003018849A1 - Creuset de four a sole mobile - Google Patents

Creuset de four a sole mobile Download PDF

Info

Publication number
WO2003018849A1
WO2003018849A1 PCT/JP2002/008754 JP0208754W WO03018849A1 WO 2003018849 A1 WO2003018849 A1 WO 2003018849A1 JP 0208754 W JP0208754 W JP 0208754W WO 03018849 A1 WO03018849 A1 WO 03018849A1
Authority
WO
WIPO (PCT)
Prior art keywords
hearth
refractory
furnace
moving
iron oxide
Prior art date
Application number
PCT/JP2002/008754
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Ichikawa
Shinji Shima
Tomoaki Shibata
Original Assignee
Nippon 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 Nippon Steel Corporation filed Critical Nippon Steel Corporation
Publication of WO2003018849A1 publication Critical patent/WO2003018849A1/fr

Links

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0043—Floors, hearths
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • Heating iron oxide agglomerates containing carbon material on a moving bed that moves in the furnace •
  • This relates to a hearth used in a moving bed furnace that reduces and produces reduced iron agglomerates.
  • the present invention relates to a hearth used for a rotary hearth furnace for producing reduced iron.
  • US Patent No. 4,597,564 discloses dead hearth dolomite particles on the upper surface of the hearth of a rotary hearth furnace as a prior art relating to a hearth used in a moving hearth furnace for producing reduced iron agglomerates.
  • a hearth having a surface exposed to heat made of a refractory material comprising:
  • the thickness of the refractory material consisting of dead-burnt dolomite grains is 7.5 to 15 cm.
  • the particle size has a particle size of 100% minus 1 cm.
  • dead burnt dolomite grains are less expensive than magnetite grains, but they are not generated as waste, so they need to be purchased separately for moving bed furnaces and are expensive.
  • Japanese Patent No. 2997459 discloses a hearth in which a hearth material containing iron oxide as a main component (total iron content is 30% or more) is layered on a basic refractory of a moving floor.
  • a moving bed formed by sintering a hearth material in a reduction furnace is used, and the moving bed formed by sintering is in a non-molten state at the operating temperature of the reduction step.
  • the temperature rises to the operating temperature of 1250 to 1350 ° C sintering is completed and a hard porous hearth is formed.
  • an intermediate layer mainly composed of magnesium oxide is interposed between a basic refractory and the hearth material.
  • Magnesium oxide has a high melting point of 2800 ° C, and does not produce other refractories and low-melting substances near the operating temperature of 1300 ° C.
  • the intermediate layer mainly composed of magnesium oxide is preferably in the form of powder, granules, or lump obtained by crushing magnesia clinker.
  • An object of the present invention is to solve the above-mentioned problems of the prior art relating to a hearth used for a moving hearth furnace, and to provide a hearth using an inexpensive material that is excellent in heat resistance.
  • the present invention lays refractory waste including magnesium oxide on the upper surface of a hearth for a moving floor, thereby reducing the cost of purchasing hearth materials while ensuring heat resistance, and promoting recycling of refractory waste.
  • the gist is as follows. (1) In a hearth used for a moving bed furnace for producing reduced iron agglomerates by heating and reducing iron oxide agglomerates containing a reducing agent on a moving bed, magnesium oxide is formed on the upper surface of the hearth.
  • a moving hearth hearth characterized by laying refractory waste including it.
  • the reducing agent refers to a solid on-powder reducing agent such as a carbonaceous material, and is preferably coke pulverized powder coal which is easily available.
  • the iron oxide agglomerate is obtained by collecting and molding dust sludge containing metal oxide, and is preferably an agglomerate formed into an oval briquette using a double-hole molding machine.
  • the refractory waste refers to, for example, waste obtained by crushing and classifying used refractory used as a refractory material in processes such as pig iron making and steelmaking, and is preferably a refractory waste containing a large amount of MgO. This refractory waste is generated in large quantities as waste and does not cost much to purchase.
  • the heat-resistant layer made of iron oxide agglomerates refers to a heat-resistant layer formed by iron oxide agglomerates remaining on the hearth in the process of heating and reducing iron oxide agglomerates on a moving bed.
  • An iron oxide agglomerate containing carbon material is supplied onto a moving bed on which refractory waste mainly composed of magnesium oxide is laid on the upper surface of the hearth, and the iron oxide agglomerate is heated and reduced. During operation, some of the iron oxide agglomerates remain on the moving bed without being fully discharged by the discharge device. Since the remaining iron oxide agglomerate contained carbon, the carbon was vaporized and vaporized to form a porous agglomerate.
  • iron oxide agglomerates do not melt. No. Even if the iron oxide agglomerate is melted due to, for example, a partial increase in the furnace temperature or a partial decrease in the melting point of the iron oxide agglomerate, it contains magnesium oxide (desirably Contains more than 30% by weight) Since the melting point of the refractory waste is high, it does not pass through the refractory waste.
  • iron oxide agglomerates are once melted and re-solidified and fixed to the base refractory of the hearth, they will be on solid rock and difficult to be discharged by the discharge device.
  • high-melting refractory waste is disposed between the iron oxide agglomerate and the base refractory of the hearth, the furnace hearth will be melted even if the iron oxide agglomerate is once melted and re-solidified. It does not adhere to the basic refractory material, and is easily peeled off by the layer of refractory waste by the discharge device, making it easier to discharge.
  • FIG. 1 is an overall view of a hearth for a moving bed furnace according to the present invention as viewed from the side.
  • MgO used in the present invention - is a state diagram of FeO one Si0 2 based refractory debris.
  • M g 0 used in the 'present invention - Mel in the state diagram of CaO one Si0 2 based refractory debris.
  • MgO used in the present invention - is a state diagram of A1 2 0 3 _ Si0 2 based refractory debris.
  • FIG. 5 is a diagram showing a manufacturing process of refractory waste used in the present invention.
  • refractory waste 2 is laid on a hearth base refractory 1, and a heat-resistant layer 4 made of iron oxide agglomerate is present thereon.
  • the iron oxide agglomerate 3 is charged onto the hearth by the agglomerate charging device 6, and is heated and reduced to a reduced iron agglomerate 5 while the hearth moves.
  • the reduced iron agglomerate 5 is discharged outside the furnace by the agglomerate discharge device 7.
  • the thickness of the refractory waste 2 on the hearth is preferably 50 mm or more. If it is less than 50 mm, the iron oxide agglomerate once melted and re-solidified is exfoliated with a layer of refractory waste by a discharge device, and when discharged, the layer of refractory debris on the hearth base refractory disappears and the furnace This is because the floor foundation refractories may be exposed.
  • the particle size of the refractory waste 2 be at least 5 mm and the weight of 10 mm be at least 80%. If there are too many grains of 10 dragons or more, the iron oxide agglomerates that have dissolved and re-solidified are separated by a layer of refractory debris by the discharge device, and when discharged, the thickness of the refractory debris removed This is because it becomes thicker.
  • the melting temperature of the refractory debris for use in the present invention MgO in FIGS as an example - FeO _ Si0 2 system, MgO - CaO -Si0 2 system, MgO - A1 2 0 3 one Si0 This will be described with reference to a phase diagram of the two systems.
  • the melting point is more than 1500 ° C in most ranges when MgO is more than 30%.
  • a low melting point compound with a melting point of 1350 ° C or less may be formed.
  • refractory waste generated in iron making processes such as pig iron making and steel making is collected and separated for each material.
  • the separated refractory waste is subjected to primary crushing using a jaw crusher, and the refractory waste having a size of about 300 mm is reduced to a size of about 100 mm. After crushing, it is crushed in two stages from a size of about 100 mm to a size of about 20 mm.
  • a classification process is performed on the size of about 5 to 20 mm and the size of less than 5 mm, and the refractory waste with the size of 5 to 20 mm is used as the hearth material of the moving bed furnace.
  • Refractory waste of this size can also be used as an additive to caster refractory.
  • Refractory waste less than 5 mm in size can be recycled as a refractory raw material through drying, slag sorting and pulverization.
  • the hearth for moving floor furnaces which is excellent in heat resistance and uses an inexpensive material can be provided. Specifically, by laying refractory scraps of refractory containing magnesium oxide on the upper surface of the hearth, it is possible to reduce the cost of purchasing hearth materials while ensuring heat resistance.
  • refractory waste of refractory including magnesium oxide it is possible to reduce the disposal cost of refractory waste (such as landfill).
  • Refractory waste can be converted to hearth material only by crushing and classification, which is extremely simple.
  • iron oxide agglomerates are once melted and re-solidified, they do not adhere to the basic refractory of the hearth, and are easily separated by the discharge device and discharged easily.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Tunnel Furnaces (AREA)

Abstract

Cette invention concerne un creuset de four à sole mobile présentant une excellente résistance thermique, utilisant un matériau peu coûteux, lequel creuset est utilisé dans un four à sole mobile pour la fabrication de matériau en vrac de fer réduit, le procédé de fabrication consistant à faire chauffer et à réduire un matériau en vrac d'oxyde de fer contenant du charbon sur une sole mobile se déplaçant dans le four. Cette invention se caractérise en ce que des déchets réfractaires contenant de l'oxyde de magnésium sont couchés sur la surface supérieure du creuset, la teneur en oxyde de magnésium contenu dans les déchets réfractaires étant de préférence égale ou supérieure à 30 % en poids. Une couche thermorésistante formée sur le matériau en vrac d'oxyde de fer est formée sur la surface supérieure des déchets réfractaires.
PCT/JP2002/008754 2001-08-30 2002-08-29 Creuset de four a sole mobile WO2003018849A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001260636A JP2003073720A (ja) 2001-08-30 2001-08-30 移動床炉用炉床
JP2001-260636 2001-08-30

Publications (1)

Publication Number Publication Date
WO2003018849A1 true WO2003018849A1 (fr) 2003-03-06

Family

ID=19087809

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/008754 WO2003018849A1 (fr) 2001-08-30 2002-08-29 Creuset de four a sole mobile

Country Status (3)

Country Link
JP (1) JP2003073720A (fr)
TW (1) TW546387B (fr)
WO (1) WO2003018849A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5130214A (fr) * 1974-09-07 1976-03-15 Koa Taika Kogyo Kk
JPS5247017A (en) * 1975-10-12 1977-04-14 Daido Steel Co Ltd Manufacture of mgo refractories
US4597564A (en) * 1985-05-23 1986-07-01 The International Metals Reclamation Company, Inc. Rotary hearth
JPH10203862A (ja) * 1997-01-16 1998-08-04 Shinagawa Refract Co Ltd 高温焼成マグクロ質れんが
JPH11304369A (ja) * 1998-04-24 1999-11-05 Nippon Steel Corp 溶融金属容器の内張り耐火物の施工方法
US6254665B1 (en) * 1998-04-11 2001-07-03 Kobe Steel, Ltd. Method for producing reduced iron agglomerates
US20010032527A1 (en) * 1998-09-25 2001-10-25 Mitsubishi Heavy Industries, Ltd. Method of producing reduced iron and production facilities therefor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5130214A (fr) * 1974-09-07 1976-03-15 Koa Taika Kogyo Kk
JPS5247017A (en) * 1975-10-12 1977-04-14 Daido Steel Co Ltd Manufacture of mgo refractories
US4597564A (en) * 1985-05-23 1986-07-01 The International Metals Reclamation Company, Inc. Rotary hearth
JPH10203862A (ja) * 1997-01-16 1998-08-04 Shinagawa Refract Co Ltd 高温焼成マグクロ質れんが
US6254665B1 (en) * 1998-04-11 2001-07-03 Kobe Steel, Ltd. Method for producing reduced iron agglomerates
JPH11304369A (ja) * 1998-04-24 1999-11-05 Nippon Steel Corp 溶融金属容器の内張り耐火物の施工方法
US20010032527A1 (en) * 1998-09-25 2001-10-25 Mitsubishi Heavy Industries, Ltd. Method of producing reduced iron and production facilities therefor

Also Published As

Publication number Publication date
TW546387B (en) 2003-08-11
JP2003073720A (ja) 2003-03-12

Similar Documents

Publication Publication Date Title
CN103614562B (zh) 一种熔融炉处理钢铁厂固体废料工艺方法
JP4669189B2 (ja) 粒状金属鉄の製法
JP2004131753A (ja) 酸化チタン含有スラグの製造方法
US20100037728A1 (en) Method for reducing chromium containing raw material
CN103131816B (zh) 双基还原生产海绵铁的方法及其专用室式冶炼竖炉
KR101234388B1 (ko) 환원철의 제조 방법
JPH11504985A (ja) 鉄酸化物含有物から金属を回収する方法
JP4256645B2 (ja) 金属鉄の製法
JP2009041107A (ja) 粒状金属の製法
WO2009145348A1 (fr) Procédé de fabrication de fonte brute
JP3779009B2 (ja) 製鉄ダストからの高品位還元鉄の製造方法
JP3645818B2 (ja) 耐火物のリサイクル方法
JP4120230B2 (ja) 移動型炉床炉の操業方法
JP2006322075A (ja) 移動型炉床炉への原料等装入方法および装置
JP The effect of additives and reductants on the strength of reduced iron ore pellet
WO2003018849A1 (fr) Creuset de four a sole mobile
JP3879375B2 (ja) 移動型炉床炉への原料等装入方法
JP2014043646A (ja) 金属鉄の製造方法
WO1982001724A1 (fr) Procede permettant d'obtenir du metal a partir d'un materiau d'oxyde metallique finement granule
JP5406803B2 (ja) 粒状金属鉄の製造装置、および粒状金属鉄の製造方法
JP2010031355A (ja) 高亜鉛含有鉄鉱石を用いた粒鉄製造方法
JP2003129140A (ja) 還元用回転炉床向け成型物の製造方法
JP2015101740A (ja) 還元鉄の製造方法
JP3451901B2 (ja) 移動型炉床炉の操業方法
JP5119815B2 (ja) 移動型炉床炉の操業方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU CA CN KR US

Kind code of ref document: A1

Designated state(s): AU CA CN KR

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FR GB GR IE IT LU MC NL PT SE SK TR

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SK TR

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase