EP0207779A2 - Direktes Reduktionsverfahren in einem Schachtofen - Google Patents

Direktes Reduktionsverfahren in einem Schachtofen Download PDF

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Publication number
EP0207779A2
EP0207779A2 EP86305084A EP86305084A EP0207779A2 EP 0207779 A2 EP0207779 A2 EP 0207779A2 EP 86305084 A EP86305084 A EP 86305084A EP 86305084 A EP86305084 A EP 86305084A EP 0207779 A2 EP0207779 A2 EP 0207779A2
Authority
EP
European Patent Office
Prior art keywords
cement
reduction
iron ore
reduction process
temperature
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.)
Granted
Application number
EP86305084A
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English (en)
French (fr)
Other versions
EP0207779A3 (en
EP0207779B1 (de
Inventor
Takehiko Ashie
Osamu Tsuchiya
Ryo Watanabe
Nobuyuki Imanishi
Mamoru Onoda
Masahiro Maekawa
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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
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Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of EP0207779A2 publication Critical patent/EP0207779A2/de
Publication of EP0207779A3 publication Critical patent/EP0207779A3/en
Application granted granted Critical
Publication of EP0207779B1 publication Critical patent/EP0207779B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/008—Use of special additives or fluxing agents
    • 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

Definitions

  • the present invention under the above described circumstances reduces or eliminates the difficulties encountered in the conventional reduction process.
  • the direct reduction process according to the present invention consists in the application of cement to the surface of iron ore material (including lump ore and pellets) before the same is charged in a direct reduction vertical furnace.
  • the reduction temperature used in the direct reduction process in a vertical furnace is determined by the temperature at which clustering occurs.
  • the clustering temperature when iron ore is used as the material, depends on such factors as grade of iron and composition of gangue, and, when pellets are used, depends on the basic components thereof, ie, calcium compounds and magnesium compounds (CaO, Ca(OH) 2 1 CaC0 3 , CaCO 3 .MgCO 3 ), etc.
  • the composition of lump ore cannot be changed artificially; it has properties and composition peculiar to its place of origin, and the clustering temperature is determined accordingly.
  • the clustering temperature is changed by the kinds and quantities of the additives and also by the firing temperatures and other factors.
  • the preferred quantity of cement for effectively preventing clustering is within the range of 0.05 to 1.0% by weight of the iron ore material. If it is less than 0.05% by weight, the clustering preventing effect is not well exhibited, and if it is more than 1.0%, the cement coating tends to suppress the reduction reaction itself. But if the cement deposit quantity is set within the range of 0.05 to 1.0% by weight, the clustering can be effectively prevented without supressing the reduction reaction, and as a result, the reduction temperature can be raised and the reduction effect can thereby be greatly improved.
  • cement there is no specific restriction as to the kinds of cement to be used. All kinds of cement, such as Portland cement, hydraulic cement, and natural cement, can be used. From the point of view of adhesive strength to the iron ore, however, normal Portland cement, high early strength Portland cement, and high strength Portland cement are preferred which have higher hydraulic property, contain large amount of the compound (3CaO.Si0 2 ) show a high degree of hydration reaction, and in addition are readily available at low cost. Also there is no restriction as to the method of applying the cement to the surface of the material ore. As the commonest examples, the methods as indicated in Figs 1 and 2 (each being a schematic process chart) may be mentioned.
  • Fig 2 shows a method in which the iron ore is burned in a rotary kiln 5 and sent onto a screen conveyer through a cooler 6 whose outlet temperature is set at about 100°C, and, on the conveyer 7, the iron ore is coated on its surface with cement solution C coming from a cement solution preparing tank 8 through a pump 9 and sprayed thereto by a sprayer 10, and the moisture is removed by evaporation caused by the heat retained in the iron ore (about 100°C).
  • 11 in the drawing denotes a cement solution recovery tank and 12 denotes a drying chamber which is provided when necessary.
  • the sample was cooled, taken out, and put in a cylinder of 120o x 700 1 (mm) and rotated at 30 rpm for five minutes. Then the sample was taken out of the cylinder and the cluster factor (ie the ratio by weight of the clusters formed by fusion welding between two or more pellets to the total weight of the pellets) was determined on the sample.
  • the cluster factor ie the ratio by weight of the clusters formed by fusion welding between two or more pellets to the total weight of the pellets
  • the reference photographs 1 - 4 show the external appearances of the pellets after the above described clustering tests, in which the reference photograph 1 shows the untreated pellet processed at the reduction temperature of 910°C and the reference photographs 2 - 4 show the cement-coated pellets processed at the reduction temperatures of 910°C, 960°C, and 1000°C, respectively. Also from these photographs, the excellent clustering preventing effects in the pellets provided with the cement coating treatment can be readily confirmed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)
EP86305084A 1985-07-02 1986-07-01 Direktes Reduktionsverfahren in einem Schachtofen Expired EP0207779B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60145641A JPS627806A (ja) 1985-07-02 1985-07-02 竪型炉を用いる直接製鉄方法
JP145641/85 1985-07-02

Publications (3)

Publication Number Publication Date
EP0207779A2 true EP0207779A2 (de) 1987-01-07
EP0207779A3 EP0207779A3 (en) 1988-12-07
EP0207779B1 EP0207779B1 (de) 1990-03-14

Family

ID=15389706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86305084A Expired EP0207779B1 (de) 1985-07-02 1986-07-01 Direktes Reduktionsverfahren in einem Schachtofen

Country Status (4)

Country Link
EP (1) EP0207779B1 (de)
JP (1) JPS627806A (de)
DE (1) DE3669533D1 (de)
MY (1) MY102683A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0495455A1 (de) * 1991-01-14 1992-07-22 HYLSA, S.A. de C.V. Verfahren und Vorrichtung zum Beschichten eisenhaltiger Teilchen für die Direktreduktion
US5372628A (en) * 1993-09-10 1994-12-13 Akzo N.V. Method for producing reducible iron-containing material having less clustering during direct reduction and products thereof
EP0643141A1 (de) * 1993-09-10 1995-03-15 Akzo Nobel N.V. Verfahren zum Herstellen reduzierbarer, eisenhaltiger Materialien mit verminderter Neigung zur Klumpenbildung bei der Direktreduktion und nach diesem Verfahren hergestellte Produkte
WO1999006600A1 (en) * 1997-08-04 1999-02-11 Bechtel Corporation Method for direct reduction and upgrading of fine-grained refractory and earthy iron ores and slags
WO2000065106A1 (de) * 1999-04-22 2000-11-02 Voest-Alpine Industrieanlagenbau Gmbh Verfahren zur herstellung von für einen direktreduktionsprozess einsetzbarem einsatzmaterial mit einer beschichtung aus hüttenschlämmen
US6355088B1 (en) 1997-08-04 2002-03-12 Bechtel Corporation Method for direct reduction and upgrading of fine-grained refractory and earthy iron ores and slags
KR100405516B1 (ko) * 1996-12-09 2004-04-14 주식회사 포스코 샤프트형 환원로에서의 장입물 정체층 해소방법
EP2069545A4 (de) * 2006-08-22 2012-01-25 Vale Do Rio Doce Co Vorrichtung zum belüften von flüssigkeit oder pulpe
WO2015068104A1 (en) * 2013-11-05 2015-05-14 Saudi Basic Industries Corporation Methods and compositions for decreasing adherence of iron oxide pellets used in direct reduction processes
US11198914B2 (en) 2013-07-29 2021-12-14 Nippon Steel Corporation Raw material for direct reduction, method of producing raw material for direct reduction, and method of producing reduced iron
CN115433796A (zh) * 2022-08-22 2022-12-06 宣化钢铁集团有限责任公司 一种气基竖炉原料涂覆设备及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1038259C (zh) * 1994-07-20 1998-05-06 赵栓柱 一种防止生产海绵铁粘结的方法
CN120476217A (zh) 2023-03-01 2025-08-12 杰富意钢铁株式会社 直接还原制铁用原料及其制造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2869850A (en) * 1954-03-17 1959-01-20 Union Carbide Corp Preparation of ore and method of heat treatment
DE1186089B (de) * 1963-01-11 1965-01-28 Metallgesellschaft Ag Verfahren zur Verhinderung des Abriebs von Pellets fuer die Eisenerzreduktion
DE2061346C3 (de) * 1970-12-12 1974-10-10 Huettenwerk Oberhausen Ag, 4200 Oberhausen Verfahren zur Vorbereitung von Eisenerzpellets zur Direktreduktion im Fest- und Wanderbett

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0495455A1 (de) * 1991-01-14 1992-07-22 HYLSA, S.A. de C.V. Verfahren und Vorrichtung zum Beschichten eisenhaltiger Teilchen für die Direktreduktion
US5181954A (en) * 1991-01-14 1993-01-26 Hylsa S.A. De C.V. Method for coating iron-bearing particles to be processed in a direct reduction process
US5372628A (en) * 1993-09-10 1994-12-13 Akzo N.V. Method for producing reducible iron-containing material having less clustering during direct reduction and products thereof
EP0643141A1 (de) * 1993-09-10 1995-03-15 Akzo Nobel N.V. Verfahren zum Herstellen reduzierbarer, eisenhaltiger Materialien mit verminderter Neigung zur Klumpenbildung bei der Direktreduktion und nach diesem Verfahren hergestellte Produkte
US5476532A (en) * 1993-09-10 1995-12-19 Akzo Nobel N.V. Method for producing reducible iron-containing material having less clustering during direct reduction and products thereof
KR100405516B1 (ko) * 1996-12-09 2004-04-14 주식회사 포스코 샤프트형 환원로에서의 장입물 정체층 해소방법
US6355088B1 (en) 1997-08-04 2002-03-12 Bechtel Corporation Method for direct reduction and upgrading of fine-grained refractory and earthy iron ores and slags
US6048382A (en) * 1997-08-04 2000-04-11 Bechtel Corporation Method for direct reduction and upgrading of fine-grained refractory and earthy iron ores and slags
WO1999006600A1 (en) * 1997-08-04 1999-02-11 Bechtel Corporation Method for direct reduction and upgrading of fine-grained refractory and earthy iron ores and slags
WO2000065106A1 (de) * 1999-04-22 2000-11-02 Voest-Alpine Industrieanlagenbau Gmbh Verfahren zur herstellung von für einen direktreduktionsprozess einsetzbarem einsatzmaterial mit einer beschichtung aus hüttenschlämmen
EP2069545A4 (de) * 2006-08-22 2012-01-25 Vale Do Rio Doce Co Vorrichtung zum belüften von flüssigkeit oder pulpe
US11198914B2 (en) 2013-07-29 2021-12-14 Nippon Steel Corporation Raw material for direct reduction, method of producing raw material for direct reduction, and method of producing reduced iron
WO2015068104A1 (en) * 2013-11-05 2015-05-14 Saudi Basic Industries Corporation Methods and compositions for decreasing adherence of iron oxide pellets used in direct reduction processes
CN105705661A (zh) * 2013-11-05 2016-06-22 沙特基础工业公司 用于减少直接还原法中所使用铁氧化物球团的黏附的方法及组合物
EA032270B1 (ru) * 2013-11-05 2019-05-31 Сауди Бэйсик Индастрис Корпорейшн Способы и композиции для уменьшения слипания окатышей оксида железа, применяемых в способах прямого восстановления
CN115433796A (zh) * 2022-08-22 2022-12-06 宣化钢铁集团有限责任公司 一种气基竖炉原料涂覆设备及方法

Also Published As

Publication number Publication date
JPS627806A (ja) 1987-01-14
JPH0582447B2 (de) 1993-11-19
EP0207779A3 (en) 1988-12-07
EP0207779B1 (de) 1990-03-14
MY102683A (en) 1992-11-30
DE3669533D1 (de) 1990-04-19

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