• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Improvements in a process of so-called direct iron making are suggested. Particularly a method for preventing clustering in a preliminary reducing furnace and attaining an improvement of the reduction efficiency in the preliminary reducing furnace are described.
    公开号:SU1558303A3
    申请号:SU864027895
    申请日:1986-07-18
    公开日:1990-04-15
    发明作者:Секи Есикацу；Ватанабе Рио；Нисида Рейджиро；Иманиси Нобуюки
    申请人:Кабусики Кайся Кобе Сейкосе (Фирма)；
    IPC主号:
    专利说明:

    one
    (21) 4027895 / 23-02
    (22) 07/18/86
    (31) BUT 60-160974
    (32) 07/19/85
    (33) JP
    (46) 04/15/90. Bul I 14
    (71) Qabushiki Kays Kobe Seikose (JP)
    (72) Eshikatsu Seki, Rio Watanabe, Reijiro Nishida and Nobuyuki Imanisi
    (JP)
    (53) 669.421.183 (088.8) (56) Patent of the USSR V 938747, cl. From 21 to 13/00, 1980.
    (54) METHOD OF RESTORING IRON ORE TREATMENT
    l
    (57) The invention relates to metallurgy, namely to methods for directly producing iron from ore. The aim of the invention is to increase the efficiency of the process by preventing the material from sticking together and increasing the recovery rate. For this purpose, hydrocarbons are preliminarily deposited in the device 3 on dispersed iron ore, followed by heating up to the appearance on the surface of carbon, then the product is anticipated in the shaft furnace 1 associated with the melt gasifier 2. 2 Cp. silt
    Ore
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    This invention relates to metallurgy, and specifically to methods for directly producing iron from ore.
    The purpose of the invention is to increase the efficiency of the process by preventing the material from sticking together and increasing the recovery rate.
    The drawing shows a schematic
    The device for the implementation of the proposal-JQ to increase the flow of gas in the second way.
    The device comprises a furnace 1 for pre-reduction of the ore, a furnace 2 for smelting reduction (a melt-gasifier), and also a device 3 for applying a coating layer of carbon.
    The method is carried out as follows.
    High-temperature gas is fed to the 20 shaft furnace 1 from the furnace 2 for smelting reduction, the gas contains CO as the main component, as well as CO
    reduction of ore. The operating temperature in the furnace for the preliminary reduction of ore is limited by preventing sticking in the shaft furnace where pellets or pieces of ore are used. The upper limit of the operating temperature is 830 ° C or so. In the oven with pseudo
    Ng and
    H,
    35
    W
    i20, and before feeding the ore to the furnace 2, a carbon layer is applied on the surface 25 of the device 3. The cast iron is poured in advance in a fusion furnace 2 for smelting reduction and held in a molten state, carbon (oxygen) or air (30) is introduced into the carbon substance and gas 30 to supply a heat source and a reducing gas, and iron ore. The ore is covered in the device 3 with a layer of hydrocarbons, partially restored in the furnace 1 for pre-reduction of the ore, and then loaded into the furnace for reducing smelting, where the reduction is completed. The product thus obtained is cast iron.
    Hydrocarbon substance and oxygen gas are introduced into molten iron, heated to temperatures above 1500 C. Hydrocarbon substance can be heavy diesel fuel, pitch or asphalt obtained during oil refining, or coal tar or pitch obtained from coal. These substances spray on the surface of iron ore and thermal decompose at 400-600 ° C with the deposition of coke or coke residue on the surface of dispersed particles of iron ore.
    The hydrocarbon substance and the iron ore are mixed and heated, while the surface of the iron ore is covered with a layer of coke formed as a result of thermal decomposition.
    45
    the upper layer should be a temperature of 780 ° C or so. Therefore, a decrease in the temperature of the gas supplied to the furnace for pre-reduction of the ore by cooling is inevitable.
    The carbon coating layer on the original iron ore not only prevents lumps of iron ore from sintering into lumps with each other, but it also partially reacts with those contained in high-temperature gas. The temperature of the gas obtained by cracking hydrocarbons on the surface of the ore is about 400 C.
    The composition of the products of cracking carbohydrate genera on the surface of the ore particles is the following,%: H 7.6; SNE 36.2; C2H6 13.3; -C4H 12.6; C3H8 6.3; C, H6 11.0 C4H6 13.2.
    The amount of gas emitted is 10-40% by weight, based on the amount of hydrocarbon used.
    50
    55
    The amount of coal or coke is almost completely determined by the amount of unreduced iron ore contained in the pre-reduced iron that is fed to the furnace for the reduction smelting: this is usually 350-750 kg per ton of molten iron. The carbonaceous substance is gasified in a furnace for smelting reduction, resulting in the release of high-temperature gas with a predominant content of CO.
    For the purpose of heat recovery, direct post-combustion of CO and H2 in high-temperature gas, i.e. burning is allowed on the surface of the cast iron bath, i.e. heat recovery is done.
    Therefore, the gas reduction ability is reduced and it is required
    increase the gas supply
    reduction of ore. The operating temperature in the pre-ore reduction furnace is limited to preventing sticking in the shaft furnace where pellets or pieces of ore are used. The upper limit of the operating temperature is 830 ° C or so. In the oven with pseudo
    five
    0
    the upper layer should be a temperature of 780 ° C or so. Therefore, a decrease in the temperature of the gas supplied to the furnace for pre-reduction of the ore by cooling is inevitable.
    The carbon coating layer on the original iron ore not only prevents lumps of iron ore from sintering into lumps with each other, but it also partially reacts with those contained in high-temperature gas. The temperature of the gas obtained by cracking hydrocarbons on the surface of the ore is about 400 C.

    The composition of the products of cracking hydrocarbons on the surface of the ore particles is as follows,%: H 7.6; SNE 36.2; C2H6 13.3; -C4H 12.6; C3H8 6.3; C, H6 11.0; C4H6 13.2.
    The amount of gas emitted is 10-40% by weight, based on the amount of hydrocarbon used.
    0
    five
    The amount of coal or coke is almost completely determined by the amount of unreduced iron ore contained in the pre-reduced iron that is fed to the furnace for the reduction smelting: this is usually 350-750 kg per ton of molten iron. The carbonaceous substance is gasified in a smelting reduction furnace, | as a result, high-temperature gas with a predominant content of CO is released.
    The composition of the reducing gas (g,) from the melting zone is as follows,%: CO 67.6; C02 7.5; H4 17, 5; HtO 7.4.
     The gas emitted has a temperature above 1500 ° C, and by incorporating a cracked gas (about 400 ° C), the gas is cooled to a temperature acceptable for pre-reduction and without clumping. Example. 1.43 tons of iron ore are loaded) 100 kg / ton of pig iron of coal tar are loaded into the device for applying a covering layer of carbon, 640 kg / ton of pig iron of carbon material are loaded into the furnace for reducing smelting, 430 nm / ton of pig iron is fed in the same way oxygen, 1 ton of pig iron production and 1200 kg / t of pig iron gas g,.
    k
    The composition of the gas in the lower part of the furnace for pre-reduction
    ore following,%: WITH NgO 4.9.
    75.1; HЈ 20.0; 25
    According to the proposed method, the occurrence of lumps as a result of sintering due to the melting of the surface of iron ore in the furnace for the preliminary reduction of ore is prevented. The cracked gas as a result of the decomposition of carbon in iron ore has a temperature of 400 ° C and it is possible to effectively reduce the temperature of the gas from the smelting reduction furnace and help to improve its reducing ability. As a consequence, the efficiency of the pre-reduction is improved, it becomes possible to reduce the amount of carbon material fed into the smelting reduction furnace, and significantly contribute to reducing the costs associated with the method of direct production of iron from ore.
    1558303
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    权利要求:
    Claims (3)
    [1]
    1. A method of reducing treatment of iron ore, including loading pre-reducing iron ore into a furnace, solid-phase reduction in countercurrent with a hot reducing gas, unloading material from the lower part of the furnace to the melter gasifier, reducing melting of carbon-containing materials and oxygen-containing gas, feeding formed during the smelting of gases in the pre-reduction furnace, characterized in that
    In order to increase the efficiency of the process by preventing the material from sticking together and increasing the reduction rate, carbon is deposited on the surface of the iron ore prior to pre-reduction in the iron ore surface in a device for thermally decomposing carbon-containing materials and the ore coated in this way is loaded into the pre-reduction furnace, while the separated during the coating process, hydrocarbons and hydrogen are fed to the pre-reduction furnace.
    [2]
    2. Method of claim 1, characterized in that the deposition of carbon is carried out by spraying ore on the surface or mixing
    it is thermally decomposed to form a carbon coating.
    [3]
    3. Method as claimed in claim 1, wherein hydrogen and gaseous hydrocarbons released during the carbon coating process on the surface of iron ore are mixed with high-temperature gases formed during smelting and the mixture is introduced into the lower part of the pre-reduction stove.
    类似技术:
    公开号 | 公开日 | 专利标题
    CA1050765A|1979-03-20|Method for making steel
    EP0063924B2|1990-03-14|Methods for melting and refining a powdery ore containing metal oxides and apparatuses for melt-refining said ore
    RU2090622C1|1997-09-20|Method of producing iron from iron-containing materials in converter
    US6210462B1|2001-04-03|Method and apparatus for making metallic iron
    US6270553B1|2001-08-07|Direct reduction of metal oxide agglomerates
    US20020005089A1|2002-01-17|Method of and apparatus for manufacturing the metallic iron
    US4072504A|1978-02-07|Method of producing metal from metal oxides
    US3033673A|1962-05-08|Process of reducing iron oxides
    SU1558303A3|1990-04-15|Method of reduction treatment of iron ore
    JPH0762162B2|1995-07-05|Method for producing gas and molten iron in an iron bath reactor
    US3985544A|1976-10-12|Method for simultaneous combined production of electrical energy and crude iron
    US4678508A|1987-07-07|Method for fluidized bed reduction of iron ore
    US1871848A|1932-08-16|Process for producing metal sponge
    RU2005126707A|2006-02-10|IMPROVED METHOD OF Smelting for iron production
    US3938987A|1976-02-17|Process for preparing a smelter furnace charge composition
    US3167420A|1965-01-26|Production of metals or alloys from ores
    KR0169483B1|1999-01-15|Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases
    EP0976841B1|2004-09-29|Method of operating movable hearth furnace
    US3511644A|1970-05-12|Process for reducing and carburizing melting of metallic material in a rotary furnace
    KR930018038A|1993-09-21|Operation method of equipment for producing pig iron or steel spare material and apparatus for performing the same
    US3328161A|1967-06-27|Process for reducing iron ore pellets
    US3471283A|1969-10-07|Reduction of iron ore
    JPH0784624B2|1995-09-13|Method for producing molten metal from powdered ore containing metal oxide
    US1435686A|1922-11-14|Process for the direct manufacture of iron and steel
    US1841602A|1932-01-19|Treatment of iron ores and the like
    同族专利:
    公开号 | 公开日
    EP0209149A1|1987-01-21|
    AU577954B2|1988-10-06|
    DE3671247D1|1990-06-21|
    EP0209149B1|1990-05-16|
    CA1287982C|1991-08-27|
    JPH079015B2|1995-02-01|
    JPS6220809A|1987-01-29|
    CN86104943A|1987-07-15|
    CN1016704B|1992-05-20|
    AU6022186A|1987-01-22|
    IN167816B|1990-12-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS5835638B2|1979-04-11|1983-08-03|Kobe Seikosho Kk|
    CA1164388A|1980-12-22|1984-03-27|Masayasu Arikawa|Process for the production of reduced iron andthermal cracking of heavy oils|
    DE3273996D1|1981-04-28|1986-12-04|Kawasaki Steel Co|Methods for melting and refining a powdery ore containing metal oxides and apparatuses for melt-refining said ore|
    DE3318005C2|1983-05-18|1986-02-20|Klöckner CRA Technologie GmbH, 4100 Duisburg|Process for making iron|
    JPH0360884B2|1984-09-12|1991-09-18|Kobe Steel Ltd|
    DE3503493C2|1985-01-31|1987-10-22|Korf Engineering Gmbh, 4000 Duesseldorf, De|
    AU582453B2|1985-07-18|1989-03-23|Kabushiki Kaisha Kobe Seiko Sho|Melt-reductive iron making method from iron ore|FI84841C|1988-03-30|1992-01-27|Ahlstroem Oy|FOERFARANDE OCH ANORDNING FOER REDUKTION AV METALLOXIDHALTIGT MATERIAL.|
    CN1038259C|1994-07-20|1998-05-06|赵栓柱|Method for preventing sponge iron from binding in production|
    NL9500600A|1995-03-29|1996-11-01|Hoogovens Staal Bv|Device for producing liquid pig iron by direct reduction.|
    AUPN639995A0|1995-11-03|1995-11-30|Technological Resources Pty Limited|A method and an apparatus for producing metals and metal alloys|
    AUPO276496A0|1996-10-07|1996-10-31|Technological Resources Pty Limited|A method and an apparatus for producing metals and metal alloys|
    US7998454B2|2007-05-10|2011-08-16|Bio Coke Lab. Co. Ltd.|Method of producing magnesium-based hydrides and apparatus for producing magnesium-based hydrides|
    JP4206419B2|2006-09-15|2009-01-14|友宏 秋山|Ore processing method, ore processing equipment, iron making method, and iron and steel making method|
    JP5438423B2|2009-07-31|2014-03-12|株式会社神戸製鋼所|Method for producing iron ore-containing coke|
    法律状态:
    2007-09-20| REG| Reference to a code of a succession state|Ref country code: RU Ref legal event code: MM4A Effective date: 20030719 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP60160974A|JPH079015B2|1985-07-19|1985-07-19|Smelting reduction method for iron ore|
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