• 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:
    The present invention relates to an electric furnace dust processing method for obtaining pig iron and condensed zinc by melting and reducing electric furnace dust composed of a magnetic component and a non-magnetic component. The object of the present invention is to select a magnetic component and a viscous component using a fluidized bed magnetic separator, Thereby reducing the zinc loss due to the reducing agent. In the present invention, the electric furnace dust composed of a magnetic component and a non-magnetic component is charged into a fluidized bed reduction reactor and reduced by a preliminary reducing furnace exhaust gas. The reduced electric furnace dust is charged into a cooler and cooled to room temperature. The nonmagnetic powder is compacted in a nonmagnetic body pelletizer to produce a nonmagnetic body pellet. The magnetic body powder is compacted in a magnetic body pelletizer together with a reducing agent and a solvent to produce a magnetic body pellet. The magnetic material pellets are charged into a preliminary reducing furnace, and are reduced using the exhaust gas of a partially combusted and elevated zinc condenser in a hot air furnace. The preliminarily reduced magnetic material pellets and nonmagnetic pellets are charged into a melting and reducing furnace, And the zinc gas contained in the exhaust gas of the melting and reducing furnace is supplied to the zinc condenser 220 Chukhayeo that produced by dust on the processing method with electrical comprising the condensation of zinc and as a base.
    公开号:KR19980052524A
    申请号:KR1019960071531
    申请日:1996-12-24
    公开日:1998-09-25
    发明作者:김행구；정선광；정우창；강홍원
    申请人:김종진；포항종합제철 주식회사；신창식；재단법인 포항산업과학연구원；
    IPC主号:
    专利说明:

    Electric furnace dust (EAF dust) treatment method
    The present invention relates to an electric furnace dust processing method for obtaining pig iron and condensed zinc by melting and reducing electric furnace dust composed of a magnetic component and a non-magnetic component, and more particularly, And more particularly, to an electric furnace dust treatment method capable of significantly reducing Zn loss due to a reducing agent by melt reduction.
    Generally, electric furnace dust (EAF dust) contains 5-25% of Zn and 15-50% of Fe although there are many differences according to electric furnace raw material condition.
    In recent years, as the specific gravity of zinc-plated steel increases in scrap iron, the Zn content in electric furnace dust is increasing.
    The Zn is 50-8-% of the content of the ZnO, the remainder zinc ferrite spinel: present in the (Zinc ferite spinel ZNO · Fe 2 O 3) , and there is also a small amount of metal Zn.
    Most of the Fe is present as Fe 2 O 3 or ferrite spinel (MO · Fe 2 O 3 , M = Zn, Mn, Ni, etc.). The dust particle size is generally 40 μm or less.
    Conventionally, electric furnace dust was charged into a melting furnace without being compacted, and melted as it was, thereby reducing ZnO in the dust with Zn gas to obtain condensed Zn. However, it has been a problem that a large amount of iron component dust is contained in the condensed Zn.
    In order to solve this problem, many researches have been carried out. Recently, as shown in FIG. 1, Sumitomo, Japan, the electric furnace dust is first compacted in the pelletizer 40, 50), ZnO is not reduced but the CO 2 / CO 2 ratio in the reducing gas is adjusted so that only the iron oxide can be selectively reduced so that the electric furnace dust pellets are reduced and cured simultaneously and then charged into the melting and reducing furnace 60 to be condensed It was reported that the dust content of iron component in Zn could be greatly reduced.
    However, according to this method, reduction of ZnO to Zn gas and metal Zn vaporization are simultaneously performed at a reduction rate of about 30-35% in the reduction furnace (50), and the loss is 10%, and the temperature or reduction rate The higher the Zn loss is expected.
    Further, in the preliminary reduction furnace (50), since the CO / CO 2 ratio should be adjusted in the reducing gas so that only the iron oxide can be selectively reduced without being reduced, the upper limit value of the ratio is limited to about 1.0 There is a problem.
    SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a method for manufacturing a magnetic bead, Thereby effectively reducing the zinc loss.
    Figure 1 is a schematic diagram of a recently developed electric furnace dust treatment method from Sumitomo Heavy Industries,
    FIG. 2 is a view showing an electric furnace dust processing method
    Description of the Related Art [0002]
    110 ... EAF Dust Bin 120 ... Fluidized bed reduction furnace
    140 ... cooler 160 ... fluidized bed magnetic separator
    170 ... non-magnetic component reservoir 180 ... magnetic component reservoir
    190A, 190B ... Pelletizer 200 ... Shaft Furnace
    210 ... Melting Furnace 220 ... Zine Condenser
    230 ... Hot Gas Generator 240 ... Reduced production
    Manufacture for 250 ...
    The present invention is characterized in that the electric furnace dust composed of a magnetic component and a non-magnetic component is preliminarily reduced in a preliminary reducing furnace and then charged into a melting reduction furnace to produce pig iron by a melting reduction furnace, A method for treating electric furnace dust including the step of condensing zinc in a zinc condenser to produce condensed zinc and supplying the exhaust gas of the zinc condenser to a preliminary reducing furnace by partial combustion and elevation of temperature in a hot air furnace, Reducing the electric furnace dust by the exhaust gas of the preliminary reducing furnace, charging the reduced electric furnace dust into the cooler, and cooling the furnace dust to room temperature; The electric furnace dust or the cooled electric furnace dust is sorted into magnetic and non-magnetic dusts by a fluidized bed magnetic separator and the non-magnetic dust is compacted in a non-magnetic pelletizer to produce a non-magnetic pellet, Producing a compacted magnetic body pellet together with a reducing agent and a solvent in a pelletizer; Charging the preliminary reduction furnace with the magnetic material pellet, reducing the partial combustion by the hot air furnace and the exhaust gas of the heated zinc condenser; Charging the preliminarily reduced magnetic body pellet and the nonmagnetic pellet into a melting and reducing furnace, and melting and reducing the iron to produce pig iron; And condensing the zinc gas contained in the molten reducing furnace exhaust gas in the zinc condenser (220) to produce condensed zinc; The present invention relates to an electric furnace dust processing method,
    Hereinafter, the present invention will be described in detail.
    FIG. 2 shows an example of preferable processes of the electric furnace dust processing method of the present invention.
    As shown in FIG. 2, the dry dust 111 in the dry furnace dust tank 110 is charged into the fluidized bed reduction furnace 120, and the exhaust gas 130 of the preliminary reducing furnace 200 Thereby forming a bubble fluidized bed.
    A preferable reduction process of the electric furnace dust 111 in the fluidized bed reduction reactor 120 is performed by mixing the converter exhaust gas or the blast furnace exhaust gas 131 with the exhaust gas 130 of the preliminary reducing furnace 200 so that Fe 3 O 4 is stabilized Reduced Fe 3 O 4 to Fe 3 O 4 while forming a bubbling fluidized bed by reducing exhaust gas formed by the oxidation of temperature and gas.
    Since reduction of Fe 3 O 4 to Fe 3 O 4 according to the present invention requires a rapid reduction rate and a relatively low temperature and a high oxidation degree of reducing gas, the by-products of steel smelting, such as blast furnace exhaust gas or converter exhaust gas 131, It can be used without processing.
    In the reduction of the electric furnace dust 111 in the fluidized bed reduction furnace 120, the reduction gas preferably has a CO / CO 2 ratio of 0.1 to 1.8 and a reduction temperature of 500 to 600 ° C.
    The reduced electric arc furnace dust is discharged from the fluidized-bed reduction reactor 120 to the cooler 140, and is cooled to a room temperature in the cooler 140.
    The cooler (140) the dust in the cooled electricity from the charged to the fluid bed magnetic separator 160, a non-magnetic material (Zn, ZnO, ZnO · SiO 2, SiO 2, CaO, MgO , etc.) and ferromagnetic (Fe 3 O 4, Ferrite spinel, etc.).
    At this time, the one having a small amount of free Fe 3 O 4 in the furnace dust in the furnace 110 is not directly passed through the fluidized bed reduction furnace 120 and the cooler 140 but directly flows into the fluidized bed magnetic separator 160 Charge.
    As a magnetic separator for sorting the particulate magnetic body and non-magnetic body of the present invention into a fluid state, a fluidized bed magnetic separator proposed in Korean Patent No. 93-012110 (1993. 7.1) is suitable.
    The non-magnetic material selected in the fluidized bed magnetic separator 160 is transferred to a non-magnetic pelletizer 190A and then compacted into non-magnetic material pellets.
    The magnetic material selected by the fluidized-bed magnetic force sorter 160 is transferred to a magnetic material pelletizer 190B, mixed with a reducing agent and a solvent, and then compacted into a magnetic material pellet.
    The magnetic material pellets in which the iron oxide is a major component is charged into the preliminary reducing furnace 200 and reduced using the exhaust gas 220 of the partially burned and elevated zinc condenser 220 in the hot air path 230.
    Thus, it is preferable that the CO / CO 2 ratio in the reducing gas in the second preliminary reduction furnace 200 operation is 0.5-10 and the reduction temperature is 750-900 ° C only.
    The preliminarily reduced magnetic material pellets and the nonmagnetic material pellets are charged into a melting and reducing furnace 210 and melted and reduced to produce pig iron and discharged together with the slag.
    The zinc melt contained in the exhaust gas is condensed in the zinc condenser (220) by the melt reduction (210) to produce condensed zinc.
    The exhaust gas 22 of the zinc condenser 220 is supplied to the hot air path 230 and is partially burned and heated to be supplied to the preliminary reducing furnace 200. In FIG. 2, the dotted line indicates the flow of gas.
    As described above, the present invention is based on the fact that zinc in the electric furnace dust exists in the Zn, ZnO, ZnO · SiO 2 state, which is a nonmagnetic substance, and ZnO · Fe 2 O 3 state, which is a ferromagnetic substance, This nonmagnetic substance is separated from the magnetic substance separately and charged into the melting reduction furnace without going through the preliminary reducing furnace, so that the loss of Zn in the reducing furnace is greatly reduced.
    Therefore, since the ZnO is not reduced in the preliminary reduction furnace 50, the selection range of the CO / CO 2 ratio in the reducing gas to be adjusted so as to selectively reduce only the iron oxide is widened.
    That is, since the reduction power of the reducing gas is increased, the preliminary reduction rate can be increased considerably, and the burden on the melting reduction furnace can be considerably reduced.
    When Fe 3 O 4 is present in a large amount in the dust, it is reduced to Fe 3 O 4 , which is a ferromagnetic material, so that the iron content of the condensed Zn layer can be reduced by directly reducing the Fe content in the non- have.
    Hereinafter, the present invention will be described in detail by way of examples.
    [Example 1]
    The electric furnace dust was separated from the magnetic body by a fluidized bed magnetic separator as disclosed in Korean Patent No. 93-012110, and then made into a spherical pellet having a particle diameter of 20 mm. The powder was placed in a vertical test tube fitted with a Cahn balance, After suspending and preliminary reduction, the Zn loss was measured in the preliminary reduction furnace by chemical analysis, and then compared with the case where the electric furnace dust was reduced and made into pellets without being separated into a magnetic material and a nonmagnetic material.
    At this time, the raw material condition and the preliminary reducing condition were as follows.
    1) Material condition:
    - The composition of the dust as a raw material, electrical: ZnO = 25.3%, Zn = 5.5%, ZnO · Fe 2 O 3 = 22.8%, Fe 3 O 4 = 2.2%, Others = 44.2%
    - particle size distribution of electric furnace dust: -2 탆 = 40.7%, 2-10 탆 = 12.5%, 10-20 탆 = 18.4%, 20-40 탆 = 11.9%, + 40 탆 = 16.5%
    2) Preliminary reduction conditions:
    - Preliminary reduction gas composition: 70% CO, 14% CO 2 , 16% N 2
    - Preliminary reducing gas flow rate: 0.9 Nm 3 / hr
    - Preliminary reduction time: 1 hour
    - Preliminary reduction temperature: 850 ℃
    As a result of this experiment, when the pellet was formed without reducing the nonmagnetic material, the loss was about 11% at a reduction rate of about 50%. However, when the nonmagnetic material was separated from the magnetic material by the fluidized bed magnetic separator, .
    [Example 2]
    In the solidified Zn at the Zn condenser for indirectly evaluating the dust content of the iron component Fe 2 O 3 group bunjinjung to electricity in a fluidized-bed reduction using the dust by the electric-rich glass Fe 2 O 3 to Fe 3 O 4 to 1, After cooling to room temperature, the non-magnetic material was separated from the magnetic material by a magnetic separator using a fluidized bed magnetic separator. The ratio of iron / zinc in the non-magnetic material was analyzed and the non-magnetic material was separated from the magnetic material without reducing it to Fe 2 O 3 . At this time, raw material conditions and primary preliminary reduction conditions were as follows.
    1) Material condition:
    - The composition of the dust as a raw material, electrical: ZnO = 20.8%, Zn = 6.1%, ZnO · Fe 3 O 4 = 18.3%, Fe 3 O 4 = 15.5%, other = 39.3%
    - particle size distribution of electric furnace dust: -2 탆 = 35.2%, 2-10 탆 = 12.9%, 10-20 탆 = 17.4%, 20-40 탆 = 15.1%, + 40 탆 = 19.4%
    2) Preliminary reduction conditions:
    - Preliminary reducing gas composition: CO 27.5%, CO 2 39%, H 2 10% H 2 O 18.5%, N 2 5%
    - Busan plate and gas flow rate: 3N㎥ / hr
    - Preliminary reduction time: 20 minutes
    - Preliminary reduction temperature: 550 ℃
    As a result of the above analysis, the Fe / O ratio in the non-magnetic body was 0.77 in the case of separation without the first preliminary reduction. However, the Fe 2 O 3 in the electric furnace was firstly reduced to Fe 3 O 4 in the fluidized bed reduction reactor, Was separated from the magnetic body, the iron / zinc content ratio in the non-magnetic body was reduced to about 0.31.
    As described above, the present invention is to remove the bunjinjung of Zn, ZnO, ZnO · Si 2 O is mainly composed of non-magnetic material and the Fe 2 O 3 as the main component of the magnetic body of ferrite spinel (Ferrite Spinel) into electrical by lines of magnetic force non-magnetic material is And the magnetic material is preliminary reduced and charged into the melting and reducing furnace in the preliminary reducing furnace, thereby remarkably reducing the loss of Zn in the preliminary reducing furnace.
    In the present invention, in the preliminary reduction furnace (50), the upper limit of the CO / CO 2 ratio in the reducing gas to be adjusted so that only the iron oxide is selectively reduced without being reduced, that is, the upper limit reducing power of the reducing gas, The reduction ratio in the fusing furnace can be reduced by significantly increasing the preliminary reduction ratio in the furnace.
    权利要求:
    Claims (5)
    [1" claim-type="Currently amended] The furnace dust consisting of a natural component and a non-natural component is preliminarily reduced in a preliminary reducing furnace in a preliminary reducing furnace, charged in a melting reduction furnace to produce pig iron by melt reduction, and zinc gas contained in the exhaust gas of the above- A step of condensing zinc in a zinc condenser to produce condensed zinc and a step of supplying the exhaust gas of the zinc condenser to the preliminary reducing furnace by partially burning and raising the exhaust gas in the hot air furnace,
    The electric furnace dust in the electric furnace dust tank 110 is charged into the fluidized bed reduction reactor 120 to reduce the electric furnace dust by the exhaust gas of the preliminary reducing furnace and the reduced electric furnace dust is charged into the cooler 140, ;
    The electric furnace dust in the electric furnace dust tank 110 or the cooled electric furnace dust is selected by the fluidized bed magnetic separator 160 as magnetic component dust and non-magnetic component dust so that the non-magnetic component pelletizer 190A ) To produce a nonmagnetic material pellet, the magnetic material powder is compacted in a magnetic material pelletizer (190B) together with a reducing agent and a solvent to prepare a magnetic material pellet;
    Charging the preliminary reduction furnace 200 with the magnetic material pellet and reducing the exhaust gas from the partially combusted and warmed zinc condenser 220 in the hot air path 230; Wow
    Charging the preliminarily reduced magnetic material pellets and the nonmagnetic pellets into a melting and reducing furnace 210, and melting and reducing them to produce pig iron; And
    Condensing the zinc gas contained in the molten reduction reactor off-gas in a zinc condenser (220) to produce condensed zinc;
    And an electric furnace dust processing method
    [2" claim-type="Currently amended] The method according to claim 1, wherein a converter exhaust gas or blast furnace exhaust gas is mixed with the preliminary reduction furnace exhaust gas supplied to the fluidized bed reduction reactor
    [3" claim-type="Currently amended] The method according to claim 1 or 2, wherein the CO / CO 2 ratio in the reducing gas at the reduction of the electric furnace dust in the fluidized bed reduction reactor (120) is 0.1-1.8 and the reduction temperature is 500-600 ° C
    [4" claim-type="Currently amended] The method according to claim 1 or 2, wherein the ratio of CO / CO 2 in the reducing gas when the magnetic material plat is reduced in the preliminary reducing furnace (200) is 0.5 to 10, and the reducing temperature is 500 to 600 ° C
    [5" claim-type="Currently amended] 4. The method according to claim 3, wherein the ratio of CO / CO 2 in the reducing gas at the reduction of the magnetic material pellets in the preliminary reducing furnace (200) is 0.5-10 and the reducing temperature is 500-600 ° C
    类似技术:
    公开号 | 公开日 | 专利标题
    AU744754B2|2002-03-07|Method of making iron and steel
    RU2271396C2|2006-03-10|Hearth melting furnace and method of its operation for production of iron or steel
    US6438154B2|2002-08-20|Method and apparatus for recovering metal values from liquid slag an baghouse dust of an electric arc furnace
    KR0159789B1|1999-01-15|A smelting reduction
    CA2707423C|2013-08-27|Method for producing reduced iron pellet and method for producing pig iron
    KR100470089B1|2005-02-05|Method for producing metallic iron
    US6277168B1|2001-08-21|Method for direct metal making by microwave energy
    CA1194702A|1985-10-08|Process for recovering iron and zinc from steel-making dusts
    TWI237061B|2005-08-01|Process for producing particulate iron metal
    EP0266975B1|1992-03-18|Smelting reduction
    CN100532579C|2009-08-26|Method for smelting base material of low phosphorous stainless steel by using low-grade limonite containing nickel-chromium
    KR20030055357A|2003-07-04|An apparatus and method for recycling dust and sludge containing iron ironmaking process using coal and fine ore
    KR19980040225A|1998-08-17|Method and apparatus for producing molten pig iron and molten steel pre-products
    Yokoyama et al.2012|Decrease in carbon consumption of a commercial blast furnace by using carbon composite iron ore
    US6685761B1|2004-02-03|Method for producing beneficiated titanium oxides
    CN101603140B|2011-07-20|Method for smelting nickel-containing molten iron by use of laterite ore
    AU2010274316B2|2013-02-28|Apparatus and method for producing reduced iron using alkali-containing iron production dust as the raw material
    CN1327072A|2001-12-19|Method and device for making metal iron
    CN101717854A|2010-06-02|Method for producing metallized pellet by using metallurgical roasting furnace
    CN101649366B|2011-10-05|Method and device for making iron by smelting reduction
    CN1539024A|2004-10-20|Method for direct metal making by microwave energy
    JP3033847B2|2000-04-17|Method for producing pig iron or steel and cement clinker from slag
    EA009226B1|2007-12-28|Process and apparatus for recovery of non-ferrous metals from zinc residues
    US20030233912A1|2003-12-25|Method of producing stainless steel by re-using waste material of stainless steel producing process
    US2805930A|1957-09-10|Process of producing iron from iron-oxide material
    同族专利:
    公开号 | 公开日
    KR100301993B1|2001-11-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-24|Application filed by 김종진, 포항종합제철 주식회사, 신창식, 재단법인 포항산업과학연구원
    1996-12-24|Priority to KR1019960071531A
    1998-09-25|Publication of KR19980052524A
    2001-11-22|Application granted
    2001-11-22|Publication of KR100301993B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960071531A|KR100301993B1|1996-12-24|1996-12-24|Method for treating dust in electric furnace|
    [返回顶部]