DIRECT SMELTING PROCESS WITH FULL COMBUSTION

    公开(公告)号:US20210123111A1

    公开(公告)日:2021-04-29

    申请号:US17042673

    申请日:2019-03-29

    摘要: Smelting metalliferous feed material process forming molten metal in smelting apparatus including smelt cyclone above and communicating with smelting vessel to contain molten metal and slag bath, including: partially reducing and melting feed material in smelt cyclone, allowing the molten partially reduced feed material flow downwardly into vessel, supplying oxygen-containing gas and carbonaceous material to vessel, smelting molten partially reduced feed material in molten metal and slag bath in vessel forming molten metal discharged from vessel and reaction products projected upwardly from molten bath, at least partially combusting combustible materials in reaction products in vessel space above molten bath, supplying oxygen-containing gas to smelt cyclone. Further combusting reaction products in smelt cyclone, discharging from smelt cyclone offgas including reaction products, supplying oxygen-containing gas into offgas duct upstream high temperature section combusting remaining offgas combustible materials while sufficiently hot for safe ignition and avoiding downstream burner-managed incineration.

    ROTARY HEARTH FURNACE, AND METHOD FOR PRODUCING REDUCED IRON USING ROTARY HEARTH FURNACE

    公开(公告)号:US20190301800A1

    公开(公告)日:2019-10-03

    申请号:US16315916

    申请日:2017-06-28

    IPC分类号: F27B9/16 C21B13/10 F27B9/34

    摘要: A rotary hearth furnace includes: a furnace body which surrounds a ring-like space; a hearth portion which forms a bottom portion of the ring-like space and is rotatable in the rotational direction; a gas exhaust portion which discharges an exhaust gas generated in the ring-like space to the outside of the furnace body; an introducing portion; and a flow rate regulating portion. The introducing portion is disposed upstream of the gas exhaust portion in the rotational direction and introduces a pressure regulating gas into a non-heating section of the ring-like space. The flow rate regulating portion is disposed between the introducing portion and the gas exhaust portion and regulates a flow rate of a gas by adjusting an opening area of the non-heating section.

    Device for producing partially reduced iron

    公开(公告)号:US10155997B2

    公开(公告)日:2018-12-18

    申请号:US15103386

    申请日:2014-12-11

    摘要: Provided is a device for producing partially reduced iron, with which partially reduced iron having a prescribed reduction ratio can be produced efficiently. The present invention is equipped with: CO sensors that detect the carbon monoxide concentration in an exhaust gas; an O2 sensor that detects the oxygen concentration in an exhaust gas; an exhaust gas circulation device that adjusts the circulating amount of the exhaust gas supplied to a reduction furnace main body, and an air feed device that adjusts the amount of air that being fed; and a control device that controls these devices. The control devices on the basis of the carbon monoxide concentration in the exhaust gas as detected by the CO sensor and the oxygen concentration in the exhaust gas as detected by the O2 sensor.

    METHOD FOR SMELTING SAPROLITE ORE
    5.
    发明申请

    公开(公告)号:US20180030574A1

    公开(公告)日:2018-02-01

    申请号:US15552031

    申请日:2015-12-01

    摘要: Provided is a smelting method whereby a reaction for reducing pellets, said pellet being formed by using a saprolite ore as a starting material, can be effectively conducted and thus an iron/nickel alloy having a nickel grade of, for example, 16% or greater can be obtained. The method comprises: a pellet production step (S1) for producing the pellets from the saprolite ore; and a reduction step (S2) for heating and reducing the obtained pellets in a smelting furnace. In the pellet production step (S1), at least the saprolite ore and a preset amount of a carbonaceous reducing agent are mixed together to produce the pellets. In the reduction step (S2), a hearth carbonaceous reducing agent is preliminarily spread on the hearth of the smelting furnace and the pellets produced above are placed on the hearth carbonaceous reducing agent and then subjected to a heat reduction treatment.

    REDUCED IRON PRODUCTION METHOD AND DEVICE
    6.
    发明申请

    公开(公告)号:US20180017326A1

    公开(公告)日:2018-01-18

    申请号:US15547864

    申请日:2016-01-21

    IPC分类号: F27B9/16 F27D3/10 C21B13/10

    摘要: A method and a device for charging a plurality of reduced iron raw materials into a traveling hearth reduction-melting furnace and treating the raw materials, allowing sufficient input of heat to the reduced iron raw materials on a hearth covering material to improve treatment efficiency are provided. The reduced iron raw materials are released downward from the lower surface of a ceiling of the reduction-melting furnace to be set on a hearth covering material on a hearth and reduced on the hearth covering material. The falling reduced iron raw materials are given a horizontal velocity having a direction equal to the travel direction of the hearth and being greater than the travel speed of the hearth to enable the reduced iron raw materials to roll in the same direction as the travel direction of the hearth after landing on the hearth covering material.

    Apparatus for manufacturing molten metal
    8.
    发明授权
    Apparatus for manufacturing molten metal 有权
    用于制造熔融金属的设备

    公开(公告)号:US09453678B2

    公开(公告)日:2016-09-27

    申请号:US13500790

    申请日:2010-10-08

    摘要: Disclosed is a production device of which secondary combustion efficiency can be further improved when a molten metal is produced by directly reducing and melting a metal agglomerate raw material layer in an electric heating furnace. Specifically, material charging chutes (4, 4) are disposed at either end portion (2, 2) of a furnace in the width direction of the furnace. Electrodes (5) are disposed in a central region in the furnace width direction. Secondary combustion burners (6) are disposed in an upper portion (1) of the furnace having stepped portions descending from both end portions (2, 2) in the furnace width direction to the electrodes (5). Raw material layers (12) each having a downslope inclined to lower portions of the electrodes (5) are formed in advance by charging a carbonaceous material (A) from the chutes (4, 4), and metal agglomerate raw material layers (13) are formed on the slopes of the raw material layers (12) by charging metal agglomerate raw material (B). Molten iron is produced by sequentially melting lower end portions of the metal agglomerate raw material layers (13) by arc heating at the electrodes (5). At the same time, an oxygen containing gas (C) is blown from the secondary combustion burners (6) so as to cause the combustion of a CO containing gas generated from the metal agglomerate raw material layers (13) while the metal agglomerate raw material layers (13) descend along the slopes of the raw material layers (12), and the metal agglomerate raw material layers (13) are heated by the radiant heat of the combustion.

    摘要翻译: 公开了一种通过在电加热炉中直接还原和熔融金属聚集体原料层来制造熔融金属时可以进一步提高二次燃烧效率的生产装置。 具体地说,在炉的宽度方向上的炉子的任一端部(2,2)上设置材料充填槽(4,4)。 电极(5)设置在炉宽方向的中央区域。 二次燃烧燃烧器(6)设置在炉的上部(1)中,炉的上部(1)具有从炉宽度方向上的两个端部(2,2)向电极(5)下降的阶梯部。 通过从滑槽(4,4)中填充碳质材料(A)和金属聚集体原料层(13),预先形成各自具有倾斜于电极(5)下部的下坡的原料层(12) 通过填充金属聚集体原料(B)而形成在原料层(12)的斜面上。 通过在电极(5)处通过电弧加热依次熔化金属聚集体原料层(13)的下端部来制造熔融铁。 同时,从二次燃烧燃烧器(6)吹入含氧气体(C),从而使金属聚集体原料层(13)产生的含CO气体燃烧,同时金属凝聚原料 层(13)沿着原料层(12)的斜面下降,金属聚集体原料层(13)被燃烧的辐射热加热。

    METHOD FOR PRODUCING METALLIC IRON
    9.
    发明申请
    METHOD FOR PRODUCING METALLIC IRON 审中-公开
    生产金属铁的方法

    公开(公告)号:US20150203931A1

    公开(公告)日:2015-07-23

    申请号:US14416175

    申请日:2013-08-05

    摘要: The first purpose of the present invention is to provide a method for producing metallic iron, whereby, in the production of metallic iron by heating an agglomerate, which comprises an iron oxide-containing material and a carbonaceous reductant, in a movable hearth type heating furnace, metallic iron can be efficiently collected from a reduced product containing metallic iron and a slag, said reduced product being obtained by heating the agglomerate. The method for producing metallic iron according to the first embodiment of the present invention comprises: a step for forming an agglomerate of a mixture which comprises an iron oxide-containing material and a carbonaceous reductant; a step for introducing the obtained agglomerate into a movable hearth type heating furnace and reducing the same by heating; a step for crushing a reduced product containing metallic iron and a slag, said reduced product being discharged from the movable hearth type heating furnace, using an impact crusher; and a step for selecting and collecting the metallic iron using a separator.

    摘要翻译: 本发明的第一个目的是提供一种生产金属铁的方法,其中通过在可移动的炉床式加热炉中加热包含含氧化铁的材料和含碳还原剂的附聚物来生产金属铁 可以从含有金属铁和渣的还原产物中有效地收集金属铁,所述还原产物是通过加热附聚物获得的。 根据本发明第一实施方案的金属铁的制造方法包括:形成含有含氧化铁的材料和碳质还原剂的混合物的附聚物的工序; 将获得的凝聚体引入可动炉床式加热炉中并通过加热将其还原的步骤; 用于粉碎含有金属铁和渣的还原产物的步骤,所述还原产物使用冲击式破碎机从可移动炉床式加热炉排出; 以及使用分离器选择和收集金属铁的步骤。

    Use of bimodal carbon distribution in compacts for producing metallic iron nodules
    10.
    发明授权
    Use of bimodal carbon distribution in compacts for producing metallic iron nodules 有权
    在压块中使用双峰碳分布来生产金属铁结核

    公开(公告)号:US08690988B2

    公开(公告)日:2014-04-08

    申请号:US13653186

    申请日:2012-10-16

    发明人: Iwao Iwasaki

    IPC分类号: C21B13/10 C22B1/14

    摘要: A method for use in production of metallic iron nodules comprising providing a reducible mixture into a hearth furnace for the production of metallic iron nodules, where the reducible mixture comprises a quantity of reducible iron bearing material, a quantity of first carbonaceous reducing material of a size less than about 28 mesh of an amount between about 65 percent and about 95 percent of a stoichiometric amount necessary for complete iron reduction of the reducible iron bearing material, and a quantity of second carbonaceous reducing material with an average particle size greater than average particle size of the first carbonaceous reducing material and a size between about 3 mesh and about 48 mesh of an amount between about 20 percent and about 60 percent of a stoichiometric amount of necessary for complete iron reduction of the reducible iron bearing material.

    摘要翻译: 一种用于生产金属铁结核的方法,包括将可还原的混合物提供到用于生产金属铁结核的炉底炉中,其中可还原的混合物包含一定数量的可还原铁轴承材料,一定量的第一碳质还原材料 少于约28目的量的可还原铁轴承材料的完全铁还原所需的化学计量量的约65%至约95%的量,以及平均粒度大于平均粒度的第二碳质还原材料的量 的第一碳质还原材料,并且约3目和约48目之间的尺寸为可还原铁轴承材料的完全铁还原所需的化学计量量的约20%至约60%之间的量。