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    Apparatus for smelting reduction of iron ore
    4.
    发明授权
    Apparatus for smelting reduction of iron ore 失效
    减少铁矿石的设备

    公开(公告)号：US5074530A

    公开(公告)日：1991-12-24

    申请号：US599679

    申请日：1990-10-17

    申请人： Katsuhiro Iwasaki ,  Kenji Takahashi ,  Shigeru Inoue ,  Haruyoshi Tanabe ,  Masahiro Kawakami ,  Osamu Terada

    发明人： Katsuhiro Iwasaki ,  Kenji Takahashi ,  Shigeru Inoue ,  Haruyoshi Tanabe ,  Masahiro Kawakami ,  Osamu Terada

    IPC分类号： C21B13/14

    CPC分类号： C21B13/14 ,  Y02P10/136

    摘要： The invention provides an apparatus for smelting reduction of iron ore which contains (1) at least one preheat and prereduction furnace which preheats and prereduces iron ore to a prereduction degree of less than 30%; (2) a smelting reduction furnace into which the preheated and prereduced iron ore, carbonaceous material and flux are charged and in which the preheated and prereduced iron ore is reduced; and (3) a top blow oxygen lance having first nozzles for decarburization and second nozzles for post-combustion, oxygen gas being blown through the first nozzles and the second nozzles into the smelting reduction furnace. At least one side tuyere is placed in a side wall of the smelting reduction furnace and at least one bottom tuyere is placed in a bottom wall of the smelting reduction furnace for blowing a stirring gas through the at least one side tuyere and the at least one bottom tuyere into the smelting reduction furnace.

    Method for smelting reduction of iron ore
    5.
    发明授权
    Method for smelting reduction of iron ore 失效

    公开(公告)号：US4995906A

    公开(公告)日：1991-02-26

    申请号：US283218

    申请日：1988-12-12

    申请人： Katsuhiro Iwasaki ,  Kenji Takahashi ,  Shigeru Inoue ,  Haruyoshi Tanabe ,  Masahiro Kawakami ,  Osamu Terada

    发明人： Katsuhiro Iwasaki ,  Kenji Takahashi ,  Shigeru Inoue ,  Haruyoshi Tanabe ,  Masahiro Kawakami ,  Osamu Terada

    IPC分类号： C21B13/14

    CPC分类号： C21B13/14 ,  Y02P10/136

    摘要： A method for smelting reduction of iron ore, comprises the steps of: introducing iron ore into a preheat and prereduction furnace and preheating and prereducing the iron ore, a prereduction degree being less than 30%; charging the iron ore, carbonaceous material and flux into a smelting reduction furnace; blowing oxygen gas, through decarburization nozzles and post-combustion nozzles placed in a top end of an oxygen lance, into the smelting reduction furnace, the top end of the oxygen lance being located so as to be between a top level and a bottom level of a slag layer; blowing a stirring gas through side tuyeres placed in a side wall and bottom tuyeres placed in a bottom wall of the smelting reduction furnace; and controlling a flow amount of the oxygen gas and the stirring gas so that an oxidation degree of an exhaust gas generated in the smelting reduction furnace ranges 0.4 to 0.9 and still a temperature of the exhaust gas ranges 300.degree. to 1300.degree. C. when the exhaust gas is introduced into the preheat and prereduction furnace. Furthermore, an apparatus for smelting reduction of iron ore comprises: a preheat and prereduction furnace; a smelting reduction furnace; a top blow oxygen lance with decarburization nozzles and post-combustion nozzles; side tuyeres and bottom tuyeres.

    Method of smelting reduction of chromium raw materials and a smelting reduction furnace thereof
    7.
    发明授权
    Method of smelting reduction of chromium raw materials and a smelting reduction furnace thereof 失效
    熔炼铬原料冶炼方法及冶炼还原炉

    公开(公告)号：US4961784A

    公开(公告)日：1990-10-09

    申请号：US360916

    申请日：1989-04-13

    申请人： Haruyoshi Tanabe ,  Masahiro Kawakami ,  Kenji Takahashi ,  Katsuhiro Iwasaki ,  Shigeru Inoue

    发明人： Haruyoshi Tanabe ,  Masahiro Kawakami ,  Kenji Takahashi ,  Katsuhiro Iwasaki ,  Shigeru Inoue

    IPC分类号： C21B13/00 ,  C21C5/00 ,  C21C5/35 ,  C22B5/10 ,  C22B34/32 ,  C22C33/04

    CPC分类号： C22B5/10 ,  C21B13/0013 ,  C21C5/005 ,  C21C5/35 ,  C22B34/32 ,  C22C33/04 ,  Y02P10/136

    摘要： The present invention relates to a method of carrying out a smelting reduction of Cr raw material as Cr ores, Cr ore pellets and so on for directly producing high Cr molten metal in a furnace provided with bottom gas blowing tuyeres, side gas blowing tuyere and a top blowing lance. An inert gas is blown from the bottom tuyere to form an upheaving part on the surface of the molten metal, and an inert gas is blown from the side tuyere against the upheaving part, whereby the molten metal is diffused into a region of the slag where Cr raw material fly so as to accelerate reduction of Cr raw materials by C in the molten metal. On the other hand, O.sub.2 for decarburization is blown from the top lance into the molten metal, and at the same time O.sub.2 for a post combustion is blown into the slag, whereby a region post combustion is formed mainly in the slag, and the slag is agitated compulsively by gas blown from the side tuyere so that heat caused by the post combustion is transferred to Cr ores at high heat transfer efficiency. A ratio of the post combustion is maintained to be more than 0.3 for securing a high post combustion.

    摘要翻译： PCT No.PCT / JP88 / 00800 Sec。 371日期：1989年4月13日 102（e）日期1989年4月13日PCT提交1988年8月11日PCT公布。 出版物WO89 / 01532 日本特开1989年2月23日。本发明涉及一种在具有底部吹气风口的炉中进行Cr原料冶炼还原的方法，该Cr原料作为Cr矿石，Cr矿石颗粒等直接生产高Cr熔融金属 侧风吹风口和顶吹喷枪。 从底部风口吹入惰性气体，在熔融金属表面形成起伏部分，从侧面风吹入惰性气体，使熔融金属扩散到炉渣的区域， Cr原料飞散，以便通过C在熔融金属中加速Cr原料的还原。 另一方面，用于脱碳的O2从顶部喷枪吹入熔融金属，同时将用于后燃烧的O2吹入炉渣中，由此主要在炉渣中形成燃烧后区域，炉渣 被从侧风口吹出的气体强制地搅动，使得由后燃烧引起的热量以高传热效率转移到Cr矿石。 为了确保高后燃烧，后燃烧的比率保持为大于0.3。

    Method for manufacturing molten metal containing Ni and Cr
    9.
    发明授权
    Method for manufacturing molten metal containing Ni and Cr 失效
    含有Ni和Cr的熔融金属的制造方法

    公开(公告)号：US5039480A

    公开(公告)日：1991-08-13

    申请号：US475675

    申请日：1990-02-06

    申请人： Haruyoshi Tanabe ,  Chihiro Taki ,  Katsuhiro Iwasaki ,  Masahiro Kawakami ,  Toshio Takaoka

    发明人： Haruyoshi Tanabe ,  Chihiro Taki ,  Katsuhiro Iwasaki ,  Masahiro Kawakami ,  Toshio Takaoka

    IPC分类号： C21B13/00 ,  C21C5/00 ,  C21C7/068 ,  C22C33/04

    CPC分类号： C22C33/04 ,  C21B13/0006 ,  C21C5/005 ,  C21C7/0685 ,  Y02P10/136

    摘要： A method for manufacturing molten metal containing Ni and Cr comprises a process of smelting and reducing Ni ore, and a process of smelting and reducing Cr ore.The process of smelting and reducing Ni ore comprises the steps of charging molten iron into a smelting reduction furnace having a top-blow oxygen lance and tuyeres for blowing stirring gas, charging Ni ore, carbonaceous material and flux into the smelting reduction furnace, blowing decarbonization oxygen and post-combustion oxygen from the top-blow oxygen lance into the smelting reduction furnace, blowing stirring gas for stirring the molten metal and slag inside the smelting reduction furnace from the tuyeres, and controlling post-combustion ratio [(H.sub.2 O+CO.sub.2)/(H.sub.2 +H.sub.2 O+CO+CO.sub.2)] at 0.3 or more.The process of smelting and reducing said Cr ore comprises charging Cr ore, carbonaceous material and flux into the smelting reduction furnace holding the molten metal containing Ni, blowing decarbonization oxygen and post-combustion oxygen from the top-blow oxygen lance into the smelting reduction furnace, blowing stirring gas for stirring the molten metal and slag inside the smelting reduction furnace from the tuyeres, and controlling post-combustion ratio [(H.sub.2 O+CO.sub.2)/(H.sub.2 +H.sub.2 O+CO+CO.sub.2)] at 0.3 or more.

    Method of producing stainless molten steel by smelting reduction
    10.
    发明授权
    Method of producing stainless molten steel by smelting reduction 失效
    通过冶炼还原生产不锈钢的方法

    公开(公告)号：US4944799A

    公开(公告)日：1990-07-31

    申请号：US362418

    申请日：1989-04-25

    申请人： Haruyoshi Tanabe ,  Masahiro Kawakami ,  Kenji Takahashi ,  Katsuhiro Iwasaki ,  Shigeru Inoue

    发明人： Haruyoshi Tanabe ,  Masahiro Kawakami ,  Kenji Takahashi ,  Katsuhiro Iwasaki ,  Shigeru Inoue

    IPC分类号： C21B13/00 ,  C21C5/00 ,  C21C5/35 ,  C21C7/068

    CPC分类号： C21C5/005 ,  C21B13/0006 ,  C21C5/35 ,  C21C7/0685 ,  Y02P10/136

    摘要： This invention relates to a method of producing stainless molten steel by a smelting reduction treatment - decarburization treatment of Cr raw materials such as Cr ores, Cr ore pellets and so on consecutively and at high treating speed in one container. In the smelting reduction, an inert gas is blown from bottom tuyeres to form an upheaving part of the molten metal on its surface and the inert gas is blown to this upheaving part. The molten metal is thereby caused to disperse into a region of the slag where the Cr materials float, so that the reduction of Cr is accelerated by C. On the other hand, decarburizing O.sub.2 is blown into the molten metal from a top lance, while O.sub.2 for a post combustion is blown into the slag, so that a post combustion region is formed mainly in the slag, and the slag is forcibly agitated by blowing the gas from the side tuyere, so that a heat generated by the post combustion is caused to transfer to Cr ores at high heat transfer efficiency, and a high post combustion is secured, as maintaining the post combustion ratio to be more than 0.3. After having completed the smelting reduction, the slag is discharged. The molten metal is agitated by blowing the decarburizing O.sub.2 diluted with the inert gas from the top lance, and blowing the inert gas from the bottom tuyeres.

    摘要翻译： PCT No.PCT / JP88 / 00910 Sec。 371日期：1989年4月25日 102（e）日期1989年4月25日PCT提交1988年9月9日PCT公布。 公开号WO89 / 02478 日本特开1989年3月23日。本发明涉及通过冶炼还原处理生产不锈钢的方法 - 在一个容器中连续和高处理速度的Cr原料如Cr矿石，Cr矿粒等进行脱碳处理 。 在熔炼还原中，从底部风嘴吹入惰性气体，在其表面形成熔融金属的上升部分，并将惰性气体吹送到该顶部。 熔融金属因此被分散到Cr材料浮渣的炉渣区域中，Cr的还原加速C.另一方面，从顶部喷枪向熔融金属吹入脱碳，同时 用于后燃烧的O2被吹入炉渣中，从而主要在炉渣中形成后燃烧区域，并且通过从侧风口吹入气体来强制搅拌炉渣，从而引起由后燃烧产生的热量 以高的传热效率转移到Cr矿石中，并且确保高的后燃烧，因为保持后燃烧比大于0.3。 在完成熔炼还原后，炉渣排出。 通过从顶部喷枪吹入用惰性气体稀释的脱碳O2并从底部风嘴吹入惰性气体来搅拌熔融金属。