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    • 5. 发明授权
    • Method of producing stainless molten steel by smelting reduction
    • 通过冶炼还原生产不锈钢的方法
    • US4944799A
    • 1990-07-31
    • US362418
    • 1989-04-25
    • Haruyoshi TanabeMasahiro KawakamiKenji TakahashiKatsuhiro IwasakiShigeru Inoue
    • Haruyoshi TanabeMasahiro KawakamiKenji TakahashiKatsuhiro IwasakiShigeru Inoue
    • C21B13/00C21C5/00C21C5/35C21C7/068
    • C21C5/005C21B13/0006C21C5/35C21C7/0685Y02P10/136
    • 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.
    • 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。
    • 6. 发明授权
    • Method of smelting reduction of chromium raw materials and a smelting
reduction furnace thereof
    • 熔炼铬原料冶炼方法及冶炼还原炉
    • US4961784A
    • 1990-10-09
    • US360916
    • 1989-04-13
    • Haruyoshi TanabeMasahiro KawakamiKenji TakahashiKatsuhiro IwasakiShigeru Inoue
    • Haruyoshi TanabeMasahiro KawakamiKenji TakahashiKatsuhiro IwasakiShigeru Inoue
    • C21B13/00C21C5/00C21C5/35C22B5/10C22B34/32C22C33/04
    • C22B5/10C21B13/0013C21C5/005C21C5/35C22B34/32C22C33/04Y02P10/136
    • 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.
    • 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。