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1.发明授权
公开(公告)号：US5769923A
公开(公告)日：1998-06-23
申请号：US680782
申请日：1996-07-16
CPC分类号： C21C7/0685 , C21C5/005 , C21C5/4606 , F27B3/225
摘要： Method and top blowing lance for decarburization refining chromium molten ferrous metal in which dust formation and chromium loss due to oxidation are suppressed and high productivity is achieved. Decarburization of molten ferrous metal is achieved by blowing gaseous oxygen into the molten metal in a refining furnace provided with a top blowing lance having a plurality of gas blowing nozzles at the tip of the lance. The gas blowing nozzles include at least one sub-nozzle provided at or near the lance axis and a plurality of main nozzles at an outer section of the lance. Blowing refining is carried out with oxygen flow from a plurality of the main nozzles at a flow rate higher than that from the sub-nozzle(s), when the carbon content in the molten metal is about 1 wt % or more.
摘要翻译： 用于脱碳精炼铬冶炼黑色金属的方法和顶吹喷枪，其中由于氧化而产生粉尘形成和铬损失并且实现高生产率。 熔融黑色金属的脱碳是通过在精炼炉中将气态氧吹入熔融金属而实现的，所述精炼炉具有在喷枪尖端具有多个气体吹制喷嘴的顶吹喷枪。 气体喷射喷嘴包括设置在喷枪轴线处或附近的至少一个副喷嘴和在喷枪外部的多个主喷嘴。 当熔融金属中的碳含量为约1重量％以上时，以比来自副喷嘴的流量高的流量从多个主喷嘴的氧气流进行吹炼精炼。
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公开(公告)号：US5882377A
公开(公告)日：1999-03-16
申请号：US793687
申请日：1997-03-05
申请人： Kimiharu Aida , Shuji Takeuchi , Nagayasu Bessho , Tomomichi Terabatake , Yasuo Kishimoto , Hiroshi Nishikawa , Fumio Sudo
发明人： Kimiharu Aida , Shuji Takeuchi , Nagayasu Bessho , Tomomichi Terabatake , Yasuo Kishimoto , Hiroshi Nishikawa , Fumio Sudo
CPC分类号： C21C5/005 , C21C5/35 , C22B34/32 , C21C7/0006
摘要： In this invention, the smelting reduction operation can be carried out in a high efficiency by charging a carbonaceous material in such an amount that total surface area is not less than 60 m.sup.2 per 1 ton of slag weight. Carbon substance finely particulating through thermal crumbling under a high-temperature atmosphere inside the vessel is used as the carbonaceous material, whereby it is possible to stably conduct the smelting reduction while controlling the scattering of the carbonaceous material, and also the erosion, particularly locally erosion of refractory in the smelting reduction furnace, which was a serious problem in the conventional technique, can considerably be decreased to largely prolong the service life of refractory.
摘要翻译： PCT No.PCT / JP96 / 02813 Sec。 371日期1997年3月5日 102（e）1997年3月5日PCT PCT 1996年9月27日PCT公布。 公开号WO97 / 12066 日期1997年3月4日在本发明中，通过以每1吨矿渣重量的总表面积不小于60m 2的量加入碳质材料，可以高效率地进行熔融还原操作。 作为碳质材料，使用在容器内的高温气氛下通过热破碎而微细化的碳物质，由此可以在控制碳质材料的飞散的同时稳定地进行熔炼还原，并且特别是局部侵蚀 在常规技术中是严重问题的熔融还原炉中的耐火材料可以显着降低，从而大大延长耐火材料的使用寿命。
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