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公开(公告)号：US4139370A
公开(公告)日：1979-02-13
申请号：US842349
申请日：1977-10-17
CPC分类号： C21C7/0685 , C22C35/005
摘要： A ferro-alloy, namely ferrochrome or ferromanganese, is refined by being heated to at least 100.degree. C above its melting point to form a bath whereupon oxygen is blown into the melt, below the bath surface, within a protective gas envelope. The rate of oxygen blowing is so chosen that 1% of carbon is oxidized within a period not to exceed about ten minutes, preferably not more than five minutes.
摘要翻译： 铁合金，即铬铁或铁锰，通过加热至高于其熔点至少100℃而形成浴，由此氧气在熔池表面下方在保护气体封套内吹入熔体中。 吹氧速率被选择为使得1％的碳在不超过约十分钟，优选不超过五分钟的时间内被氧化。
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公开(公告)号：US4165980A
公开(公告)日：1979-08-28
申请号：US527826
申请日：1974-11-27
CPC分类号： C21C7/0685 , C21C7/068 , C22C35/005
摘要： The invention relates to a method of rapidly decarburizing a high-carbon ro-alloy with oxygen for avoiding an undesirable oxidation of the principal alloying elements, especially chromium or manganese, comprising blowing an oxidizing gas under the surface of a bath of molten ferro-alloy from one or more gas-jacketed nozzles in an amount ranging between substantially 3 and 15 m.sup.3 S.T.P. per metric ton of ferro-alloy with reduction of the carbon content of the ferro-alloy at a rate of about 0.2% to 1%. Comminuted solids, especially particles of oxides of alkaline-earth metals such as powdered lime, may be admixed with the oxidizing gas to prevent the ejection of molten metal from the bath.
摘要翻译： 本发明涉及一种用氧快速脱碳高碳铁合金的方法，以避免主要合金元素，特别是铬或锰的不期望的氧化，包括在熔融铁合金熔池表面下吹入氧化气体 来自一个或多个气体套管喷嘴，其量范围在3至15m 3 STP之间 每公吨铁合金，以约0.2％至1％的速率降低铁合金的碳含量。 粉碎的固体，特别是碱土金属的氧化物如粉末石灰的颗粒可以与氧化气体混合，以防止熔融金属从浴中喷出。
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公开(公告)号：US4130417A
公开(公告)日：1978-12-19
申请号：US850003
申请日：1977-11-09
申请人： Friedrich Breuer , Gunter Duderstadt , Werner Dresler , Rudolf Fichte , Peter Kunert , Gerd Nassauer
发明人： Friedrich Breuer , Gunter Duderstadt , Werner Dresler , Rudolf Fichte , Peter Kunert , Gerd Nassauer
CPC分类号： C22C35/005 , C21C5/34 , C21C7/0685
摘要： A hign-carbon ferro-alloy, specifically ferrochrome or ferromanganese, is carburized in a converter in which oxygen or air is blown from below into the melt together with a surrounding protective gas. With the bath preheated to a temperature somewhat higher than the melting point of the ferro-alloy, the oxygen is introduced at such a rate that its reaction with the chromium or the manganese locally superheats the bath, in a region well below the surface and spaced from the converter walls, to a temperature high enough to let the resulting oxides react endothermically with the carbon. This reaction takes place in combustion zones believed to be localized in gas bubbles formed above the injection nozzles, the oxidation of the ferrous and nonferrous constitutents occurring at the interface between the gas and the melt with formation of a very thin and highly reactive oxide skin around each bubble. Some high-melting oxides of chromium or manganese may remain after the oxygen blow but can be reduced by blowing in powdered lime, after and possibly also with the oxygen, and by the deposition of solid or liquid reducing agents on the bath surface. A minor fraction of the ferro-alloy may be added in solid form to hold down the bath temperature.
摘要翻译： 一种碳 - 碳铁合金，特别是铬铁或锰铁，在其中氧气或空气从周围吹送到熔体中的周转保护气体中脱碳。 在将浴预热到比铁合金的熔点稍高的温度下，引入氧气的速度是使其与铬或锰的反应局部过热，在远低于表面的区域中，间隔开 从转化器壁到达足够高的温度以使得到的氧化物与碳吸热反应。 该反应发生在被认为位于注射喷嘴上方形成的气泡中的燃烧区域中，在气体和熔体之间的界面处发生的铁和有色组分的氧化形成了非常薄且高反应性的氧化皮， 每个泡沫。 一些高熔点的铬或锰的氧化物可能在氧气吹过后残留，但可以在氧化石灰之后，也可能通过氧气吹入粉末石灰，以及通过在浴液表面沉积固体或液体还原剂来降低。 铁合金的一小部分可以以固体形式加入以压住浴温度。
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