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1.发明授权
公开(公告)号：US5067693A
公开(公告)日：1991-11-26
申请号：US492140
申请日：1990-03-13
CPC分类号： C21C5/5217 , B22D1/00 , B22D1/005 , Y02P10/216
摘要： Electric arc oven for melting scrap iron of the type comprising a vat lined with an inner coating made of refractory material which is called the sole of the oven, lateral walls, a vault capping the upper opening of the vat, openings provided in the vault through which the electrodes extend, and a tapping nozzle or eccentric tapping hole. In this oven, the sole is provided with at least one device for injecting gas to stir the molten metal. The injection device includes a low injector formed of a compact block made of dense non-porous refractory material through which extend one or a plurality of, preferably less than 50, hollow metallic tubes or slits or channels along its entire height in the direction of gaseous blowing and permitting gas to pass therethrough. The low injector is surmounted by a body of porous rammed earth whose initial thickness is 50 to 300 mm, is composed of unshaped refractory material in the form of granular particles having a diameter of at least 10 mmg, and the granulometry of the porous rammed earth has a permeability between 100 and 300 Namoperm after fritting under heat. A process of melting scrap iron using this oven is also disclosed. The gas is sent in the molten metal by first passing through the low injector then through the layer of porous rammed earth, Gas flows through at a feeding pressure of at most 10 bars and a flow rate of at least 20 Nm.sup.3 /h after fritting under heat.
摘要翻译： 用于熔化废铁的电弧炉，其包括一个内衬有由耐火材料制成的内部涂层的桶，所述内部涂层被称为烘箱的底部，侧壁，覆盖桶的上部开口的保险库，在库中设置的开口通过 电极延伸，以及攻丝喷嘴或偏心攻丝孔。 在该烘箱中，鞋底设置有至少一个用于喷射气体以搅拌熔融金属的装置。 注射装置包括由致密无孔耐火材料制成的紧凑块形成的低喷射器，通过该喷射装置沿气体方向的整个高度延伸一个或多个，优选小于50个中空的金属管或狭缝或通道 吹气并允许气体通过。 低喷射器由初始厚度为50至300mm的多孔夯土体组成，由直径至少为10mm的颗粒形状的不定形耐火材料组成，多孔夯土的粒度 在热处理后具有100至300纳米管的渗透率。 还公开了使用该烘箱熔化废铁的方法。 气体通过首先通过低喷射器然后穿过多孔夯土的一部分被送入熔融金属中，气体以最多10巴的进料压力流过，并且在熔化之后的流速为至少20Nm 3 / h 热。
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