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Abstract

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.

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First Claim