ES442030A3 - A method of melting scrap and refining metal in fusion in an electric arch oven. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A method of melting scrap and refining molten metal in an electric arc furnace having a vat provided with a mouth, a refractory lining in said vat, a removable roof to close said mouth, a melting electrode that can be displaced in return through said roof, in contact with said scrap and out of contact with it, a crucible line defining with said furnace an upper level of said molten metal, and a nozzle extending through said tub and said refractory lining and which is in bundles with the latter, and having an inner tube and a concentric outer tube defining a ring with said inner tube, said method including the operations of: a) charging said furnace with said scrap; b) melting a hole in said scrap to produce molten metal; c) activating said electrode to heat said scrap with heat from said electrode; d) blowing an oxygen carrying gas from said inner tube through said molten metal, to decarburize said molten metal while simultaneously continuing the melting of said scrap so that when said scrap has become molten metal, the amount of residual carbon in said molten metal is less than a desired, predetermined amount of carbon, thereby substantially reducing the melting and refining cycle and producing heat exothermically by the chemical combination of the carbon contained in the molten metal with the oxygen contained in the oxygen carrier gas, to facilitate the melting of said scrap; and e) refining said molten metal to the desired metallurgical composition and pouring temperature. (Machine-translation by Google Translate, not legally binding)