Method for optimizing the operating conditions of a submerged arc furnace
AssigneePaul Wurth S.A.
InventorJean-Luc Roth
Life of this patent
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Abstract
A method for producing molten metal by the reduction and melting of raw materials in a submerged arc type electric furnace includes at least one electrode, where substantial amounts of slag are generated so that the electric furnace contains a bath of molten metal covered with a thick layer of molten slag having a mass per unit area of at least 1000 kg/m2. The thick layer of molten slag is made to foam locally around the at least one electrode so as to create around the electrode a local layer of foaming slag in which the density of the slag is at least 50 per cent lower than in the rest of the electric furnace.
Claims13
A method of producing molten metal by reduction and melting of raw materials in a submerged arc electric furnace comprising at least one electrode, said method generating substantial amounts of slag, so that said electric furnace contains a bath of molten metal covered with a thick layer of molten slag having a mass per unit area of at least 1000 kg/m2, wherein said thick layer of molten slag is made to foam locally around said at least one electrode so as to create around this electrode a local layer of foaming slag in which the density of the foaming slag is at least 50 per cent lower than in the rest of said electric furnace.
A method of producing molten metal by reduction and melting of raw materials in a submerged arc electric furnace comprising at least one electrode, said method generating substantial amounts of slag, so that said electric furnace contains a bath of molten metal covered with a thick layer of molten slag having a mass per unit area of at least 1000 kg/m2, wherein:
- said thick layer of molten slag is made to foam locally around said at least one electrode by injecting a solid carbon-containing pulverized material into a lower third of said layer of molten slag so as to create around this electrode a local layer of foaming slag in which the density of the foaming slag is at least 50 per cent lower than in the rest of said electric furnace.
A method of producing molten metal by reduction and melting of raw materials in a submerged arc electric furnace comprising at least one electrode, said method generating substantial amounts of slag, so that said electric furnace contains a bath of molten metal covered with a thick layer of molten slag having a mass per unit area of at least 1000 kg/m2, wherein:
- said thick layer of molten slag is made to foam locally around said at least one electrode so as to create around this electrode a local layer of foaming slag in which the density of the foaming slag is at least 50 per cent lower then in the rest of said electric furnace;
- and
- said raw materials are added in the form of fines injected into one of the lower part of said layer of slag or said bath of molten metal.
A method of producing molten metal by reduction and melting of raw materials in a submerged arc electric furnace comprising at least one electrode, said method generating substantial amounts of slag, so that said electric furnace contains a bath of molten metal covered with a thick layer of molten slag having a mass per unit area of at least 1000 kg/m2, wherein:
- said thick layer of molten slag is made to foam locally around said at least one electrode so as to create around this electrode a local layer of foaming slag in which the density of the foaming slag is at least 50 per cent lower than in the rest of said electric furnace;
- and
- said raw materials are added in the form of pellets or bricks mainly at the centre of said submerged arc electric furnace.
Dependencies are inferred from the claim text.