Method for melting metal material in a melting plant and relative melting plant
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsBernard Villemin, Uwe Wilhelm, Thomas Narholz, Enrico Riga
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Abstract
Method for melting metal material in a melting plant comprising at least an electric furnace having at least a shell into which said metal material is introduced, and feed means to load said metal material into said shell, said method comprising at least a step of loading said metal material into said shell by means of said feed means, a melting step in which said metal material is melted, and a subsequent tapping step in which the molten metal material is tapped.
Claims16
A method for loading and melting metal material in a melting plant comprising an electric furnace having a shell into which said metal material is introduced, and feed means to load said metal material into said shell, said loading and melting method comprising:
- loading said metal material into said shell by means of said feed means,
- melting said metal material, and then
- tapping the molten metal material,
- wherein said loading comprises a first loading substep in which said metal material is loaded inside said shell to generate an initial accumulation of solid metal material inside said shell equal to between 25% and 45% of the overall quantity of molten material contained inside the electric furnace before the tapping and which will be tapped at the end of the melting cycle,
- wherein the melting comprises melting a first quantity of said metal material loaded inside said shell during the first substep, and wherein said loading further comprises a second loading substep, performed subsequent to the first substep, in which the load with which said metal material is unloaded into the shell is reduced by a control device in such a way that the load of metal material that is charged into the electric furnace in said second loading substep corresponds to the first quantity of metal material that is melted, so as to maintain, inside a metal bath that is gradually formed, a quantity of solid metal material that is equal to the quantity of solid metal material that defines said initial accumulation, and
- wherein said loading further comprises a third loading substep in which the feed load is further reduced until the loading process is stopped, to allow all the metal material present in the furnace to be completely melted, wherein the tapping step takes place when the whole solid mass has melted.
A method for loading and melting metal material in a melting plant comprising an electric furnace having a shell into which said metal material is introduced, and feed means to load said metal material into said shell, said loading and melting method comprising:
- loading said metal material into said shell by means of said feed means,
- melting said metal material, and then
- tapping the molten metal material,
- wherein said loading comprises a first loading substep in which said metal material is loaded inside said shell to generate an initial accumulation of solid metal material inside said shell equal to between 25% and 45% of the overall quantity of molten material contained inside the electric furnace before the tapping and which will be tapped at the end of the melting cycle,
- wherein the melting comprises melting a first quantity of said metal material loaded inside said shell during the first substep, and wherein said loading further comprises a second loading substep, performed subsequent to the first substep, in which the load with which said metal material is unloaded into the shell is reduced by a control device in such a way that the load of metal material that is charged into the electric furnace in said second loading substep corresponds to the first quantity of metal material that is melted, so as to maintain, inside a metal bath that is gradually formed, a quantity of solid metal material that is equal to the quantity of solid metal material that defines said initial accumulation,
- wherein said loading further comprises a third loading substep in which the feed load is further reduced until the loading process is stopped, to allow all the metal material present in the furnace to be completely melted, wherein the tapping step takes place when the whole solid mass has melted, and
- wherein the tapping comprises maintaining a level of the melted metal material in the furnace equal to between 10% and 25% of the total quantity of melted metal material in the furnace prior to the tapping.
Dependencies are inferred from the claim text.