Patent ID: 6558614
Filing Date: 2003-05-06
Classification: C21C,F23D,F23L,Y02E,Y02P

Abstract:
A method for producing a metal melt in a metallurgical vessel, wherein feed substances which contain metals and/or metal oxides are charged in solid and/or molten form into the metallurgical vessel, the main part of the energy necessary for the melting and/or the finish-reduction of the feed substances is applied electrically and/or by the combustion and/or the gasification of carbon-containing materials,comprising the steps of: A) supplying additional energy to the feed substances by the blowing-in, by means of one or more multi-functional lances, and the combustion of gaseous and/or liquid carbon-containing materials and oxygen-containing gas; B) cutting and partially melting the solid feed substances by the intensified blowing-in of oxygen-containing gas by means of the multi-functional lance; C) refining the melted feed substances by the intensified blowing-in of oxygen-containing gas by means of the multi-functional lance; D) alloying carbon and/or supplying additional energy to the feed substances by the blowing-in and/or burning of fine-grained and/or dust or powder-type solid carbon-containing materials by means of the multi-functional lance; E) after-burning, in a post-combustion step, waste gases from the metallurgical vessel by the blowing-in of oxygen-containing gas into the waste-gas space of the metallurgical vessel by means of the multi-functional lance, wherein the jet of the oxygen-containing gas from each multi-functional lance is skewed to the central longitudinal axis of the respective multi-functional lance and is set in a helical rotational movement; F) supplying necessary substances to the feed substances by the blowing-in of fine-grained, dust, and/or powder-type solid aggregates and/or alloying agents by means of the multi-functional lance, in order to achieve a desired composition of the metal melt; wherein a performance of each step A) through F) depends on the composition of the feed substances and on the desired composition of the metal melt, selectively in any desired combination, in succession and/or in reverse order and/or simultaneously and/or omitting the step D) and/or the step F).