Patents by Inventor Bernt Rollinger

Bernt Rollinger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20060196308
    Abstract: The invention relates to a method for recovering metallic elements, especially metallic chromium, from slag containing oxides, especially chromium oxides, in an electric-arc furnace. According to said method, the slag is not reduced in a separate step after melting, but the following steps are carried out: a charge is introduced into tile electric-arc furnace, and melted, forming a molten metal and slag; said molten metal is tapped off, leaving the unreduced slag in the furnace vessel; a further charge of scrap metal including reducing agents for tile slag is added; the slag is reduced during the melting of said charge; and the slag and the molten metal are then lapped off. The inventive method can also be used in ladle metallurgy or converter metallurgy.
    Type: Application
    Filed: April 23, 2004
    Publication date: September 7, 2006
    Inventors: Bernt Rollinger, Johann Reichel
  • Patent number: 7094271
    Abstract: The invention relates to a method for producing stainless steels, in particular steels containing chromium and chromium-nickel. The method is carried out in a melting device containing a metallurgical vessel, or in a melting device (1) containing at least two vessels (2, 3) for supplying a steel-casting installation, an electric arc furnace process (1) and an air-refining process taking place alternately in the two vessels (2, 3). To improve the efficiency of a method of this type, the aim of the invention is to carry out a reversible treatment of unreduced converter slag in the electric-arc furnace mode. To achieve this, in the first treatment stage, the slag (19) with a high chromium content is melted together with the added charge, the slag is then reduced during the melting process with the silicon and carbon under favorable thermodynamic conditions of the arc, once the slag has reached a minimum temperature of 1,490┬░ C. and the slag is subsequently removed.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: August 22, 2006
    Assignee: SMS Demag AG
    Inventors: Karl Reiner G├Âtzinger, Stefan Lemke, Johann Reichel, Bernt Rollinger
  • Publication number: 20040099091
    Abstract: The invention relates to a method for producing stainless steels, in particular steels containing chromium and chromium-nickel. The method is carried out in a melting device containing a metallurgical vessel, or in a melting device (1) containing at least two vessels (2, 3) for supplying a steel-casting installation, an electric arc furnace process (1) and an air-refining process taking place alternately in the two vessels (2, 3). To improve the efficiency of a method of this type, the aim of the invention is to carry out a reversible treatment of unreduced converter slag in the electric-arc furnace mode. To achieve this, in the first treatment stage, the slag (19) with a high chromium content is melted together with the added charge, the slag is then reduced during the melting process with the silicon and carbon under favourable thermodynamic conditions of the arc, once the slag has reached a minimum temperature of 1,490° C. and the slag is subsequently removed.
    Type: Application
    Filed: July 21, 2003
    Publication date: May 27, 2004
    Inventors: Karl Reiner Gotzinger, Stefan Lembe, Johann Reichel, Bernt Rollinger
  • Publication number: 20040031583
    Abstract: The invention relates to a method, which is used in the area of secondary metallurgy (4) in its entirety with a final temperature-determining process step (4.1) such as a ladle furnace, for controlling the temperature of steel from the surface of the bath of a continuous casting ingot mold (1) up to the furnace tap (5) of a steel producing process. According to the invention, the temperature of the steel in the surface of the bath is controlled based on the equation TML=TLI+X° C. (X=5-15° C. and while respecting the same such that a jump in temperature (9) between the surface of the bath in the ingot mold (1) and a distributor (3) is detected according to the pouring rate (6) for a predetermined billet size.
    Type: Application
    Filed: April 10, 2003
    Publication date: February 19, 2004
    Inventors: Fritz-Peter Pleschiutschnigg, Lothar Parschat, Eckart Schwencke, Erwin Wosch, Bernt Rollinger, Stephan Feldhaus
  • Patent number: 5350434
    Abstract: The process for making a refined molten steel includes melting preheated solid iron sources and solid carbon sources in a melting vessel with heat generated by electric arc to form a carbon-containing molten material and then melting other preheated solid iron and carbon sources in the carbon-containing molten material by heat generated by combustion reaction in the melting vessel. In the combustion reaction oxygen is fed into the molten material through nozzles located in the melting vessel below the surface of the molten bath. The exhaust gases formed in the melting vessel are used to preheat the solid iron sources and then are burned in an afterburner to reduce pollution. An apparatus for performing the process is also described.
    Type: Grant
    Filed: May 13, 1993
    Date of Patent: September 27, 1994
    Assignee: Metallgesellschaft AG
    Inventor: Bernt Rollinger
  • Patent number: 4448402
    Abstract: A device is described for directly making liquid pig-iron from coarse iron ore. Hot sponge-iron particles are directly conveyed by a worm conveyor (17) through a communicating passage (19) from a direct-reduction blast-furnace shaft (2) into a smelter-gasifier (1), and a stream (24) of gas flows, after cooling to below 950.degree. C., in counter-current to the sponge-iron particles, from the smelter-gasifier (1) to the blast-furnace shaft (2), this gas stream having a volumetric flow-rate not more than 30 percent of the total reduction-gas flow reaching the blast-furnace shaft (FIG. 1).
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: May 15, 1984
    Assignees: Korf Engineering GmbH, Voest-Alpine AG
    Inventors: Ralph Weber, Bernt Rollinger, Rolf Hauk, Michael Nagle, Bernhard Rinner
  • Patent number: 4409023
    Abstract: A process and a device are described for directly making liquid pig-iron from coarse iron ore. Hot sponge-iron particles are directly conveyed by a worm conveyor (17) through a communicating passage (19) from a direct-reduction blast-furnace shaft (2) into a smelter-gasifier (1), and a stream (24) of gas flows, after cooling to below 950.degree. C., in counter-current to the sponge-iron particles, from the smelter-gasifier (1) to the blast-furnace shaft (2), this gas stream having a volumetric flow-rate not more than 30 percent of the total reduction-gas flow reaching the blast-furnace shaft (FIG. 1).
    Type: Grant
    Filed: September 10, 1981
    Date of Patent: October 11, 1983
    Assignees: Korf-Stahl AG, Voest-Alpine AG
    Inventors: Ralph Weber, Bernt Rollinger, Rolf Hauk, Michael Nagl, Bernhard Rinner
  • Patent number: 4392637
    Abstract: Metallurgical melting apparatus with a blow-nozzle or burner capable of swivelling in different directions. The blow-nozzle or burner comprises at least one tube. The nozzle-head (12) has a bulge, in the example described a spherical calotte (13), which is retained between two ring-seats (14 and 15) (the FIGURE).
    Type: Grant
    Filed: September 10, 1981
    Date of Patent: July 12, 1983
    Assignees: Korf-Stahl AG, Voest-Alpine AG
    Inventors: Ralph Weber, Bernt Rollinger, Michael Nagl, Bernhard Rinner
  • Patent number: 4317677
    Abstract: A process for the production of molten crude iron and reduction gas is described wherein the molten iron and gas are formed in a smelting gasifier, to which is introduced at the upper portion thereof preheated sponge iron of particle size between 3 mm and 30 mm and coal to form a fluidized bed, and an oxygen-containing gas at the lower portion thereof, and controlling the ratio of oxygen-containing gas and coal to maintain a high temperature zone in the lower portion of the gasifier and a lower temperature zone in the upper portion thereof, the oxygen-containing gas being introduced substantially immediately above the resulting melt which is formed at the bottom of the gasifier.
    Type: Grant
    Filed: October 3, 1979
    Date of Patent: March 2, 1982
    Assignee: Korf-Stahl AG.
    Inventors: Ralph Weber, Emil Elsner, Walter Maschlanka, Bernt Rollinger, Gerhard Sanders