Patents Assigned to Metallgesellschaft AG
  • Patent number: 7322538
    Abstract: Slag crusher having a shaft extending through a pressure housing which shaft is provided with inlet baffle plates in a funnel-shaped arrangement, stationary cutting knives and cutting knives rotating on the shaft. The shaft is offset with respect to the vertical center line of the pressure housing, so that the crushing area is concentrated in the middle of the slag crusher. The rotating cutting knives are angularly offset on the periphery of the shaft, so that only one rotating knife and two stationary knives are in engagement at a time.
    Type: Grant
    Filed: November 26, 1998
    Date of Patent: January 29, 2008
    Assignee: Metallgesellschaft AG
    Inventors: Wolfram Gruhlke, Hans-Otto Ramm
  • Patent number: 6663696
    Abstract: Earth conductor for earthing systems of electrostatic separator, consisting of an electrically conductive core with a plastic or rubber sheath. In order to prevent the passage of liquid, the earth conductor consists of two conductor parts, the conductor parts are connected via a liquid-tight graphite piece, to which sections of the conductor parts are fixed, and the graphite piece and the sections of the conductor parts are embedded in a plastic body.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: December 16, 2003
    Assignee: Metallgesellschaft AG
    Inventors: Jürgen Miller, Jürgen Scharkowski, Hans Josef Vogt
  • Patent number: 6652267
    Abstract: The burner has at least two fuel-carrying tubes which are arranged in parallel, the distance between adjacent fuel-carrying tubes being 5 to 30 cm. Each fuel-carrying tube is surrounded by a steam-carrying tube, which at its orifice end has a supply line for oxygen-containing gas. The steam-carrying tubes are surrounded by a common first cooling chamber through which cooling liquid is passed, the first cooling chamber constituting an annular chamber and extending into the area of the orifice ends of the steam-carrying tubes. Coaxial to the first cooling chamber a common second cooling chamber preferably is provided, which is surrounded by the first cooling chamber.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: November 25, 2003
    Assignee: Metallgesellschaft AG
    Inventors: Lothar Brehm, Waldemar Liebner, Gunter Quass, Uwe Zwiefelhofer
  • Patent number: 6627171
    Abstract: Process for producing Iron carbide wherein, in a first stage, Iron ore is reduced to sponge iron using a reducing gas containing at least 90% hydrogen, on a nitrogen-free basis, to produce a sponge iron having a carbon content of less than 1% wt.; then in a second stage the sponge iron is fluidized at a temperature of 500 to 800° C. with a methane-containing fluidizing gas in a fluidized bed reactor wherein the water content of the gas in the reactor is not more than 1.5% wt., to produce a product wherein at least 85% of the iron content is in the form of Fe3C.
    Type: Grant
    Filed: March 15, 2000
    Date of Patent: September 30, 2003
    Assignee: Metallgesellschaft AG
    Inventors: Martin Hirsch, Michael Stroeder, Peter Weber
  • Patent number: 6599374
    Abstract: An end product containing iron carbide (Fe3C) is produced from an intermediate product consisting of granular, directly reduced iron. Said intermediate product is supplied by an iron ore reduction plant and is fed to a carburization reactor. Liquid hydrocarbons are conveyed to the carburization reactor at temperatures of 500 to 900° C., at least part of the granular, directly reduced iron being subjected to a swirling movement. The end product removed from the carburization reactor consists of 5 to 90 wt. % Fe3C. A fluidization gas containing methane and hydrogen can be added to the carburization reactor in addition to the hydrocarbons.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: July 29, 2003
    Assignee: Metallgesellschaft AG
    Inventors: Martin Hirsch, Alpaydin Saatci
  • Patent number: 6524362
    Abstract: The direct reduced iron (DRI) which for at least 80 wt-% has a grain size of not more than 3 mm is melted in an electric arc furnace. The furnace contains a bath of liquid iron. During the operation of the furnace a foamy slag layer is formed on the bath and the DRI falls by gravity through at least one movable lance into the foamy slag layer on the iron bath. Preferably, the distance of the aperture of the lance to the iron bath is kept practically constant.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: February 25, 2003
    Assignee: Metallgesellschaft AG
    Inventors: Heinz Eichberger, Siegfried Schimo, Michael Stroeder, William Wells
  • Patent number: 6517613
    Abstract: A tank for containing granular adsorbers for cleaning gases, wherein the tank has a gas inlet, a gas distributing chamber, at least one adsorption chamber defined by vertical, gas-permeable walls and containing a charge of adsorbers in bulk, an outflow chamber and a gas outlet. Each gas-permeable wall consists of horizontal rails of plastic arranged at a distance above one another, through which pass vertical centering rods of plastic. At least half of the rails have the cross-sectional profile of an inverted U. In the tank at least one vertical supporting wall is arranged, which divides the adsorption chamber. At least the surface of the supporting wall consists of plastic.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: February 11, 2003
    Assignee: Metallgesellschaft AG
    Inventors: Bruno Schumm, Bernd Reichert
  • Patent number: 6488901
    Abstract: A process for adjusting a circulating fluidized bed, wherein a part of the carrier gas is recovered, mixed with a propellant and returned to the fluidized bed as a carrier gas.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: December 3, 2002
    Assignee: Metallgesellschaft AG
    Inventors: Hans-Werner Schmidt, Martin Rahn, Horst Heisswolf, Marc Schnell, Bernd Erkes
  • Patent number: 6488742
    Abstract: Process for the removal of metal cabonyls before regeneration of a desulfurization wash liquid, which includes removing a part of the carbon monoxide from the wash liquid, conversion of the metal carbonyls to metal sulfides, passing the wash liquid through a reaction and settling zone, removing metal sulfide-containing sludge from the reaction and settling zone, and regenerating the wash liquid.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: December 3, 2002
    Assignee: Metallgesellschaft AG
    Inventors: Gerhard Grünewald, Uwe Zwiefelhofer
  • Patent number: 6454831
    Abstract: A fine-grained product with a grain size of 100%<5 mm is obtained during the production of titanium dioxide in the chloride method in which titanium-containing raw material is reacted with gaseous chlorine in the presence of a carbon-rich substance, preferably coal and/or coke, in a chlorination reactor, preferably with a fluidized bed, to form titanium tetrachloride, the fine-grained product consisting, in the dried state, of the main constituents TiO2, coal and SiO2, mixed with filter salt (iron sulfate that is obtained during dilute acid recovery), residues containing TiO2 from TiO2-production according to the sulfate method, coal, sulfur, and ilmenite/TiO2-slag. This mixture is treated in a fluidized bed furnace or rotating tubular furnace at temperatures of 900 to 1,300° C. The mixture is used as a flux for the purpose of improving the durability of the brick lining of a furnace for the smelting-metallurgical production of metallic materials.
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: September 24, 2002
    Assignee: Metallgesellschaft AG
    Inventors: Djamschid Amirzadeh-Asl, Wolfgang Roder, Wolf-Dieter Griebler
  • Patent number: 6352572
    Abstract: The wet granulated iron ore is initially conducted through a drying zone. The ore leaves the drying zone at a temperature of 120-400° C. The ore is then heated in direct contact with hot gas to temperatures of 700-1,100° C. before being delivered to a reduction zone. The ore coming out of the drying zone is fully or partially guided through a separating device so as to separate the ore into fine and coarse grain fractions. The fine-grained ore fraction is conveyed to a granulating device so as to produce an iron ore granulate which is conducted to the drying zone. The coarse-grained ore fraction is heated to temperatures of 700-1,100° C. before it is guide into the reduction zone.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: March 5, 2002
    Assignee: Metallgesellschaft AG
    Inventors: Ali Beyzavi, Martin Hirsch
  • Patent number: 6153015
    Abstract: The process for removing a soap-contaminated conversion layer remaining on a metal workpiece after cold-forming with an aqueous acidic cleaning composition containing water, a surfactant such as an alkyl amine ethoxylate and nitric acid, phosphoric acid and/or amidosulphonic acid includes immersing the contaminated metal workpiece in the aqueous acidic cleaning composition at a temperature above C. until it has a clean bright surface and a fatty acid formed by reaction of the soap in the conversion layer is dispersed in the cleaning composition and then subsequently separating the metal workpiece from the cleaning solution and, after the separating, cooling the recovered aqueous acidic cleaning composition to a temperature below C. until a fatty acid layer including the fatty acid is separated from the aqueous acidic cleaning composition.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: November 28, 2000
    Assignee: Metallgesellschaft AG
    Inventors: Joachim Geldner, Klaus Wittel, Georg Bluemlhuber
  • Patent number: 6150570
    Abstract: The continuous process for making crystalline D-sorbitol using a melt crystallizer consisting of a cooled container and a horizontally arranged rotatable shaft equipped with disk elements and mixing parts to form a worm includes evaporating an aqueous D-sorbitol solution at 5 to 200 mbar and at a temperature of to C. in vacuum, advantageously in a thin film evaporator, to obtain a D-sorbitol melt containing less than 0.5 % by weight water; cooling the D-sorbitol melt to a temperature of 5 to C. above a solidification point of the D-sorbitol melt; melt crystallizing the D-sorbitol melt obtained during the evaporating in the melt crystallizer with an average dwell time of 1 to 5 hours to form D-sorbitol crystals and grinding and sieving the D-sorbitol crystals formed during the melt crystallizing of step d) to form a D-sorbitol end product containing more than 90% by weight of a .gamma. modification of crystalline D-sorbitol.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: November 21, 2000
    Assignee: Metallgesellschaft AG
    Inventors: Pedro Gutmann, Jakob Wiesenbart
  • Patent number: 6005044
    Abstract: A coating composition is described which is applied to a substrate and contains ultra-fine TiO.sub.2. This coating composition contains from 0.5 to 30.0% by volume of colored pigment and/or carbon black, from 55.0 to 98.5% by volume binder solids and from 0.3 to 15% by volume ultra-fine TiO.sub.2 having a particle size of 5 to 40 nm. It has a high total reflectance and intensive depth of color. Furthermore, a method of making the coating composition is described. Finally, the use of the coating composition as a finishing lacquer for motor vehicles, industrial coating, printing ink, coil coating, package coating, plastic coating and decorative paint, and also as paint, is described.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: December 21, 1999
    Assignee: Metallgesellschaft AG
    Inventors: Wolf-Ruediger Karl, Jochen Winkler
  • Patent number: 6001640
    Abstract: A degumming step in the production of edible oils is disclosed. Vegetable oils from which hydratable phosphatides have preferably been eliminated by a previous aqueous degumming process, are freed from non-hydratable phosphatides by an enzymatic treatment, so that they may be physically refined. The main characteristic of the invention is the use of phospholipase from an Aspergillus strain. The process is gentle, economical and environment-friendly.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: December 14, 1999
    Assignees: Roehm GmbH, Metallgesellschaft AG
    Inventors: Fridolin Loeffler, Hermann Plainer, Bruno Sproessler, Hans Ottofrickenstein
  • Patent number: 5935517
    Abstract: A carbon monoxide containing gas mixture at a temperature of C. is conducted through the inner protective tubing of a sheath tube lined with a thermally insulating protecting composition. The inner tubing is divided into sections and a potentially CO-free mass is introduced in the sheath tube in the regions of the thermally insulating mass to permeate the latter and form a barrier between the carbon monoxide gas and sheath tube, thereby eliminating hot spots and metal dusting corrosion.
    Type: Grant
    Filed: January 25, 1996
    Date of Patent: August 10, 1999
    Assignee: Metallgesellschaft AG
    Inventors: Werner Roll, Friedrich W. Hohmann
  • Patent number: 5720867
    Abstract: An electrolytic cell comprising bipolar electrodes is employed for electrochemical deposition of copper, zinc, lead, nickel or cobalt. An interior space is provided between the cathode side and the anode side of a bipolar electrode. The electrolyte can flow substantially without an obstruction through the interelectrode space between adjacent electrodes. The current densities in the interelectrode space amount to 800 to 8000 A/m.sup.2. Gas is evolved on the anode side of the bipolar electrodes and causes liquid to flow along the anode side. In the middle of the height of the anode side that liquid flow has a vertical component having a velocity of 5 to 100 cm/second. Electrolyte solution flows from the upper edge portion of the anode side to a return flow space, in which the solution flows downwardly. From the return flow space the solution is returned to the lower portion of the interelectrode space.
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: February 24, 1998
    Assignee: Metallgesellschaft AG
    Inventors: Nikola Anastasijevic, Gerhard Jedlicka, Karl Lohrberg
  • Patent number: 5677543
    Abstract: Disclosed is a dissolved methyllithium-containing composition for use in synthesis reactions (synthesis composition) and processes of preparing the composition. In the sythesis composition the methyllithium is contained in a solvent of the general formula (I) ##STR1## wherein independently R.sup.1 and R.sup.2 are a hydrogen, methyl or ethyl residue and R.sup.3 and R.sup.4 are a methyl or ethyl residue. To prepare the methyllithium-containing synthesis composition of the invention lithium powder or granular lithium is dispersed in a solvent having the general formula I, methyl halide is added at a controlled rate, the reaction temperature is maintained in the range of from to C., and the resulting lithium halide is separated from the methyllithium solution.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: October 14, 1997
    Assignee: Metallgesellschaft AG
    Inventors: Wilfried Weiss, Peter Rittmeyer, Ute Emmel
  • Patent number: 5660615
    Abstract: Exhaust gas is brought into contact with a washing liquid chiefly consisting of water in at least two washing stages. In the last washing stage, fresh water and/or a washing liquid containing fresh water is sprayed into the exhaust gas. In the penultimate washing stage, the exhaust gas is brought in contact with a circulating aqueous salt solution, which contains substances supplied by the exhaust gas. In the penultimate washing stage, the exhaust gas is passed through a washing zone at temperatures in the range from to C., where the quantity of aqueous salt solution passed into the washing zone per Nm.sup.3 exhaust gas flowing through the washing zone is 0.1 to 10 liters. The exhaust gas coming from the penultimate washing zone has a temperature in the range from to C., is saturated with steam for 90 to 100%, and does not contain more than 50% by weight of the dust content of the exhaust gas before the same enters the penultimate washing stage.
    Type: Grant
    Filed: February 15, 1996
    Date of Patent: August 26, 1997
    Assignee: Metallgesellschaft AG
    Inventors: Ulrich Neumann, Wolfgang Willing
  • Patent number: 5608122
    Abstract: A liquid starting mixture contains at least one fatty acid having 6 to 30 carbon atoms per molecule and per mole of fatty acid comprises 1.0 to 1.5 moles of fatty alcohol having 6 to 30 carbon atoms. An intermediate product which contains at least 50% by weight is prepared from the liquid starting product, which is passed at temperatures from about 120 to C. through a stirring zone and is sprayed and water vapor is removed. The intermediate product is hydrogenated to produce a raw product, which contains at least 75% by weight fatty alcohol. A partial stream which contains fatty alcohol is removed from the raw product and is added to the liquid starting mixture. The intermediate product which contains at least 50% by weight wax ester can be prepared without use of a solids containing catalyst.
    Type: Grant
    Filed: April 3, 1996
    Date of Patent: March 4, 1997
    Assignee: Metallgesellschaft AG
    Inventors: Henning Buchold, Fritz-J urgen G artner, Gert Mallok, Eberhard Schlichting, Hans-Martin St onner