Patents by Inventor Sigmund P. Fugleberg

Sigmund P. Fugleberg 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).

  • Patent number: 5585079
    Abstract: The invention relates to a method for recovering zinc from a zinc oxide bearing material containing silicates. According to the method, the leaching of zinc compounds is carried out in circumstances where the silicates remain undissolved and consequently do not cause filtering problems. The silicate bearing residue is treated in a Waelz process, so that the major part of the silicic acid contained in the silicates is combined in the iron silicate slag formed in the Waelz process, and the zinc is returned into leaching mainly in oxidic form.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: December 17, 1996
    Assignee: Outokumpu Engineering Contracters Oy
    Inventor: Sigmund P. Fugleberg
  • Patent number: 5199974
    Abstract: The present invention relates to a method for recovering valuable metals contained in various metallurgic waste precipitates and dusts, and also to a method for forming of the rest of the waste precipitate or dust a slightly soluble product suited for further processing. The recovery of valuable metals and the forming of slightly soluble products is carried out in a suspension smelting furnace, in which case the smelting of the precipitates and dusts is mainly reducing.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: April 6, 1993
    Assignee: Outokumpu Research Oy
    Inventor: Sigmund P. Fugleberg
  • Patent number: 5178842
    Abstract: According to the method of the invention, at least one or several of the metals nickel, cobalt and copper can be selectively precipitated as sulphide by aid of elemental sulphur from aqueous solutions containing other metals such as zinc. The temperature of the reaction is above the melting point of sulphur. The precipitation is carried out with a pH value below 2. The metals to be precipitated can be present in the solution either as oxides or sulphates. If the metals are sulphates, the sulphide of at least one of the metals is prepared to crystal seeds in the solution before precipitation.
    Type: Grant
    Filed: October 26, 1988
    Date of Patent: January 12, 1993
    Assignee: Outokumpu Oy
    Inventor: Sigmund P. Fugleberg
  • Patent number: 5120353
    Abstract: The invention relates to a method for recovering various valuable materials in connection with the hydrometallurgical production of zinc. The method is particularly suited for feeding different types of raw materials into the various stages of a process carried out in atmospheric conditions. Valuable materials such as lead, silver and gold are recovered by means of the said method.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: June 9, 1992
    Assignee: Outokumpu Oy
    Inventors: Sigmund P. Fugleberg, Aimo E. Jarvinen
  • Patent number: 4698139
    Abstract: The purpose of the method is to remove chlorides and fluorides from a valuable metal raw material by leaching the raw material into sulphuric acid solution and by crystallizing the valuable metal sulphate selectively out of the solution. The valuable metal sulphate crystals are washed in sulphuric acid solution, and the recovered dechlorinated and defluorinated crystals are leached into water and conducted into electrolysis. The sulphuric acid solution employed in the raw material leaching and in the crystal washing is preferably the same as the return acid of the electrolysis. Chlorides and fluorides are removed from the mother liquor of crystallization in the bleed.
    Type: Grant
    Filed: January 6, 1986
    Date of Patent: October 6, 1987
    Assignee: Outokumpu Oy
    Inventors: Sigmund P. Fugleberg, Jaakko I. Poijarvi
  • Patent number: 4526650
    Abstract: The residual acid mixture containing metals which has been produced in the steel pickling process is regenerated to become new HF/HNO.sub.3 pickling acid by applying H.sub.2 SO.sub.4 addition and evaporation. The metal sulphate salt produced in evaporation is converted into scarcely soluble iron jarosite Na[Fe.sub.3 (SO.sub.4).sub.2 (OH).sub.6 ] and chrome and nickel hydroxide, the last mentioned metal hydroxide being obtained as a separately utilizable precipitate.The metal sulphate salt is separated from 60% H.sub.2 SO.sub.4 solution, wherein the main part of the salt is also crystallized. For promoting the crystallization, part of the salt is crystallized in a side line where 80% H.sub.2 SO.sub.4 concentration is used. The acid slurry produced is carried back to the crystallizing stage in the main line.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: July 2, 1985
    Assignee: Outokumpu Oy
    Inventors: Seppo I. Blomquist, Markku T. Saarela, Hannu J. Pouru, Bror G. Nyman, Kaj-Henrik Lindroos, Timo T. Koivunen, Sigmund P. Fugleberg
  • Patent number: 4452762
    Abstract: A process for the recovery of valuable metals from metallic alloys having iron as their principal constituent is disclosed in which the metal is leached by means of a sulfuric acid solution having such a concentration that a nearly saturated salt solution is obtained, and after the separation of a possible leach residue the solution is heated close to the boiling point, at which time an acid solution is added in an amount corresponding to the salt which has passed out of the solution, in order to crystallize the salt mixture, the crystallized material is separated from the solution and is decomposed under sulfating conditions, whereafter the metal salts are leached out from the iron oxide by means of water.
    Type: Grant
    Filed: June 5, 1981
    Date of Patent: June 5, 1984
    Assignee: Outokumpu Oy
    Inventors: Sigmund P. Fugleberg, Bror G. Nyman, Stig-Erik Hultholm, Asko Parviainen, Jussi Rastas
  • Patent number: 4220627
    Abstract: A process for the treatment of raw materials which contain arsenic and metal to produce a metal-free arsenic product and an arsenic-free metal sulfate is disclosed, in which the raw material is leached by using an aqueous solution of sulfuric acid and then the metals are crystallized as sulfates from the separated aqueous solution, which is separated from the metal sulfate crystals. The leach is performed at elevated temperature under oxidizing conditions, in order to bring the arsenic to a 5-valent form, the metal sulfates are crystallized out from the selectively separated, arsenate-bearing aqueous solution by cooling, and arsenic is removed from at least part of this aqueous solution before the aqueous solution is returned to the leach.
    Type: Grant
    Filed: November 1, 1978
    Date of Patent: September 2, 1980
    Assignee: Outokumpu Oy
    Inventors: Sigmund P. Fugleberg, Stig-Erik Hultholm, Bror G. Nyman, Jussi K. Rastas
  • Patent number: 4219354
    Abstract: A hydrometallurgical process for the treatment of a raw material which contains iron and other metals, with a sulfuric acid solution, in order to dissolve the metals and to precipitate and separate the iron, the separated metal sulfate solution being exposed to evaporation in order to crystallize and separate the metal sulfates from the mother liquor, which is recycled to the treatment stage performed with sulfuric acid solution, and the separated metal sulfate being recovered.
    Type: Grant
    Filed: October 27, 1978
    Date of Patent: August 26, 1980
    Assignee: Outokumpu Oy
    Inventors: Jussi K. Rastas, Sigmund P. Fugleberg, Seppo O. Heimala, Sitg-Erik Hultholm, Jaakko T. I. Poijarvi
  • Patent number: 4148862
    Abstract: A hydrometallurgical process for the treatment of a soluble silicate-bearing material for the recovery of its valuable metal content by leaching the silicate-bearing material at an elevated temperature with an aqueous solution of a mineral acid, precipitating silicic acid during the same stage in an easily settling and filtering form, the silicate-bearing material being added at such a rate that its concentration calculated as SiO.sub.2 corresponds to the simultaneously precipitating silicic acid quantity, and by finally separating the solid material from the valuable-metal-bearing solution.
    Type: Grant
    Filed: October 6, 1977
    Date of Patent: April 10, 1979
    Assignee: Outokumou Oy
    Inventors: Sigmund P. Fugleberg, Jaakko T. I. Poijarvi