Patents by Inventor Torsten E. Jensfelt

Torsten E. Jensfelt 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: 4396426
    Abstract: Lead is recovered from sulphidic lead raw-material containing impurities of the kind bismuth, arsenic, antimony and tin, by flame-smelting the material with an oxygen-containing gas. The oxygen potential and temperature are adapted during the flame-smelting process so that the product formed thereby comprises substantially a lead-sulphide melt substantially free of volatile, sulphidic and metallic impurities of the said kind. The lead-sulphide melt is brought into contact with an oxidic lead material substantially free of impurities of the aforementioned kind, while oxidizing the sulphide-sulphur content of the material and forming a melt substantially free of sulphur. Lead is recovered from the melt by separation, optionally after subjecting the melt or a part thereof to a reducing process.
    Type: Grant
    Filed: November 18, 1981
    Date of Patent: August 2, 1983
    Assignee: Boliden Aktiebolag
    Inventors: Torsten E. Jensfelt, Stig A. Petersson
  • Patent number: 4388110
    Abstract: The metal content of complex sulphidic metal raw material is recovered therefrom by means of an autogenous flame-smelting process, preferably carried out in a vortex, with an oxygen-containing gas. The raw materials are smelted in a furnace in the presence of an excess of oxygen and together with an addition of an acid slag former, such as silica, to form a melt which is rich in metal-oxide silicate and poor in sulphur. Any metal phase formed in the furnace is separated from the silicate phase, and non-iron metals present in the silicate phase are recovered therefrom by selective reduction.
    Type: Grant
    Filed: November 18, 1981
    Date of Patent: June 14, 1983
    Assignee: Boliden Aktiebolag
    Inventors: Torsten E. Jensfelt, Stig A. Petersson