Patents Assigned to VTU - Engineering GmbH
  • Process for processing residual substances containing at least one nonferrous metal and/or compounds thereof
    Patent number: 6468327
    Abstract: The invention relates to a method for processing residues containing at least one non-ferrous metal, preferably chosen from the group comprising zinc, lead, nickel, copper and cadmium and/or compounds thereof. According to this method, the non-ferrous metal is extracted from the residues by an extracting agent containing a carboxylic acid and/or a substituted carboxylic acid and/or its alkali salts and/or ammonium salts and/or mixtures thereof.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: October 22, 2002
    Assignee: VTU - Engineering GmbH
    Inventors: Matthaeus Siebenhofer, Wilhelm Hans Zapfel, Hertha Luttenberger