Patents Assigned to Gianfranco Rambaldini
  • Method for extracting heavy metals from sulphurated mineral concentrates
    Patent number: 4420380
    Abstract: An electrolytic method is described for extracting heavy metals, in particular lead, from sulphide concentrates, wherein the concentrates are dissolved in molten chlorides and chlorinated. Then the chlorides of the metals to be extracted are subjected to electrolysis in molten salts, and the vapor phase sulphur separated by the chlorination step is then recovered as elemental sulphur.
    Type: Grant
    Filed: March 9, 1981
    Date of Patent: December 13, 1983
    Assignee: Gianfranco Rambaldini
    Inventor: Umberto Ducati