Patents Represented by Attorney John McMahon
  • Patent number: 6869520
    Abstract: The invention relates to a process involving the following steps: a) performing leaching of the raw material with an acid aqueous solution to dissolve the zinc if said raw material is a solid; b) optionally performing solid-liquid separation; c) neutralizing the aqueous solution once the zinc-containing raw material is in liquid form; d) performing solid-liquid separation of the solution rich in zinc from the solids precipitated during the neutralization step; e) extracting the zinc using an acid organic solvent; f) purifying the organic solvent from the extraction step; g) re-extracting zinc from the organic solvent using an acid aqueous solution; h) recovering the zinc by electrolysis and/or crystallization and/or precipitation.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: March 22, 2005
    Assignee: Tecnicas Reunidas S. A.
    Inventors: Daniel Martin San Lorenzo, Gustavo Diaz Nogueira, Miguel Angel Garcia Leon
  • Patent number: D497019
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: October 5, 2004
    Inventor: Kwok Lang Lee
  • Patent number: D497020
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: October 5, 2004
    Inventor: Kwok Lang Lee