Patents by Inventor Marga Retha Burger

Marga Retha Burger 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).

  • Aqueous leaching process for recovery of precious metals with addition of di-thiooxamide ligand
    Patent number: 8936667
    Abstract: This invention relates to a process for the recovery of precious metal/s from a precious metal-containing material in an aqueous leach slurry or solution. The process includes the step of contacting the precious metal/s in the leach slurry or solution with a ligand selected from dithiooxamide (rubeanic acid), or a substituted dithiooxamide. The leaching of PGMs, gold and silver from their ores using the ligand of the present invention may take place under aqueous alkaline conditions, avoiding both corrosive acidic conditions and the use of cyanide.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: January 20, 2015
    Assignee: Anglo Operations Limited
    Inventors: Diandree Padayachee, Makhosazane Chucky Kunene, Marga Retha Burger, Noko Simon Phala
  • AQUEOUS LEACHING PROCESS FOR RECOVERY OF PRECIOUS METALS WITH ADDITION OF DI-THIOOXAMIDE LIGAND
    Publication number: 20120227545
    Abstract: This invention relates to a process for the recovery of precious metal/s from a precious metal-containing material in an aqueous leach slurry or solution. The process includes the step of contacting the precious metal/s in the leach slurry or solution with a ligand selected from dithiooxamide (rubeanic acid), or a substituted dithiooxamide. The leaching of PGMs, gold and silver from their ores using the ligand of the present invention may take place under aqueous alkaline conditions, avoiding both corrosive acidic conditions and the use of cyanide.
    Type: Application
    Filed: July 21, 2010
    Publication date: September 13, 2012
    Applicant: ANGLO OPERATIONS LIMITED
    Inventors: Diandree Padayachee, Makhosazane Chucky Kunene, Marga Retha Burger, Noko Simon Phala