Patents Assigned to Molycorp Minerals, LLC
  • Composition for removing arsenic from aqueous streams
    Patent number: 7686976
    Abstract: Arsenic is removed from water and other aqueous feeds by (1) treating the feed with a compound containing cerium in the +4 oxidation state, preferably cerium dioxide, to oxidize arsenic in the +3 oxidation state to arsenic in the +5 oxidation state and (2) removing the arsenic in the +5 oxidation state from the aqueous phase, normally by contacting the treated feed with alumina or other precipitating agent containing cations in the +3 oxidation state.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: March 30, 2010
    Assignee: Molycorp Minerals, LLC
    Inventors: Richard Donald Witham, Edward Bayer McNew, John Leslie Burba, III
  • WATER PURIFICATION DEVICE FOR ARSENIC REMOVAL
    Publication number: 20100044317
    Abstract: Arsenic is removed from water and other aqueous feeds by (1) treating the feed with a compound containing cerium in the +4 oxidation state, preferably cerium dioxide, to oxidize arsenic in the +3 oxidation state to arsenic in the +5 oxidation state and (2) removing the arsenic in the +5 oxidation state from the aqueous phase, normally by contacting the treated feed with alumina or other precipitating agent containing cations in the +3 oxidation state.
    Type: Application
    Filed: November 2, 2009
    Publication date: February 25, 2010
    Applicant: MOLYCORP MINERALS, LLC
    Inventors: Richard Donald Witham, Edward Bayer McNew, John Leslie Burba, III