Patents Assigned to ORANO DÉMANTÈLEMENT
  • Thiosulfates for use as retarders for magnesium phosphate cement pastes
    Patent number: 12258295
    Abstract: A use of a thiosulfate as a retarder for a cement paste comprising a magnesium phosphate cement.
    Type: Grant
    Filed: December 8, 2020
    Date of Patent: March 25, 2025
    Assignees: ORANO DEMANTELEMENT, UNIVERSITE GUSTAVE EIFFEL
    Inventors: Lavinia Stefan, Thierry Chaussadent, Hela Bessaies-Bey
  • Method for immobilizing a mercury-containing waste
    Patent number: 11000719
    Abstract: A process for immobilizing a mercury-containing waste, which comprises: —stabilizing the mercury of the waste by precipitating the mercury as mercury (II) sulfide; then —encapsulating the waste by cementation, the cementation comprising coating the waste in a cement paste obtained by mixing a composition comprising a powder of at least one binder chosen from hydraulic cements, alkali-activated cements and acid-activated cements, with an aqueous mixing solution, then hardening the cement paste; and which is characterized in that the precipitation of the mercury as mercury (II) sulfide is obtained by reacting the mercury with a thiosulfate in a basic aqueous medium, while stirring and in the presence of a sulfide of an alkali metal, the molar ratio of the thiosulfate to the mercury being at least equal to 1.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: May 11, 2021
    Assignees: ORANO DÉMANTÈLEMENT, INSTITUT FRANÇAIS DES SCIENCES ET TECHNOLOGIES DES TRANSPORTS, DE L'AMÉNAGEMENT ET DES RÉSEAUX
    Inventors: Lavinia Stefan, Thierry Chaussadent, Nadia Dominique