The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 2021
Filed:
Jun. 29, 2017
Orano Cycle, Courbevoie, FR;
Institut Français Des Sciences ET Technologies Des Transports, DE L'aménagement ET Des Réseaux, Marne-la-Vallée, FR;
Lavinia Stefan, Saint-Germain-en-Laye, FR;
Thierry Chaussadent, Paris, FR;
Nadia Dominique, Paris, FR;
ORANO DÉMANTÈLEMENT, Courbevoie, FR;
INSTITUT FRANÇAIS DES SCIENCES ET TECHNOLOGIES DES TRANSPORTS, DE L'AMÉNAGEMENT ET DES RÉSEAUX, Marne-la-Vallée, FR;
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.