Method for immobilizing a mercury-containing waste

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United States of America Patent

PATENT NO 11000719
APP PUB NO 20190336806A1
SERIAL NO

16312516

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Abstract

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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.

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Patent Owner(s)

  • ORANO DÉMANTÈLEMENT; INSTITUT FRANÇAIS DES SCIENCES ET TECHNOLOGIES DES TRANSPORTS, DE L'AMÉNAGEMENT ET DES RÉSEAUX

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chaussadent, Thierry Paris, FR 2 0
Dominique, Nadia Paris, FR 1 0
Stefan, Lavinia Saint-Germain-en-Laye, FR 2 0

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