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US 4,726,916 AGranted
Method for embedding and storing dangerous materials, such as radioactive materials in a monolithic container
AssigneeSociete Generale pour les Techniques Nouvelles S.G.N.
InventorsBruno Aubert, Serge Carpentier
Life of this patent
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Abstract
The present invention relates to a method for immobilizing and packing radioactive "ashes" in a mineral matrix, said method consisting in adjusting the coefficient of expansion of said ashes, molding around said ashes a porcelain in the raw state and taking the whole in one operation to form a hermetically sealed block.
Claims7
A method of containing and immobilizing radioactive waste material comprising the steps of:
- (a) forming by molding under pressure a containment vessel having a bottom and side walls, said containment vessel being formed from a porcelain slip;
- (b) mixing the radioactive waste with a ceramic-forming composition in proportions such that the coefficient of expansion of said mixture is substantially equal to the coefficient of expansion of said porcelain containment vessel;
- (c) depositing the radioactive waste/ceramic-forming composition mixture into said containment vessel;
- (d) compacting said mixture under pressure;
- (e) placing a cover over said containment vessel, said cover comprising a layer of the porcelain slip;
- and
- (f) heating the covered vessel at atmospheric pressure so as to allow any gases formed during heating to escape from the vessel and to solidify said vessel and the mixture therein.
4 more elements
Dependencies are inferred from the claim text.