Ceramicrete stabilization of u-and pu-bearing materials

Details Ceramicrete stabilization of u-and pu-bearing materials Ceramicrete stabilization of u-and pu-bearing materials

G - Physics

21

F

G21F 9/04 (2006.01) G21F 9/16 (2006.01) G21F 9/28 (2006.01)

Patent

CA 2540287

A method of stabilizing nuclear material is disclosed. Oxides or halides of actinides and/or transuranics (TRUs) and/or hydrocarbons and/or acids contaminated with actinides and/or TRUs are treated by adjusting the pH of the nuclear material to not less than about 5 and adding sufficient MgO to convert fluorides present to MgF2 y alumina is added in an amount sufficient to absorb substantially all hydrocarbon liquid present, after which a binder including MgO and KH2PO4 is added to the treated nuclear material to form a slurry. Additional MgO may be added. A crystalline radioactive material is also disclosed having a binder of the reaction product of calcined MgO and KH2PO4 and a radioactive material of the oxides and/or halides of actinides and/or transuranics (TRUs). Acids contaminated with actinides and/or TRUs, and/or actinides and/or TRUs with or without oils and/or greases may be encapsulated and stabilized by the binder.

L'invention concerne un procédé permettant de stabiliser une matière nucléaire. On traite des oxydes ou des halogénures d'actinides et/ou de transuraniens (TRU) et/ou d'hydrocarbures et/ou d'acides contaminés par des actinides et/ou des TRU en réglant le pH de la matière nucléaire à au minimum environ 5 et en ajoutant suffisamment de MgO pour transformer les fluorures à MgF¿2?. On ajoute .UPSILON.alumine en quantité suffisante pour sensiblement absorber tout le liquide d'hydrocarbures présent ; après quoi, on ajoute un liant comprenant MgO et KH¿2?PO¿4? à la matière nucléaire traitée pour former une boue. On peut aussi ajouter MgO additionnel. L'invention concerne en outre une matière radioactive cristalline présentant un liant du produit de réaction MgO et KH¿2?PO¿4? calcinés et d'une matière radioactive des oxydes ou des halogénures d'actinides et/ou de transuraniens (TRU). Les acides contaminés par les actinides et/ou les TRU, et/ou les actinides et/ou les TRU avec ou sans huiles et/ou graisses peuvent être encapsulés et stabilisés par le liant.

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