Method of preparing a product based on phosphate of thorium...

Details Method of preparing a product based on phosphate of thorium... Method of preparing a product based on phosphate of thorium...

2007-03-27

2007-03-27

Vanoy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

C423S003000, C423S011000, C423S015000, C423S018000, C423S020000, C423S021100, C423S305000, C423S306000, C423S249000, C423S250000, C423S251000, C423S252000, C423S253000, C423S263000, C252S625000, C588S001000, C588S018000, C588S020000

Reexamination Certificate

active

10504052

ABSTRACT:
The invention relates to a process for the preparation of a product based on a phosphate of at least one element M(IV), for example of thorium and/or of actinide(IV)(s).This process comprises the following stages:a) mixing a solution of thorium(IV) and/or of at least one actinide(IV) with a phosphoric acid solution in amounts such that the molar ratioPO4M⁢⁢(IV) is from 1.4 to 2,b) heating the mixture of the solutions in a closed container at a temperature of 50 to 250° C. in order to precipitate a product comprising a phosphate of at least one element M chosen from thorium(IV) and actinide(IV)s having a P/M molar ratio of 1.5, andc) separating the precipitated product from the solution.The precipitate can be converted to phosphate/diphosphate of thorium and of actinide(s). The process also applies to the separation of uranyl ions from other cations.

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patent: WO 96/30300 (1996-10-01), None
P. Benard et al. “Th4(PO4)4P2O7, a New Thorium Phosphate: Synthesis, Characterization, and Structure Determination” Chem. Mater. 1996 (8), pp. 181-188.
Dacheux et al., “Investigations of systems ThO2-MO2-P2O5(M=U, Ce, Zr, Pu). Solid solutions of thorium-uranium (IV) and thorium-plutonium (IV) phosphate-diphosphates”,Journal of Nuclear Materials, Feb. 1998, vol. 252, No. 3, pp. 179-186.
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Dacheux et al., Actinides immobilization in new matrices based on solid solutions: Th4-xMxIV(PO4)4P2O7, (MIV=238U,239Pu),Journal of Alloys and Compounds, Jun. 12, 1998, vol. 271-273, pp. 236-239.
Dacheux et al., “Investigation of the sustem ThO2-NpO2-P2O5. Solid solutions of thorium-neptunium (IV) phosphate-diphosphate”,Journal of Nuclear Materials, Nov. 1998, vol. 257, No. 2, pp. 108-117.
Thomas et al., “Kinetic and thermodynamic studies of the dissolution of thorium-uranium (IV) phosphate-diphosphate solid solutions”,Journal of Nuclear Materials, Jun. 2001, vol. 295, No. 2-3, pp. 249-264.

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