Method for co-precipitation of actinides in different oxidation states and method for preparation of mixed actinide compounds
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A technology of actinide elements and oxidation states, which is applied to the mixed oxide O2 of uranium and plutonium, the above mixed oxides, the preparation of mixed compounds of actinide elements, and the co-precipitation of various actinide elements, which can solve difficult problems
Active Publication Date: 2007-05-09
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES +1
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Problems solved by technology
The use of this co-precipitation method is not always simple, especially the stabilization of actinide (IV) mixtures requires several steps and is not easily compatible with the continuous co-precipitation operations often required for industrial manufacture
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Embodiment 1 to 6
[0243] The invention will now be described with reference to the following examples, which are given for purposes of illustration and not limitation.
Embodiment 1
[0245] In this example, oxalic acid solution was used to co-precipitate U(IV) and Pu(III) stabilized by hydrazine ions in solution.
[0254] Simultaneous and homogeneous co-precipitation is obtained by thoroughly mixing the actinide mixture with the precipitation solution in equal proportions at room temperature.
[0255] Calcination of the oxalate coprecipitate in argon at above 650 °C for 1 h resulted in a perfectly homogeneous mixed oxide (U,Pu)O equivalent to a solid solution 2 .
[0256] The precipitation yields of each actinide were higher than 99%.
Embodiment 2
[0258] In this example, oxalic acid solution was used to co-precipitate U(IV) and Pu(III) stabilized by hydrazine ions in solution with different ratios of uranium and plutonium.
[0259] The operating conditions are as follows:
[0260] Actinide mixtures:
[0261] [U(IV)]=0.080mol·L -1
[0262] [Pu(III)]=0.0305mol·L -1
[0263] [N 2 h 5 + ]=0.10mol L -1
[0264] [HNO 3 ]=1.0mol L -1
[0265] Precipitation solution:
[0266] [H 2 C 2 o 4 ]=0.51mol L -1
[0267] [HNO 3 ]=1.0mol L -1
[0268] Simultaneous and homogeneous co-precipitation is obtained by thoroughly mixing the actinide mixture with the precipitation solution in equal proportions at room temperature.
[0269] The precipitation yields of each actinide were higher than 99%.
[0270] Co-precipitates consisting of homogeneous mixed oxalates were calcined in argon at above 650 °C for 1 h, resulting in perfectly homogeneous mixed oxides equivalent to solid solutions (U 0.725 , Pu 0.275 )O 2 .
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Abstract
The invention relates to a method for co-precipitation (or simultaneous preparation) of at least one actinide in oxidation state (IV) with at least one actinide in oxidation state (III), in which a mixed solution of actinide(s) in oxidation state (IV) and actinide(s) in oxidation state (III) is prepared with addition of either a mono-charged cation which stabilises the oxidation states in the mixture, or a mono-charged cation with no stabilizing role for the oxidation states in the mixture and a solution containing oxalate ions is added to said mixture of actinides to produce a co-precipitation, or simultaneous precipitation of said actinides of oxidation state (IV) and (III) and a fraction of the mono-charged cation. According to another embodiment, a mixed solution of actinide(s) in oxidation state (IV) and actinide(s) in oxidation state (III) is prepared and a solution containing oxalate ions and a mono-charged cation is added to said mixture of actinides to produce the co-precipitation. The invention further relates to mixed actinide compounds from calcination of the precipitate above. Said mixed compounds such as oxides, carbides or nitrides are particularly of use in the production of nuclear fuel, for the production of transmutation targets or for the stable storage of nuclear material.
Description
technical field [0001] The present invention relates to a method for co-precipitating actinides having different oxidation states. [0002] More specifically, the present invention relates to a method for co-precipitating (i.e. simultaneously precipitating) a plurality of actinides, wherein at least one of the actinides involved is in an oxidation state (or oxidation level, degré d'oxidation) (IV) and at least One of the actinides involved is in the oxidation state (III). [0003] The invention also relates to a process for the preparation of mixed compounds of actinides, in particular mixed oxides, nitrides or carbides of actinides. [0004] The technical field of the invention can generally be defined as the preparation of mixed compounds of actinides, such as mixed oxides of actinides, especially mixed oxides of uranium and plutonium (U,Pu)O 2 and the technical field of refractory mixed compounds including some elements of the actinide group from thorium to californium. ...
Claims
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