Method for co-precipitation of actinides in different oxidation states and method for preparation of mixed actinide compounds
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
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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.
[0246] The operating conditions are as follows:
[0247] Actinide mixtures:
[0248] [U(IV)]=[Pu(III)]=0.056mol L -1
[0249] [N 2 h 5 + ]=0.10mol L -1
[0250] [HNO 3 ]=1.0mol L -1
[0251] Precipitation solution (precipitating solution):
[0252] [H 2 C 2 o 4 ]=0.50mol L -1
[0253] [HNO 3 ]=1.0mol L -1
[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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