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Novel solidified dielectric material suitable for simultaneously lattice solidifying actinium nuclide and fission product 90Sr as well as preparation method thereof

A technology of dielectric materials and fission products, which is applied in the field of new solidified dielectric materials and its preparation, can solve the problems of restricting the popularization and application of nuclear waste treatment, the difficulty and complexity of the treatment process, and the difficulty of obtaining pure phase materials, so as to avoid multiple separations/ The effect of sorting solidification, simple treatment process, and minimization of waste volume

Inactive Publication Date: 2014-03-26
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0005] Although the above two dielectric materials exhibit good stability when solidifying a single high-radioactive nuclide, they cannot contain both actinides and fission products like the glass body, which leads to the need for these two types of nuclides before solidification. Multiple extractions, separations and then solidification respectively, the processing process is difficult and complicated
In addition, the preparation methods of the above two types of dielectric materials are relatively harsh, and the sintering temperature needs to be above 1500°C, and the sintering time is also very long (≥48h). It is difficult to obtain pure phase materials, which limits their promotion in the field of nuclear waste treatment. application

Method used

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  • Novel solidified dielectric material suitable for simultaneously lattice solidifying actinium nuclide and fission product 90Sr as well as preparation method thereof
  • Novel solidified dielectric material suitable for simultaneously lattice solidifying actinium nuclide and fission product 90Sr as well as preparation method thereof
  • Novel solidified dielectric material suitable for simultaneously lattice solidifying actinium nuclide and fission product 90Sr as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 : Made 0.5(1-x) La 2 Zr 2 o 7 -xSrZrO 3 (0.2≤x≤0.8) Composite curing medium material

[0049] With a purity of 99.99% La(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·3H 2 O and Sr(NO 3 ) 2 As a raw material, prepare a standard aqueous solution with a concentration of 0.1mol / L. Using a precision of 10 -4 g's electronic balance accurately weighs the required raw materials, puts them into a 1L glass beaker filled with 500ml of ultrapure water and stirs them magnetically, pours them into a 1L standard volumetric flask after completely dissolving, and then rinses the beaker with 100ml of ultrapure water Then pour it into a standard volumetric flask, repeat this 4 times, and finally use a burette with an accuracy of 0.1ml to drop ultrapure water until the scale of the standard volumetric flask is ready for use.

[0050] Using a burette with a capacity of 25ml and an accuracy of 0.1ml, the molar ratio of LaO 1.5 :SrO:ZrO 2 =(1-x):x:1 (x=0.2, 0.4, 0.5, 0.6, 0.8) is...

Embodiment 2

[0054] Example 2 : Made 0.5(1-x)Nd 2 Zr 2 o 7 -xSrZrO 3 (0.2≤x≤0.8) Composite curing medium material

[0055] With a purity of 99.99% Nd(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·3H 2 O and Sr(NO 3 ) 2 As a raw material, prepare a standard aqueous solution with a concentration of 0.1mol / L. Using a precision of 10 -4 g's electronic balance accurately weighs the required raw materials, puts them into a 1L glass beaker filled with 500ml of ultrapure water and stirs them magnetically, pours them into a 1L standard volumetric flask after completely dissolving, and then rinses the beaker with 100ml of ultrapure water Then pour it into a standard volumetric flask, repeat this 4 times, and finally use a burette with an accuracy of 0.1ml to drop ultrapure water until the scale of the standard volumetric flask is ready for use.

[0056] Using a burette with a capacity of 25ml and an accuracy of 0.1ml, the NdO 1.5 :SrO:ZrO 2 =(1-x):x:1 (x=0.2, 0.4, 0.5, 0.6, 0.8) is accurately weig...

Embodiment 3

[0062] Example 3 : Made 0.5(1-x)Eu 2 Zr 2 o 7 -xSrZrO 3 (0.2≤x≤0.8) Composite curing medium material

[0063] With a purity of 99.99% Eu(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·3H 2 O and Sr(NO 3 ) 2 As a raw material, prepare a standard aqueous solution with a concentration of 0.1mol / L. Using a precision of 10 -4 g's electronic balance accurately weighs the required raw materials, puts them into a 1L glass beaker filled with 500ml of ultrapure water and stirs them magnetically, pours them into a 1L standard volumetric flask after completely dissolving, and then rinses the beaker with 100ml of ultrapure water Then pour it into a standard volumetric flask, repeat this 4 times, and finally use a burette with an accuracy of 0.1ml to drop ultrapure water until the scale of the standard volumetric flask is ready for use.

[0064] A burette with a capacity of 25ml and an accuracy of 0.1ml is used, and the molar ratio of EuO 1.5 :SrO:ZrO 2 =(1-x):x:1 (x=0.2, 0.4, 0.5, 0.6, 0....

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Abstract

The invention discloses a novel solidified dielectric material suitable for simultaneously lattice solidifying actinium nuclide and a fission product 90Sr as well as a preparation method thereof. The material is a composite material consisting of a pyrochlore structure Ln2Zr2O7 (Ln=La, Nd, Eu and Gd) and a perovskite structure SrZrO3. By utilizing the characteristics that the radiation stability and chemical stability of the Ln2Zr2O and the SrZrO3 are good and the actinium nuclide An<3+> and the fission product 90Sr<2+> can be respectively solidified onto a lattice position of Ln<3+> and Sr<2+> and the capacity is high, a purpose for simultaneously stably solidifying the two radionuclides containing the actinium nuclide and the 90Sr and minimizing the size of the waste can be realized, and the two radionuclides can be prevented from being respectively solidified after being separated. The preparation method adopts a sol-hot mist spraying way. By adopting the method, different components can be uniformly mixed on the atomic level, the existence of the instable solidified nuclide can be avoided, the synthesis temperature is low, the phase purity is high, and the process is simple.

Description

technical field [0001] The present invention relates to a method suitable for actinide nuclides and fission products 90 The invention discloses a novel solidification medium material and a preparation method thereof in which Sr is simultaneously solidified in a lattice, and belongs to the field of nuclear waste treatment. Background technique [0002] Energy is an important basis for the development of modern society, and my country is vigorously developing nuclear power. For the sustainable development of nuclear energy, my country will adhere to the technical route of nuclear fuel closed cycle, that is, it is necessary to reprocess the unloaded spent fuel. During reprocessing, after recovery of useful plutonium and unused uranium, the remainder—including more than 97% of fission products (such as 137 Cs, 90 Sr), a small amount of minor actinides (such as 237 Np, 241 Am, 247 Cm), still remaining in the waste liquid for processing. These two types of nuclides have the...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622G21F9/16
Inventor 江阔谢华刘松柏王烈林阮爽王成龙王开元
Owner SOUTHWEAT UNIV OF SCI & TECH
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