Method for solidifying actinium series nuclide by pyrochlore type rare earth zirconate

A zirconate and pyrochlore technology, applied in nuclear engineering, radioactive purification, etc., can solve the problems of long time, low efficiency, and cumbersome steps, and achieve the effect of high risk, high efficiency, and good safety

Active Publication Date: 2012-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] ① The steps are cumbersome, the reaction temperature is high, the time is long, the energy consumption is high, and the efficiency is low
[0015] ② The conditions are very extreme, the requirements for the reaction equipment are very strict, there is a danger of explosion during the reaction process, and it is difficult to realize industrial application

Method used

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  • Method for solidifying actinium series nuclide by pyrochlore type rare earth zirconate
  • Method for solidifying actinium series nuclide by pyrochlore type rare earth zirconate
  • Method for solidifying actinium series nuclide by pyrochlore type rare earth zirconate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] use Ce 4+ replace Pu 4+ Simulated curing of Pu (Note: Ce 4+ and Pu 4+ The ionic radii are very close and have similar reaction characteristics): Weigh 1.29g Zr(NO 3 ) 4 .5H 2 O (0.003mol), 0.87g Ce(NO 3 ) 3 .6H 2 O(0.002mol), 2.26g Gd(NO 3 ) 3 .6H 2 O (0.005mol) and 0.15gKF, fully ground, mixed evenly, transferred to the sintering furnace, from room temperature through 100min to 800 o C, kept for 6 hours; after it was naturally cooled, it was taken out, and the product was light yellow powder, which was put into 50ml water and soaked for 15min, filtered, washed, dried, and the product (Gd 2 Zr 0.6 Ce 0.4 o 7 ) powder X-ray diffraction pattern as figure 1 shown. The results show that the product is a single-phase pyrochlore structure, Ce 4+ It completely enters the crystal lattice of pyrochlore, that is, it is solidified into the crystal lattice by rare earth zirconate, and the inclusion capacity is 40%.

[0036] Refer to the American PCT (product cons...

Embodiment 2

[0038] with Nd 3+ Substitute trivalent actinides for simulated solidification: Weigh 2.15g Zr(NO 3 ) 4 .5H 2 O (0.005mol), 0.63g Nd(NO 3 ) 3 .5H 2 O(0.0015mol), 1.59g Dy(NO 3 ) 3 .6H 2 O (0.0035mol) and 0.2gKCl, fully ground, mixed evenly, transferred to the sintering furnace, from room temperature to 1000 after 120min o C, kept for 10 hours; after it was naturally cooled, it was taken out, and the product was a light pink powder, which was put into 50ml water and soaked for 15min, filtered, washed, dried, and the product (Dy 1.4 Nd 0.6 Zr 2 o 7 ) powder X-ray diffraction pattern as figure 2 shown. The results show that the product is a single-phase pyrochlore structure, Nd 3+ It completely enters the crystal lattice of pyrochlore, that is, it is solidified into the crystal lattice by rare earth zirconate, and the inclusion capacity is 30%.

[0039] Refer to the American PCT (product consistency test) method for powder soaking, the soaking agent is deionized w...

Embodiment 3

[0041] u 4+ Solidification: Weigh 1.72g Zr(NO 3 ) 4 .5H 2 O (0.004mol), 0.27g UO 2 (0.001mol), 1.91g Y(NO 3 ) 3 .6H 2 O (0.005mol) and 0.3gNaF, fully ground, mixed evenly, transferred to the sintering furnace, from room temperature through 120min to 1200 o C, kept for 10 hours; after it was naturally cooled, it was taken out, and the product was light brown powder, which was put into 50ml water and soaked for 15min, filtered, washed and dried, and the product (Y 2 Zr 1.6 u 0.4 o 7 ) powder X-ray diffraction pattern as image 3 shown. The results show that the product is a single-phase pyrochlore structure, U 4+ It completely enters the crystal lattice of pyrochlore, that is, it is solidified into the crystal lattice by rare earth zirconate, and the inclusion capacity is 20%.

[0042] Refer to the American PCT (product consistency test) method for powder soaking, the soaking agent is deionized water, 90±2 o C soaked for 7 days, the normalized leaching rate of U ...

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Abstract

The invention discloses a method for solidifying actinium series nuclide by pyrochlore type rare earth zirconate and belongs to the technical field of radioactive nuclear waste processing. The method includes adopting rare earth nitrate, zirconium nitrate or zirconium oxynitrate, actinium series nuclide raw materials and a little fluxing agent as raw materials, grinding and mixing the raw materials and directly placing the raw materials in a sintering furnace to conduct sintering under certain temperature to obtain a pyrochlore type rare earth zirconate solidified body containing actinium series nuclide. Therefore, radioactive nuclide can be solidified in lattices of the rare earth zirconate to facilitate deep geology processing. The whole solidification process does not require complex high-energy-consumption dangerous steps of repeated grinding, piece pressing, long-time high-temperature sintering, sol gel preprocessing, piece pressing, long-time high-temperature sintering and the like. The method is energy-saving, high in efficiency and good in safety and reduces consumption.

Description

technical field [0001] The invention belongs to the technical field of radioactive nuclear waste treatment, and in particular relates to a method for solidifying actinide nuclides with pyrochlore-type rare earth zirconates. Background technique [0002] With the development of nuclear technology application, the discharge of nuclear waste is increasing day by day. High-level radioactive waste contains a large amount of transuranic actinides, such as plutonium (Pu), uranium (U), neptunium (Np), americium (Am), curium (Cm), berkelium (Bk), californium (Cf), etc., and Long-lived fission products and highly radioactive 90 Sr and 137 Cs, α, β, γ, χ, neutrons and other high-energy rays produced by them can induce genetic mutations in plants and animals, seriously threatening the ecological environment of the earth. Therefore, the safe treatment and disposal of nuclear waste has become an important guarantee for solving nuclear pollution, further development and utilization, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/32G21F9/28
Inventor 李林艳蔡妍赵培柱徐晓庆
Owner TSINGHUA UNIV
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