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A pyrochlore-type high-entropy oxide solidified body and its preparation method

A technology of oxide and solidified body is applied in the field of pyrochlore-type high-entropy oxide solidified body and its preparation, which can solve the problem of not being able to solidify multiple radionuclides at one time, and achieve the effect of high-efficiency solidification

Active Publication Date: 2021-11-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although pyrochlore Gd 2 Zr 2 o 7 Ceramic cured body has the above advantages, however, Gd 2 Zr 2 o 7 The ceramic solidified body has a strong selectivity to radionuclides, and can only selectively solidify some radionuclides with a single valence state and ionic radius (such as Pu 3+ 、Am 3+ 、Cm 3+ and Np 3+ and other nuclides), cannot solidify multiple radionuclides in nuclear waste at one time [Rodney C.Ewing, et al., Journal of Applied Physics 95(2004) 5949-5972]
However, there is no information about pyrochlore structure RE 2 B 2 o 7 Research report on high-entropy ceramic nuclear waste solidified body

Method used

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  • A pyrochlore-type high-entropy oxide solidified body and its preparation method
  • A pyrochlore-type high-entropy oxide solidified body and its preparation method
  • A pyrochlore-type high-entropy oxide solidified body and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0037] The preparation method of pyrochlore type high entropy oxide solidified body:

[0038] Will Y 2 o 3 , La 2 o 3 、Nd 2 o 3 Raw powder (~ particle size 1μm, purity >99wt%, Shanghai Diyang Industrial Co., Ltd.) and TiO 2 , ZrO 2 , HfO 2 (~Particle size 0.2 μm, purity>99wt%, Sinopharm Chemical Reagent Co., Ltd.) Dosing at a molar ratio of 1:1:1:2:2:2. With ethanol as the medium, ZrO 2 The ball is a grinding ball, and the ball mill is mixed at a speed of 560 rpm for 8 hours on a planetary ball mill, and then a dry mixed powder with a uniform composition is obtained by rotary evaporation; the obtained mixed powder is first dry-pressed at 5 MPa, and then cooled at 50 MPa. Isostatic pressing, the green body is put into an alumina crucible, and then placed in a muffle furnace. In an air atmosphere, the temperature is raised at a rate of 1°C / min, and sintered at 1300°C for 1h to prepare a high-entropy oxide solidified body.

[0039] After analysis: the XRD spectrum of th...

Embodiment 2

[0041] The preparation method of pyrochlore type high entropy oxide solidified body:

[0042] Will Y 2 o 3 , La 2 o 3 、Nd 2 o 3 Raw powder (~ particle size 5μm, purity >99wt%, Shanghai Diyang Industrial Co., Ltd.) and TiO 2 , ZrO 2 , HfO 2 , Nb 2 o 5 Powder (~ particle size 0.5μm, purity >99wt%, Sinopharm Chemical Reagent Co., Ltd.) is compounded at a molar ratio of 1:1:1:2:2:2:1, with ethanol as the medium, ZrO 2 The ball is a grinding ball, and the ball milling is carried out on a planetary ball mill at a speed of 500 rpm for 16 hours, and a dry mixed powder with a uniform composition is obtained by rotary evaporation; the obtained mixed powder is first dry-pressed at 10MPa, and then cooled at 100MPa Isostatic pressing, the green body is put into an alumina crucible, and then placed in a muffle furnace. In an air atmosphere, the temperature is raised at a rate of 10°C / min, and sintered at 1400°C for 3h to prepare a high-entropy oxide solidified body.

[0043] Afte...

Embodiment 3

[0045] The preparation method of pyrochlore type high entropy oxide solidified body:

[0046] Will Y 2 o 3 , La 2 o 3 、Nd 2 o 3 Raw powder (~ particle size 10μm, purity >99wt%, Shanghai Diyang Industrial Co., Ltd.) and TiO2 , ZrO 2 , HfO 2 , Nb 2 o 5 、TaO 2 Powder (~ particle size 1.0 μm, > purity 99wt%, Sinopharm Chemical Reagent Co., Ltd.) is compounded at a molar ratio of 1:1:1:2:2:2:1:2, with ethanol as the medium, ZrO 2 The ball is a grinding ball, and the ball mill is mixed at a speed of 450 rpm for 20 hours on a planetary ball mill, and a dry mixed powder with uniform components is obtained by rotary evaporation; the obtained mixed powder is first dry-pressed at 15MPa, and then cooled at 200MPa Isostatic pressing, the green body is put into an alumina crucible, and then placed in a muffle furnace. In an air atmosphere, the temperature is raised at a rate of 15°C / min, and sintered at 1500°C for 8h to prepare a high-entropy oxide solidified body.

[0047] After...

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Abstract

The invention relates to a pyrochlore-type high-entropy oxide solidified body and a preparation method thereof. The high-entropy oxide solidified body has a pyrochlore structure and the chemical formula is RE 2 m 2 o 7 , where RE is a rare earth element and M is a transition metal element. The pyrochlore-type high-entropy oxide solidified body of the present invention has excellent chemical stability, and can also solidify radionuclides of different valence states and types in the lattice of a high-entropy oxide substrate, which is convenient for deep geological disposal and rich A system for solidifying and treating base materials of radioactive nuclear wastes has been developed. The method has the advantages of low cost, simplicity, and wide application range. The process has high efficiency and good safety, and is expected to be applied in the technical field of radioactive nuclear waste treatment.

Description

technical field [0001] The invention belongs to the field of nuclear waste treatment materials and preparation thereof, in particular to a pyrochlore-type high-entropy oxide solidified body and a preparation method thereof. Background technique [0002] Nuclear energy is an efficient and clean energy, and nuclear technology is widely used in nuclear power, scientific research and military fields. However, with the development of the nuclear industry, the discharge of nuclear waste is increasing day by day, which seriously threatens the ecological environment of the earth and the survival of human beings. Therefore, the safe storage and disposal of radioactive waste has become one of the key issues to be solved urgently in the field of nuclear energy, which is also the key to further realize the possible sustainable development of nuclear energy. [0003] The usual disposal method is to directly immobilize radioactive waste in an inert matrix, and then store the solidified m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/49C04B35/495
CPCC04B35/49C04B35/495C04B35/50C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3244C04B2235/96
Inventor 张国军周林李飞刘吉轩
Owner DONGHUA UNIV
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