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Preparation technology of neptunium oxide target pellet

A preparation process and neptunium oxide technology, which is applied in the field of neptunium oxide target pellet preparation technology, can solve the problems of complex process, low loading and high production cost, and achieve the effects of simple process flow, low cost and high neutron utilization rate.

Active Publication Date: 2017-06-13
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low overall neptunium loading, high production cost and complicated process in the existing neptunium oxide target preparation process, the present invention provides a neptunium oxide target pellet preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Take neptunium oxide powder and magnesium oxide powder as the raw materials of the target pellets as needed, where the mass of the magnesium oxide powder accounts for 1% of the total mass of the two;

[0020] (2) In the neptunium oxide powder, take out the neptunium oxide powder with the same mass as the magnesium oxide powder, and mix the taken out neptunium oxide powder with the magnesium oxide powder in a three-dimensional motion mixer for 6 hours to obtain the initial mixed powder ;

[0021] (3) Add the remaining neptunium oxide powder and stearic acid into the three-dimensional motion mixer, and continue to mix them with the aforementioned initial mixed powder for 3 hours to obtain a mixed powder; among them, the added amount of stearic acid accounts for the total neptunium oxide powder and oxidized powder 0.2 of the total mass of magnesium powder;

[0022] (4) Using a hydraulic press in the glove box to cold press the mixed powder at a pressure of 350 MPa, and hold ...

Embodiment 2

[0025] (1) Take neptunium oxide powder and magnesium oxide powder as the raw materials of the target pellets as needed, wherein the mass of the magnesium oxide powder accounts for 5% of the total mass of the two;

[0026] (2) In the neptunium oxide powder, take out the neptunium oxide powder that accounts for 0.5 times the mass of the magnesium oxide powder, and mix the taken out neptunium oxide powder with the magnesium oxide powder in a three-dimensional motion mixer for 4 hours to obtain an initial mix powder;

[0027] (3) Add the remaining neptunium oxide powder and stearic acid into the three-dimensional motion mixer, and continue to mix them with the aforementioned initial mixed powder for 2 hours to obtain a mixed powder; among them, the added amount of stearic acid accounts for the total neptunium oxide powder and oxidized powder 0.4 of the total mass of magnesium powder;

[0028] (4) Using a hydraulic press in the glove box to cold press the mixed powder at a pressure of 40...

Embodiment 3

[0031] (1) Take neptunium oxide powder and magnesium oxide powder as the raw materials of the target pellets as required, where the mass of the magnesium oxide powder accounts for 10% of the total mass of the two;

[0032] (2) In the neptunium oxide powder, take out the neptunium oxide powder that accounts for 4 times the mass of the magnesium oxide powder, and mix the taken out neptunium oxide powder with the magnesium oxide powder in a three-dimensional motion mixer for 8 hours to obtain an initial mix powder;

[0033] (3) Add the remaining neptunium oxide powder and stearic acid into the three-dimensional motion mixer, and continue to mix them with the aforementioned initial mixed powder for 5 hours to obtain a mixed powder; among them, the added amount of stearic acid accounts for the total neptunium oxide powder and 0.6 of the total mass of magnesium powder;

[0034] (4) Using a hydraulic press in the glove box to cold press the mixed powder at a pressure of 600 MPa, and hold t...

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Abstract

The invention belongs to the field of nuclear material preparation and provides a preparation technology of a neptunium oxide target pellet for solving the problems that an existing preparation technology of a neptunium oxide target is relatively low in overall neptunium loading capacity, relatively high in production cost and relatively complicated in process. The technology comprises the following steps: (1) taking neptunium oxide powder and magnesium oxide powder as a target pellet material; (2) taking out part of neptunium oxide powder and mixing with the magnesium oxide powder to obtain preliminarily mixed powder; (3) adding the remaining neptunium oxide powder and further mixing with stearic acid to obtain mixed powder; (4) carrying out cold press molding to prepare a target pellet body; and (5) carrying out pressureless sintering to prepare the neptunium oxide target pellet. The preparation technology has the advantages of being simple in technological process and low in cost; the prepared neptunium oxide target pellet is high in overall neptunium loading capacity and high in neutron utilization rate, has relatively high thermal conductivity and good in-pile irradiation performance, and is convenient to chemically dissolve and extract and suitable for massive production of 238Pu fuel.

Description

Technical field [0001] The invention belongs to the field of nuclear material preparation, and particularly relates to a process for preparing neptunium oxide target pellets. Background technique [0002] 238 Pu is an important nuclear material in the field of space nuclear energy and an ideal fuel for radioisotope power and heat sources required for space activities. Take the United States as an example. In its space exploration missions in the past 60 years, 42 radioisotope power systems on board spacecraft launched by it have selected 238 Pu is used as fuel. [0003] Currently, 238 Pu production is mainly through irradiation in the reactor 237 The principle of Np is as follows: 237 Np is produced by (n, γ) reaction under neutron irradiation 238 Np nuclide, produced 238 Np is produced by beta decay 238 Pu. [0004] Based on the above principles, the Savannah River Laboratory in the United States developed NpO 2 -Al dispersion target preparation process (Note: Np refers specificall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/02G21C3/62C04B35/51C04B35/622
CPCC04B35/51C04B35/622C04B2235/3206C04B2235/9607G21C3/623G21C21/02Y02E30/30
Inventor 尹邦跃屈哲昊郑新海
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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