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A kind of high activity uranium nitride powder manufacturing process

A manufacturing process and uranium nitride technology, which is applied in the field of nuclear engineering, can solve the problems of complex preparation process, poor powder activity and small particle size, and achieves the effects of good activity, easy oxidation and small particle size.

Inactive Publication Date: 2018-07-31
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem solved by the invention: overcomes the shortcomings of the existing uranium nitride powder preparation technology, such as complex preparation process of ultra-fine metal uranium powder, high energy consumption, poor powder activity, etc., and proposes a process for preparing uranium nitride by electric explosion method , through the electric explosion of metal uranium wire in a high-purity nitrogen environment, a mixture of ultra-fine metal uranium powder and uranium nitride powder is obtained, and the mixture is further nitrided at high temperature to obtain uranium nitride powder with small particle size and high activity

Method used

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  • A kind of high activity uranium nitride powder manufacturing process

Examples

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Effect test

Embodiment 1

[0027] Embodiment 1: according to figure 1 The process flow shown prepares uranium nitride, and the specific process is as follows:

[0028] (1) After taking out the metal uranium wire with a diameter of about 0.3mm sealed and stored, put it into the electric explosion experimental device;

[0029] (2) Carry out evacuation and nitrogen filling to the electric explosion vessel for 3 times, the purity of the filled nitrogen is 99.99%, and the oxygen impurity content in the nitrogen is less than 10ppm;

[0030] (3) Set the voltage of the electric explosion experimental device to 40KV, and the frequency of electric explosion to 1 time / min;

[0031] (4) Start the electric explosion experimental device, and complete the electric explosion of metal uranium wire under nitrogen environment;

[0032] (5) Seal and collect the mixture of uranium powder and uranium nitride powder generated in the electric explosion experimental device;

[0033] (6) Fill nitrogen and heat the mixture of ...

Embodiment 2

[0034] Example 2: Adjust the voltage of the electric explosion experiment device to 45KV, and the frequency of electric explosion to 2 times / min. High-activity uranium nitride powder is also obtained, and the pellet density after powder pressing and sintering is greater than 90%. Specific steps are as follows:

[0035] (1) After taking out the metal uranium wire with a diameter of about 0.3mm sealed and stored, put it into the electric explosion experimental device;

[0036] (2) Carry out evacuation and nitrogen filling to the electric explosion vessel for 3 times, the purity of the filled nitrogen is 99.99%, and the oxygen impurity content in the nitrogen is less than 10ppm;

[0037] (3) The voltage of the electric explosion experimental device is set to 45KV, and the frequency of electric explosion is 2 times / min;

[0038] (4) Start the electric explosion experimental device, and complete the electric explosion of metal uranium wire under nitrogen environment;

[0039] (5)...

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Abstract

The invention provides a manufacturing technique of high-activity uranium nitride powder. The manufacturing technique comprises the following steps: electrically blasting metal uranium wire under a high-purity nitrogen environment, enabling the metal uranium to chemically react with the nitrogen in the blasting process, thereby generating the mixture of ultrafine uranium powder and uranium nitride powder; and enabling the mixture to react with the nitrogen at high temperature to obtain the uranium nitride. The manufacturing technique provided by the invention has the advantages of being low in energy consumption, and the prepared uranium product is good in activity.

Description

technical field [0001] The invention relates to a high-activity uranium nitride powder manufacturing process, which is suitable for the preparation of uranium nitride nuclear fuel and belongs to the field of nuclear engineering. Background technique [0002] Uranium nitride fuel has excellent properties such as high uranium density, high thermal conductivity, high temperature stability, and good compatibility with liquid metal. Internationally, in the planning of the fourth generation nuclear energy system, uranium nitride fuel has been used as an important candidate fuel for lead-cooled block reactors and sodium-cooled fast reactors. [0003] Although uranium nitride fuel has excellent service performance in reactors, the preparation technology of uranium nitride fuel is relatively complicated. Among the existing technical routes for the preparation of uranium nitride fuel, the direct nitridation of metal uranium is one of the main research methods. Its advantages are high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/06B21C37/04
CPCB21C37/047C01B21/063C01P2004/61C01P2006/80
Inventor 梅华平吴庆生陈建伟刘少军黄群英吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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