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Low Temperature Synthesis of Uranium Nitride Powder

A synthesis method, uranium nitride technology, applied in the direction of nitrogen compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high impurity content in products, complex process flow, high reaction temperature, etc., to improve sintering activity and shorten the process flow , the effect of low synthesis temperature

Active Publication Date: 2018-10-09
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] In order to solve the problems of high reaction temperature and high energy consumption in the existing uranium nitride powder synthesis process, and to overcome the defects of high impurity content in the product or complicated process flow, the invention provides a low-temperature process for uranium nitride powder Synthetic method, this synthetic method comprises the following steps:

Method used

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  • Low Temperature Synthesis of Uranium Nitride Powder
  • Low Temperature Synthesis of Uranium Nitride Powder
  • Low Temperature Synthesis of Uranium Nitride Powder

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Preparation of metal uranium powder

[0046] Step 1: Introduce hydrogen gas into the reaction furnace with 238g of uranium metal, raise the temperature in the reaction furnace to 225°C, and keep it warm for 16 hours so that the metal uranium and hydrogen fully react to form uranium hydride powder; then increase the temperature in the reaction furnace To 550°C, continue to vacuumize the reaction furnace and keep it warm for 1.5h to dehydrogenate the uranium hydride powder into metal uranium powder, then stop the vacuuming;

[0047] The second step: repeat the operation of the first step twice;

[0048] (2) Quantitative nitriding synthesis of uranium nitride powder

[0049] Raise the temperature in the reaction furnace to 700°C, feed 0.1MPa nitrogen gas through the gas supply device, control the gas flow rate below 1L / min through the mass flow meter on the gas supply device, and rely on the mass flow meter to record the total amount of nitrogen gas introduced, Make ...

Embodiment 2

[0051] (1) Preparation of metal uranium powder

[0052] Step 1: Introduce hydrogen gas into the reaction furnace with 238g of uranium metal, raise the temperature in the reaction furnace to 255°C, and keep it warm for 8 hours to fully react the metal uranium and hydrogen to form uranium hydride powder; then increase the temperature in the reaction furnace To 650 ℃, continue to vacuumize the reaction furnace, and keep it warm for 1h, so that the uranium hydride powder is dehydrogenated and converted into metal uranium powder, and then stop vacuuming;

[0053] The second step: Repeat the operation of the first step 5 times;

[0054] (2) Quantitative nitriding synthesis of uranium nitride powder

[0055] Raise the temperature in the reaction furnace to 500°C, feed 0.15MPa nitrogen through the gas supply device, control the gas flow rate below 0.2L / min through the mass flow meter on the gas supply device, and rely on the mass flow meter to record the total amount of nitrogen gas ...

Embodiment 3

[0057] (1) Preparation of metal uranium powder

[0058] Step 1: Introduce hydrogen gas into the reaction furnace with 238g of uranium metal, raise the temperature in the reaction furnace to 275°C, and keep it warm for 24 hours to fully react the metal uranium and hydrogen to form uranium hydride powder; then increase the temperature in the reaction furnace To 750 ℃, continue to vacuumize the reaction furnace, and keep it warm for 2 hours, so that the uranium hydride powder is dehydrogenated and converted into metal uranium powder, and then stop vacuuming;

[0059] The second step: Repeat the operation of the first step 3 times;

[0060] (2) Quantitative nitriding synthesis of uranium nitride powder

[0061] Raise the temperature in the reaction furnace to 800°C, feed 0.2MPa nitrogen through the gas supply device, control the gas flow rate below 2L / min through the mass flow meter on the gas supply device, and rely on the mass flow meter to record the total amount of nitrogen g...

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Abstract

The invention belongs to the field of nuclear fuel preparation and provides a low-temperature synthesis method for uranium nitride powder for solving the problems that an existing uranium nitride powder synthesis technology is over-high in reaction temperature, high in product impurity content or complicated in technological process. The synthesis method comprises the following steps: (1) enabling metallic uranium to fully react with hydrogen to generate uranium hydride powder, increasing the temperature and lastingly vacuumizing to dehydrogenize and convert the uranium hydride powder into metallic uranium powder, and repeating for multiple times; and (2) carrying out quantitative reaction on the metallic uranium powder and nitrogen at a high temperature to prepare the uranium nitride powder. The low-temperature synthesis method for the uranium nitride powder has the advantages of short technological process and low synthesis temperature; the production energy consumption can be significantly reduced; the synthesized uranium nitride powder is small in particle size, low in impurity content and beneficial to improvement of the sintering activity of the uranium nitride powder.

Description

technical field [0001] The invention belongs to the field of nuclear fuel preparation, in particular to a low-temperature synthesis method of uranium nitride powder. Background technique [0002] In the field of reactors, the most widely used nuclear fuel is oxide fuel, such as UO 2 fuel and MOX (mixed oxide UO 2 -PuO 2 ) fuels, but countries around the world have not stopped research and development of other types of fuels, including nitrides, carbides, silicides, metals, etc. Among them, nitride fuel has the advantages of high uranium density, high melting point, high thermal conductivity, low thermal expansion coefficient, good radiation stability, low fission gas release rate, and good compatibility with liquid metal coolants, etc., and has become the focus of attention. type of fuel. [0003] In the field of large metal-cooled fast reactors, Russia took the lead in using nitride fuel in the design of BN-1200 sodium-cooled fast reactor and BREST lead-cooled fast reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/58
CPCC01B21/063C01P2002/72G21C3/58Y02E30/30
Inventor 屈哲昊尹邦跃
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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