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Low-temperature synthesis method for uranium nitride powder

A synthesis method, uranium nitride technology, applied in nitrogen compounds, nitrogen-metal/silicon/boron binary compounds, chemical instruments and methods, etc., can solve the problems of high impurity content in products, complicated process flow, high reaction temperature, etc. Achieve the effects of improving sintering activity, short process flow and low synthesis temperature

Active Publication Date: 2017-06-13
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
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  • Description
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AI Technical Summary

Benefits of technology

This patented technology allows for efficient manufacturing of high purity U-235 nuclear fuel pellets with minimal waste during their formation. By reducing the time needed by traditional methods like melting or solidification processes at lower temperatures, this new technique reduces power usage compared to current techniques while maintaining good quality products.

Problems solved by technology

This patents discuss various technical problem addressed during this patented research on reducing emissions from diesel engines into atmospheric levels due to their exhaust gases containing NOX produced when burning fossil fuels like coal. Existing techniques involve directly adding urea hydrochlorides onto combustion products without removing any remaining materials, resulting in increased costs associated with these treatments. Therefore there is a desire to develop new ways to reduce harmful emission caused by uzontroducer compounds present within engine coolants.

Method used

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  • Low-temperature synthesis method for uranium nitride powder
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  • Low-temperature synthesis method for 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

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Claims

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Application Information

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Owner CHINA INSTITUTE OF ATOMIC ENERGY
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