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Preparation method of nuclear pure grade uranyl nitrate fine powder

A kind of uranyl nitrate fine powder and uranyl nitrate technology, which is applied in the field of preparation of nuclear-grade uranyl nitrate fine powder, can solve the problems of easy agglomeration of materials, long drying time, and damage to heat-resistant components, and achieve chemical composition Pure, good powder dispersion, and the effect of reducing energy consumption

Pending Publication Date: 2021-06-11
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder is prepared by normal pressure drying, the drying time is long, local overheating may cause damage to the heat-resistant components, and the material is easy to agglomerate; the boiling drying is used, the drying efficiency is high, but the proportion of fine powder after drying is large, and it is easy to be blown by hot air. Entrainment of fine powder causes material loss, and the drying chamber is not easy to clean

Method used

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Examples

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preparation example Construction

[0018] A kind of preparation method of nuclear pure grade uranyl nitrate fine powder, concrete steps are as follows: Step 1, metal uranium and its compound are oxidized to generate U 3 o 8 ; Step 2, put U 3 o 8 The powdered acid is dissolved to form a uranyl nitrate solution; step 3, the uranyl nitrate solution is freeze-dried to obtain a finished product.

[0019] The oxidation of metal uranium and its oxides to generate U 3 o 8 ; The metal uranium can be in the form of uranium ingots, car chips, powder, etc.; the uranium compound can be uranium oxides such as uranium dioxide and uranium trioxide. Among them, the calcination and oxidation of metal uranium and uranium compounds are carried out under the condition of feeding oxygen or air.

[0020] The calcination and oxidation reaction temperature T range of the metal uranium and uranium compound is 500°C≤T1≤1000°C, the reaction time t range is 3h≤t≤5h, until it is completely oxidized to U3O8 powder.

[0021] The U 3 o ...

Embodiment 1

[0033] Weigh 300g of metal uranium, oxidize it at an oxidation temperature of 750°C for 1 hour, add 300mL of nitric acid and 500ml of distilled water to the calcined and oxidized powder, let it stand for 2 hours after acid dissolution, and then filter for later use. Turn on the refrigeration device, place the prepared acid solution in the pre-freezing chamber, and set the temperature at -15°C. After the uranyl nitrate solution is frozen solid, transfer it to the drying chamber and quickly inflate it, then set the vacuum degree to 600Pa, and the temperature - 20°C, carry out the first step of dehydration, a large number of bubbles will be generated in about 3 minutes, the surface will bump violently, increase the vacuum degree after 0.5 hours, set it to 100Pa, temperature -60°C, dry for 1.5 hours, after the end of freeze-drying, slowly Increase the pressure in the freeze-drying chamber, and set the temperature to 40°C. After drying, loose and porous uranyl nitrate powder will be...

Embodiment 2

[0035] Weigh 300g of metal uranium, oxidize it at an oxidation temperature of 650°C for 1 hour, add 350mL of nitric acid and 600ml of distilled water to the calcined and oxidized powder, let it stand for 2 hours after acid dissolution, and then filter for later use. Turn on the refrigeration device, place the prepared acid solution in the pre-freezing chamber, and set the temperature at -25°C. After the uranyl nitrate solution is frozen solid, transfer it to the drying chamber and quickly inflate it, then set the vacuum degree to 550Pa, and the temperature - 30°C, carry out the first step of dehydration, a large number of bubbles will be generated in about 3 minutes, and the surface will bump violently. After 0.5 hours, increase the vacuum degree, set it to 50Pa, and the temperature is -65°C. Dry for 2 hours. Increase the pressure in the freeze-drying chamber and set the temperature to 45°C. After drying, loose and porous uranyl nitrate powder will be produced, and the exhaust ...

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Abstract

The invention belongs to a preparation method, and particularly relates to a preparation method of nuclear pure grade uranyl nitrate fine powder. The preparation method of nuclear pure grade uranyl nitrate fine powder comprises the following steps of 1, oxidizing metal uranium and a compound thereof to generate U3O8, 2, enabling U3O8 powder to be subjected to acid dissolution, and generating a uranyl nitrate solution, and 3, freezing and drying the uranyl nitrate solution to obtain a finished product. The method has the remarkable effects that the uranyl nitrate fine powder can be prepared from the uranyl nitrate solution by taking metal uranium and a compound thereof as raw materials and adopting a vacuum freeze drying method, and compared with the traditional normal-pressure drying and boiling drying, the vacuum low-temperature freeze drying can reduce the energy consumption and can be stored for a relatively long time at normal temperature; meanwhile, the powder prepared by the vacuum freeze-drying method is good in dispersity, the particle size ranges from 20 micrometers to 150 micrometers, chemical components are pure, and no hard agglomeration exists among particles.

Description

technical field [0001] The invention belongs to a preparation method, in particular to a preparation method of nuclear-grade uranyl nitrate fine powder. Background technique [0002] Uranyl nitrate is the starting point and an important constituent step of the nuclear chemical conversion process, and plays an important role in the reprocessing of nuclear waste and the separation of isotopes to prepare enriched uranium. The uranyl nitrate solution is dehydrated and converted into uranyl nitrate fine powder, so that the product can be stored at room temperature for a long time, and is light in weight and easy to transport. The powder is prepared by normal pressure drying, the drying time is long, local overheating may cause damage to the heat-resistant components, and the material is easy to agglomerate; the boiling drying is used, the drying efficiency is high, but the proportion of fine powder after drying is large, and it is easy to be blown by hot air. Entrainment of fine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/00
CPCC01G43/00C01P2004/61
Inventor 郭波龙侯丽红张凡王东昱李涛于晓波郭国俊
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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