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Detergent for ammonium diuranate, and method for deflorinating ammonium diuranate

A technology of ammonium diuranate and detergent, which is applied in chemical instruments and methods, uranium compounds, inorganic chemistry, etc., can solve the problems of oxide film passivation, corrosion damage, and reducing the safe operation and life of nuclear fuel, so as to reduce the Blunt, reduced corrosion damage, easy to achieve effect

Active Publication Date: 2017-05-31
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason is: on the one hand, F is a strong corrosive agent, and the high content of F in ADU will cause strong corrosion damage to the fuel preparation process equipment; on the other hand, F in nuclear fuel may cause the oxidation film on the inner surface of the fuel element cladding to decrease blunt, which induces and promotes the hydrogen embrittlement of the cladding and reduces the safe operation and lifespan of nuclear fuel

Method used

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  • Detergent for ammonium diuranate, and method for deflorinating ammonium diuranate

Examples

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Effect test

Embodiment 1

[0026] A detergent for ammonium diuranate comprising ammonium carbonate and hydrogen peroxide.

[0027] In this scheme, ammonium carbonate is used as a buffer to prevent the dissolution of ammonium diuranate; hydrogen oxide and UO 2 2- Strong ion coordination ability, can replace F ion in ammonium diuranate to achieve the technical effect of washing and defluorination. That is, the program provides a solute solution including ammonium carbonate and hydrogen peroxide as a detergent, which contains and UO 2 2- The ionic components with strong coordination ability can effectively remove the fluorine ions in ADU by washing the ADU filter cake with a certain washing method to reduce the fluorine content in ADU. The mass fraction of fluorine in ADU after the traditional ADU defluorination method is About 3%, the mass fraction of fluorine in the ADU can be reduced to 0.7% or less after washing by the detergent, and the buffer provides technical guarantee for the optimization of th...

Embodiment 2

[0029] This embodiment is further limited on the basis of Example 1: the detergent is mixed by ammonium carbonate solution and hydrogen peroxide solution, and the volume ratio ratio of ammonium carbonate solution and hydrogen peroxide solution is 1.5 to 3, the mass of ammonium carbonate solution The percentage concentration is 8%-10%, and the mass percentage concentration of the hydrogen peroxide solution is 3%-5%. In this scheme, the hydrogen peroxide solution is the aqueous solution of hydrogen peroxide. The limitation of the amount of ammonium carbonate and hydrogen peroxide in the detergent can make the detergent provided in this case able to ensure the stable existence of ammonium diuranate in the washing environment. Obtain higher washing defluorination ability.

[0030] As a preferred proportioning mode, the volume ratio ratio of the ammonium carbonate solution and the hydrogen peroxide solution is 2. Using the detergent provided by this solution, after one wash, the m...

Embodiment 3

[0032] Such as figure 1 As shown, this embodiment provides a method for defluorination of sodium oleate: at the same time, the present invention also discloses a method for defluorination of ammonium diuranate, which uses any of the detergent solutions provided above for A defluorination wash for ammonium diuranate comprising the following steps in sequence:

[0033] S1. Mix ammonium diuranate with the detergent, so that the ammonium diuranate is dispersed in the detergent to obtain a mixture A;

[0034] S2. The mixture A is filtered, and the filter cake obtained by filtering is ammonium diuranate after defluorination.

[0035] The above method provided in this case is simple to operate and can effectively wash out the fluoride ions in ADU. The fluorine content in ADU can be reduced to 0.7% after washing.

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Abstract

The invention discloses a detergent for ammonium diuranate, and a method for deflorinating ammonium diuranate. The detergent containing an ionic component having strong binding capacity with UO2<2+> can efficiently wash out fluorine ions in ADU, 5% by mass percentage of fluorine contained in ADU prepared from UO2F2 is reduced to 0.7%, therefore, after the intermediate ammonium diuranate during preparation of nuclear fuel is treated by using the detergent, the corrosion damage of fluorine to fuel preparation technology equipment can be effectively reduced, and in addition, the content of fluorine in the obtained nuclear fuel is less, so that the obtuse reduction situation of surface oxidized films in fuel element claddings caused by fluorine can be effectively avoided or relieved. In addition, the invention discloses a method for deflorinating ammonium diuranate. By adopting the method, the purposes can be effectively realized, in addition, the method also has the advantages of being simple to operate and easy to realize compared with the existing nuclear fuel deflorination technology.

Description

technical field [0001] The invention relates to the technical field of nuclear material manufacture, in particular to a detergent for ammonium diuranate and a method for defluorinating ammonium diuranate. Background technique [0002] In the preparation of nuclear fuel (UO 2 Pellet fuel, high burnup UO 2 Ammonium diuranate (ADU) is an important intermediate product in the process of spherical fuel, etc. It is desirable to control the F content at a low level in the intermediate products of nuclear fuel preparation and in nuclear fuel. The reason is: on the one hand, F is a strong corrosive agent, and the high content of F in ADU will cause strong corrosion damage to the fuel preparation process equipment; on the other hand, F in nuclear fuel may cause the oxidation film on the inner surface of the fuel element cladding to decrease Blunt, which induces and promotes the hydrogen embrittlement of the cladding, and reduces the safe operation and service life of nuclear fuel. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/00
CPCC01G43/00C01P2006/80
Inventor 龙弟均刘锦洪张勇曾诚
Owner NUCLEAR POWER INSTITUTE OF CHINA
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