Technology method and device for preparing ammonium diuranate

A technology for the preparation of ammonium diuranate, which is applied in chemical instruments and methods, uranium compounds, inorganic chemistry, etc., to achieve the effects of easy self-control operation, less equipment, and short process

Inactive Publication Date: 2011-08-17
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic and foreign use the ADU method to produce ceramic grade UO on an industrial scale 2 In the field of powder technology, the continuous precipitation process is adopted, and ADU batch precipitation is used to prepare UO 2 The powder process has not yet formed industrial scale production. Compared with continuous precipitation, the ADU powder prepared by batch precipitation has higher conversion activity, which is more conducive to the preparation of UO with high sintering activity. 2 powder, so it is necessary to research and develop a new ADU batch precipitation process that can realize industrial scale production

Method used

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  • Technology method and device for preparing ammonium diuranate
  • Technology method and device for preparing ammonium diuranate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The batch precipitation preparation process of ammonium diuranate (ADU) according to the present invention can realize industrial-scale production, which includes the following steps:

[0026] (1) Preparation of raw material liquid: will be filled with UF 6 The vessel is heated to 70℃ to make UF 6 It is gasified and transported to the hydrolysis column via pipeline. Deionized water is added to the top of the hydrolysis column with UF 6 Reverse gas contact, hydrolysis reaction, UO with a uranium concentration of 100g / L 2 F 2 Solution

[0027] (2) ADU precipitation process: add 60 liters of UO with a uranium concentration of 100 g / L obtained in step (1) above 2 F 2 Add 25% by mass ammonia water to the solution to control NH 3 The molar ratio to U ion is 1:30, the ammonia addition time is 6 minutes, the reaction temperature is 35°C, and the precipitation time is 7 minutes, to obtain ADU slurry;

[0028] (3) Aging treatment: The ADU slurry obtained in the above step (2) is stirred ...

Embodiment 2

[0034] The batch precipitation preparation process of ammonium diuranate (ADU) according to the present invention can realize industrial-scale production, which includes the following steps:

[0035] (1) Preparation of raw material liquid: will be filled with UF 6 The vessel is heated to above 70℃ to make UF 6 It is gasified and transported to the hydrolysis column via pipeline. Deionized water is added to the top of the hydrolysis column with UF 6 Reverse gas contact, hydrolysis reaction, UO with a uranium concentration of 70g / L 2 F 2 Solution

[0036] (2) ADU precipitation process: add 20 liters of UO with a uranium concentration of 70 g / L obtained in step (1) above 2 F 2 Add 20% by mass ammonia water to the solution to control NH 3 The molar ratio to U ion is 1:24, the ammonia addition time is 3 minutes, the reaction temperature is 20°C, and the precipitation time is 3 minutes to obtain ADU slurry;

[0037] (3) Aging treatment: the ADU slurry obtained in the above step (2) is stirr...

Embodiment 3

[0043] The batch precipitation preparation process of ammonium diuranate (ADU) according to the present invention can realize industrial-scale production, which includes the following steps:

[0044] (1) Preparation of raw material liquid: will be filled with UF 6 The container is heated to above 70℃ to make UF 6 It is gasified and transported to the hydrolysis column via pipeline. Deionized water is added to the top of the hydrolysis column with UF 6 Reverse gas contact, hydrolysis reaction, UO with a uranium concentration of 130g / L 2 F 2 Solution

[0045] (2) ADU precipitation process: add 100 liters of UO with a uranium concentration of 130 g / L obtained in step (1) above 2 F 2 Add 28% by mass ammonia to the solution to control NH 3 The molar ratio to U ion is 1:34, the ammonia addition time is 10 minutes, the reaction temperature is 50°C, and the precipitation time is 10 minutes, to obtain ADU slurry;

[0046] (3) Aging treatment: the ADU slurry obtained in the above step (2) is st...

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Abstract

The invention provides a technology method and a device for preparing ammonium diuranate. The technology is used for preparing ADU (ammonium diuranate) with high conversion activity from UO2F2 solution which is prepared by hydrolyzing UF6 and serves as a raw material by performing an ADU precipitation reaction of the UO2F2 solution and ammonia in a reactor. In the technological process, ADU slurry which is formed after prior batch of precipitation is completed is used as detained ADU slurry; and the detained ADU slurry is added into the UO2F2 solution to start to carry out next precipitation batch. The ADU prepared by adopting the technical scheme of the invention has high conversion activity and can be used for preparing UO2 powder with high sintering activity. The invention also designsa device for the ADU precipitation technology. By the device, the ADU preparation technology can be ensured to be carried out safely. Meanwhile, the technology method has the advantages that the technology method has short process and little equipment and automatic control operation is convenient to realize, etc.

Description

Technical field [0001] The invention belongs to the technical field of preparation of PWR nuclear power fuel elements, and specifically relates to a preparation process and device of ammonium diuranate (ADU). Background technique [0002] The ADU method was the first to develop into an industrial-scale production of ceramic grade UO 2 The powder method has always dominated the production of oxide fuel elements in power reactors, and is still one of the main production methods in the world. [0003] The chemical formula of ammonium diuranate is usually written as (NH 4 ) 2 U 2 O 7 , But in fact it is a non-stoichiometric compound, the precipitation conditions are different, the chemical composition of the precipitate is also different, you can use the general formula (NH 4 ) 2 U n O 3n+1 Indicates that, in general, n is between 2 and 4. The reaction formula of ADU precipitation is as follows: [0004] 2UO 2 F 2 +6NH 3 ·H 2 O→(NH 4 ) 2 U 2 O 7 +4NH 4 F+3H 2 O [0005] The ADU precipita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/00
Inventor 武爱国李玉春王世波郧勤武杨光宇王雷段建军孙胜洪段永光
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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