Method and device for continuously adjusting neptunium valence and acidity in 1cu feed liquid in purex process

A technology of feed liquid and acidity, applied in the field of continuous adjustment of neptunium valence and acidity in 1CU feed liquid of Purex process, can solve the problems of batch operation and complicated steps, and achieve the effect of avoiding operation, simple process and short residence time.

Active Publication Date: 2022-07-01
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

Although this method successfully converts more than 99% of Np(IV) into Np(V), it has the disadvantages of batch operation and complicated steps.

Method used

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  • Method and device for continuously adjusting neptunium valence and acidity in 1cu feed liquid in purex process

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0054] Specific steps are as follows:

[0055] (1) Use negative pressure to extract a certain volume of 1CU feed liquid from the 1CU feed liquid tank, add a certain volume of nitric acid to keep the acidity in the tank at about 0.1mol / L, and add a certain concentration of Np(IV) feed liquid, Make the Np(IV) concentration in the tank at 2mg / L;

[0056] (2) Control the temperature of the heating coil to be 60°C, and use the feed liquid pump to deliver 1 CU of feed liquid to the heating coil at a certain flow rate, so that the residence time in the heating coil is 3 hours;

[0057] (3) After that, the 1CU feed liquid is cooled to 40°C through the cooling coil;

[0058] (4) Finally, according to the flow rate and acidity of the 1CU feed liquid, and the acidity of the final discharge-2DF, calculate the flow rate of the concentrated nitric acid that needs to be input in the static mixer, so that the treated 1CU feed liquid is statically mixed with the concentrated nitric acid. Mix...

experiment example 2

[0061] Specific steps are as follows:

[0062] (1) Use negative pressure to extract a certain volume of 1CU feed liquid from the 1CU feed liquid tank, add a certain volume of nitric acid to keep the acidity in the tank at about 0.5mol / L, and add a certain concentration of Np(IV) feed liquid, Make the Np(IV) concentration in the tank at 2mg / L;

[0063] (2) Control the temperature of the heating coil to be 90°C, and use the feed liquid pump to deliver 1 CU of feed liquid to the heating coil at a certain flow rate, so that the residence time in the heating coil is 0.5 hours;

[0064] (3) After that, the 1CU feed liquid is cooled to 40°C through the cooling coil;

[0065] (4) Finally, according to the flow rate and acidity of the 1CU feed liquid, and the acidity of the final discharge-2DF, calculate the flow rate of the concentrated nitric acid that needs to be input in the static mixer, so that the treated 1CU feed liquid is statically mixed with the concentrated nitric acid. M...

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Abstract

The invention relates to a method and a device for continuously adjusting the neptunium valence state and acidity in a 1CU feed liquid of a Purex process. The method comprises: adjusting the nitric acid concentration of the 1CU feed liquid to be 0.03-0.5mol / L; The neptunium in the liquid is oxidized to a high price; the 1CU feed liquid after the thermal insulation pretreatment is continuously cooled; the cooled 1CU feed liquid is continuously acid-adjusted to become the raw material liquid 2DF of the uranium purification cycle; in the above process, the heating and thermal insulation pretreatment The treatment process is carried out in the heating coil and the cooling process is carried out in the cooling coil to realize continuous production; the holding time of the heating and heat preservation pretreatment process is controlled by the flow rate of 1CU feed liquid, the diameter and length of the heating coil . The device includes a 1CU material and liquid temporary storage tank, a material and liquid transfer pump, a heating coil, a cooling coil and a static mixer. The beneficial effects of the present invention are as follows: the technical solution of the present invention can realize the continuous adjustment of neptunium valence state in 1CU, the process operation and control are very simple, and the tedious operation of the batch process is avoided.

Description

technical field [0001] The invention belongs to the field of nuclear fuel reprocessing, and in particular relates to a method and a device for continuously adjusting neptunium valence and acidity in a 1CU feed liquid of a Purex process. Background technique [0002] The Purex process is currently the main process used in reprocessing plants. The purpose of the uranium purification cycle is to purify and enrich the crude uranium product obtained from the co-decontamination cycle through the extraction process and the stripping process, and finally obtain a qualified uranium product. Neptunium is the main impurity element to be removed in the uranium purification cycle. Neptunium is mainly in the three valence states of Np(IV), Np(V), and Np(VI) in the solution, and they are transformed into each other. The behavior is very complex and very difficult. It is difficult to stabilize it in a certain valence state. The chemical behavior of different valence states is very differe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02C22B3/06
CPCC22B60/0295C22B3/065
Inventor 袁中伟左臣吕洪彬晏太红郑卫芳刘宁
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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