Method and device for continuously adjusting valence state and acidity of neptunium in Purex process 1CU feed liquid
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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 cumbersome steps, avoid operation, short residence time, and simple process operation and control. Effect
Active Publication Date: 2021-05-28
CHINA INSTITUTE OF ATOMIC ENERGY
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Although this method successfully converts more than 99% of Np(IV) into Np(V), it has the disadvantages of batch operation and complicated steps.
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experiment example 1
[0054] Specific steps are as follows:
[0055] (1) Use negative pressure to extract a certain volume of 1CU feed liquid in the 1CU feed liquid tank, add a certain volume of nitric acid, 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 a feed liquid pump to deliver 1CU of feed liquid to the heating coil with a certain flow rate, so that the residence time in the heating coil is 3 hours;
[0057] (3) After that, 1CU of feed liquid is cooled to 40°C through the cooling coil;
[0058] (4) Finally, according to the 1CU feed liquid flow rate and acidity, 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 and concentrated nitric acid are statically mixed It is mixed in the r...
experiment example 2
[0061] Specific steps are as follows:
[0062] (1) Use negative pressure to extract a certain volume of 1CU feed liquid in the 1CU feed liquid tank, add a certain volume of nitric acid, 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 a feed liquid pump to deliver 1CU of feed liquid to the heating coil with a certain flow rate, so that the residence time in the heating coil is 0.5 hour;
[0064] (3) After that, 1CU of feed liquid is cooled to 40°C through the cooling coil;
[0065] (4) Finally, according to the 1CU feed liquid flow rate and acidity, 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 and concentrated nitric acid are statically mixed It is mixed in the ...
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Abstract
The invention relates to a method and device for continuously adjusting the valence state and acidity of neptunium in a Purex process 1CU feed liquid. The method comprises the steps that the nitric acid concentration of the 1CU feed liquid is adjusted to be 0.03-0.5 mol / L; the 1CU feed liquid subjected to acid adjustment is subjected to heating and heat preservation continuous pretreatment to oxidize neptunium to the high valence; the 1CU feed liquid subjected to heat preservation pretreatment is continuously cooled; the cooled 1CU feed liquid is subjected to continuous acid adjustment to form raw material liquid 2DF for uranium purification circulation; in the process, the heating and heat preservation pretreatment process is carried out in a heating coil, and the cooling process is carried out in a cooling coil, so that continuous production is realized; the heat preservation time of the heating and heat preservation pretreatment process is controlled through the flow of the 1CU feed liquid as well as the diameter and length of the heating coil. The device comprises a 1CU feed liquid temporary storage tank, a feed liquid conveying pump, the heating coil, the cooling coil and a static mixer. The method and the device have the beneficial effects that according to the technical scheme, continuous adjustment of the valence state of neptunium in the 1CU can be achieved, process operation and control are very easy, and tedious operation of a batch process is avoided.
Description
technical field [0001] The invention belongs to the field of post-processing of nuclear fuel, and in particular relates to a method and a device for continuously adjusting the valence state and acidity of neptunium in 1CU feed liquid of the 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 products obtained from the co-decontamination cycle through the extraction process and stripping process, and finally obtain qualified uranium products. Neptunium is the main impurity element to be removed by the uranium purification cycle. Neptunium mainly has 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 complicated and very complex. It is difficult to stabilize it in a certain valence state. The chemical behavior of different valence states is ve...
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