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Method and device for oxidative adjustment of plutonium valence with NOx

A valence and oxidant technology, applied in the field of NOx oxidation to adjust plutonium valence, can solve the problems of low utilization rate and unstable pressure, and achieve the effect of improving utilization rate, stable pressure and reducing disposal burden.

Inactive Publication Date: 2014-07-02
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device has pressure instability in the Pu(Ⅲ) oxidation column and N 2 o 4 The disadvantages of low utilization rate

Method used

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  • Method and device for oxidative adjustment of plutonium valence with NOx
  • Method and device for oxidative adjustment of plutonium valence with NOx

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Embodiment 1

[0031] NO x A method for adjusting the valence state of plutonium by oxidation. The method uses NOx and oxygen-containing gas as an oxidant to destroy the reducing agent in the Pu(III) feed solution and oxidizes Pu(III) to Pu(IV). The gas containing oxygen is air, and the amount of air admitted is twice that of NOx. The composition of NOx is as follows:

[0032]

Embodiment 2

[0034] The method is the same as in Example 1, except that the gas containing oxygen used is oxygen, and the amount of oxygen introduced is 0.5 times that of NOx.

Embodiment 3

[0036] NO x A device for adjusting the valence state of plutonium by oxidation, the device includes a Pu(III) oxidation column 4 and a nitrous acid removal column 7, the Pu(III) oxidation column 4 is connected to the nitrous acid removal column 7 through a feed liquid delivery pipe 12 at the upper part, The key is that the first tail gas discharge port 5 and the second tail gas discharge port 6 are respectively placed on the top of the Pu(Ⅲ) oxidation column 4 and the nitrous acid removal column 7, and the lower part of the Pu(Ⅲ) oxidation column 4 is provided with an oxidant inlet 2 and Pu (Ⅲ) feed liquid inlet 3, the lower part of the nitrous acid removal column 7 is equipped with an air inlet 8, and the bottom is connected with the feed liquid storage tank 10, wherein the oxidant is a mixture of NOx and oxygen-containing gas, and NOx is N 2 o 4 , NO 2 , NO, or a mixture of any two or three, and the gas containing oxygen is air.

[0037] The oxidant inlet 2 is located bel...

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Abstract

The invention belongs to the technical field of post treatment of nuclear fuels, and discloses a method and device for oxidative adjustment of plutonium valence with NOx. According to the method, NOx and oxygen-containing gas are used as oxidants to destroy a reducing agent in Pu (III) liquid and oxidize Pu (III) into PU (IV); the device comprises a Pu (III) oxidation column and a nitrous acid dispelling column, wherein the upper part of the Pu (III) oxidation column is connected with the nitrous acid dispelling column through a liquid delivery pipe; the device is characterized in that a first exhaust discharge port and a second exhaust discharge port are formed in the top ends of the Pu (III) oxidation column and the nitrous acid dispelling column respectively, and an oxidant inlet and a Pu (III) liquid inlet are formed in the lower part of the Pu (III) oxidation column. The method and the device have the advantages of improving the utilization rate of NOx, stabilizing the pressure in the Pu (III) oxidation column and lightening the treatment burden of nitrogen oxide exhaust.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel reprocessing, and in particular relates to a NO x A method and device for adjusting the valence state of plutonium by oxidation. Background technique [0002] The post-treatment process currently being studied (Purex, APOR process, etc.) usually uses reducing agents such as U(IV)-hydrazine, hydroxylamine-hydrazine or N,N-dimethylhydroxylamine-methylhydrazine to reduce and strip Pu(Ⅲ) , the plutonium in the 1BP feed solution obtained after the separation of uranium and plutonium is trivalent. Before the purification and concentration of plutonium by extraction-stripping in the next step, Pu(III) needs to be adjusted to Pu(IV); at the same time, the Pu(III) nitrate solution obtained from the plutonium purification cycle also needs to be converted into Pu during the precipitation conversion step (Ⅳ). In addition, it is necessary to remove the remaining nitrous acid from the reaction in the sy...

Claims

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Application Information

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IPC IPC(8): C01G99/00
Inventor 何辉常尚文周贤明李高亮兰天孟照凯陈志旭
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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