Plutonium purification and concentration method

A technology for plutonium nitrate and solution, which is applied in the field of purification and concentration of plutonium, can solve the problems of adverse effects of stripping effect, serious solvent radiolysis effect, reduction of plutonium stripping yield, etc., and achieves high stripping yield and concentration multiple, The effect of short time and simplified method steps

Active Publication Date: 2014-08-27
CHINA INSTITUTE OF ATOMIC ENERGY
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can increase the concentration of plutonium by about ten times, it also has the following disadvantages: (1) although the supplementary extraction step of uranium can further reduce the uranium content in the plutonium product liquid, it will reduce the stripping yield of plutonium, and As an important nuclear material, plutonium needs to be fully recovered
(2) When purifying and concentrating the plutonium nitrate solution, the plutonium concentration is high, and the plutonium releases a large amount

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Plutonium purification and concentration method
  • Plutonium purification and concentration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The purification and concentration of plutonium is carried out in a centrifugal extractor. This method includes two steps of extraction and stripping. The process flow of the method is as follows: figure 1 shown.

[0031] (1) Extraction

[0032] The Pu(IV) in the plutonium nitrate solution composed of 3.3g / L plutonium-3.5mol / L nitric acid is extracted into the organic phase 30% TBP-kerosene solution, while Pu(IV) is concentrated, Zr is further purified , Ru and other splinter elements; the volume of 30% TBP-kerosene is 1 / 4 of the plutonium nitrate solution. The number of extraction stages is 10. Then wash with 1mol / L nitric acid, the number of washing stages is 6.

[0033] (2) Stripping

[0034] Pu(Ⅳ) in 30% TBP-kerosene solution was reduced to Pu(Ⅲ) by using nitric acid solution containing dimethylhydroxylamine as a reducing agent, and Pu(Ⅲ) was back-extracted into the water phase, so that the plutonium nitrate solution was purified and concentrated. Wherein the v...

Embodiment 2

[0039] The same method and steps as in Example 1, except that the volume of 30% TBP-kerosene in step (1) is 1 / 3 of the plutonium nitrate solution, and the number of extraction stages is 11. Then wash with 1.5mol / L nitric acid, the number of washing stages is 7.

[0040] The volume of the nitric acid solution containing dimethylhydroxylamine in step (2) is 1 / 3 of the 30% TBP-kerosene solution. The number of stripping stages is 13, and the concentration of dimethyl hydroxylamine is 0.8mol / L.

[0041] Bench test results are: under the given process conditions, the plutonium extraction yield is 99.93%, the plutonium stripping yield is 99.98%, and the plutonium concentration in the concentrated plutonium nitrate solution is 30.5g / L.

Embodiment 3

[0043] The same method and steps as in Example 1, except that the volume of 30% TBP-kerosene in step (1) is 1 / 4 of the plutonium nitrate solution, and the number of extraction stages is 12. Then wash with 1.5mol / L nitric acid, the number of washing stages is 8.

[0044] The volume of the nitric acid solution containing dimethylhydroxylamine in step (2) is 1 / 3 of the 30% TBP-kerosene solution. The number of stripping stages is 14, and the concentration of dimethyl hydroxylamine is 1mol / L.

[0045] Bench test results are: under the given process conditions, the plutonium extraction yield is 99.91%, the plutonium stripping yield is 99.99%, and the plutonium concentration in the concentrated plutonium nitrate solution is 40.2g / L.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of fuel-short after-treatment and discloses a plutonium purification and concentration method. The method comprises the following steps: extracting tetravalent plutonium in a nitric acid solution into a 30% TBP (tributyl phosphate)-kerosene solution with relatively small volume for purification and concentration in a centrifugal extractor, reducing tetravalent plutonium into trivalent plutonium by using a dimethylhydroxylamine-containing nitric acid solution with relatively small volume, performing back extraction on trivalent plutonium, and further purifying and concentrating plutonium in a water phase. In the whole concentration process, a plutonium replenishment and extraction link is removed. The method is simple in step, short in time and small in solvent radiation effect; the plutonium back-extraction yield reaches up to 99.98% while the plutonium concentration is increased by more than 10 times.

Description

technical field [0001] The invention belongs to the technical field of spent fuel reprocessing, and in particular relates to a method for purifying and enriching plutonium. Background technique [0002] Plutonium products obtained from laboratory research or reprocessing plants are usually in the form of plutonium nitrate solutions. However, estimates of the final product storage price of plutonium show that it is more economical and safer to store plutonium dioxide than plutonium nitrate solution. Therefore, in order to facilitate storage, it is necessary to convert the plutonium nitrate solution into the solid form of plutonium dioxide. [0003] The conversion of plutonium nitrate solution into plutonium dioxide solid is usually carried out by plutonium nitrate precipitation with plutonium oxalate, and then filtering, drying and roasting the plutonium oxalate precipitate to obtain plutonium dioxide powder. In order to speed up the plutonium oxalate precipitation process,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22B60/04C22B3/40
CPCY02P10/20
Inventor 晏太红左臣郑卫芳鲜亮李传博
Owner CHINA INSTITUTE OF ATOMIC ENERGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap