Recovery method of palladium in spent fuel element fission product

A fission product and recovery method technology, applied in the field of resource utilization and environmental protection, can solve the problems of poor decontamination ability of actinides, lanthanides and transition metals, difficult selective separation of palladium, multiple operations of secondary wastes, etc. Achieve the effect of easy engineering scale-up, strong applicability, and high recovery yield

Active Publication Date: 2019-03-01
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in general, the above methods all include multiple precipitation and transfer steps, and there are generally problems such as low work efficiency, long separation cycle, more secondary waste and cumbersome operation.
At the same time, the methods established at this stage have poor decontamination ability for some actinides, lanthanides and transition metals, and it is difficult to directly realize the selective separation of palladium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (a) After shearing 1.0g of spent fuel element, dissolve it in 180 mL of mixed acid consisting of hydrofluoric acid, nitric acid, and perchloric acid (volume ratio: 5:3:2) at 300°C, and then Adjust the price with hydrogen peroxide, concentrate and evaporate to dryness to obtain a solid particle sample;

[0033] (b) Redissolve the solid particle sample obtained in step a in 8.0 mol / L nitric acid solution, concentrate and evaporate to near dryness, then add 15 mL of 1.0 mol / L hydrochloric acid solution until completely dissolved to obtain the column sample solution ;

[0034] (c) The upper column sample solution obtained by step b is transferred to the balanced commercial strong acid ion exchange resin column for separation. The length of this commercial strong acid ion exchange resin column is 30 cm, and the radius is 1 cm. The flow rate of the effluent is controlled to be 0.5 mL / min, collect the sample effluent;

[0035] (d) the sample effluent obtained in step c is tr...

Embodiment 2

[0038] The implementation of this example is basically the same as that of Example 1, the main difference being that the heating and dissolving temperature in step a is adjusted to 200°C and 350°C respectively, the recovery yield of palladium and the decontamination factor of interfering elements obtained are the same as those of the implementation Compared with Example 1, there was no significant change.

Embodiment 3

[0040] The implementation of this example is basically the same as Example 1, the main difference is that the volume of the mixed acid in step a is adjusted to 250 mL and 360 mL respectively, the recovery yield of palladium obtained and the decontamination factor of interfering elements are the same as those of the implementation Compared with Example 1, there was no significant change.

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Abstract

The invention discloses a recovery method of palladium in a spent fuel element fission product. According to the method, firstly, spent fuel element mixed acid is dissolved; then, the material sequentially passes through an extraction chromatographic column formed by serially connecting a cation exchange resin column and a nickel base chelating resin column; and through optimizing the column separation conditions, the selective enrichment of palladium in the spent fuel element fission product is finally realized. The recovery method of palladium in the spent fuel element fission product provided by the invention is economical; the environment-friendly effect is achieved; the process is simple; the applicability is high; the problems of complicated steps, low selectivity, high production cost, complicated operation and the like in the conventional palladium processing technique are solved; and the palladium can be fast and efficiently recovered from the spent fuel element fission product. The recovery method of palladium in the spent fuel element fission product disclosed by the invention has the advantages that the circulation reuse and engineering amplification can be easily realized, and the important practice significance is realized in the fields of radioactive waste management and wet metallurgy.

Description

technical field [0001] The invention belongs to the field of resource utilization and environmental protection, and in particular relates to a method for recovering palladium in fission products of spent fuel elements. Background technique [0002] Palladium is a rare precious metal. Its unique physical and chemical properties are widely used in the fields of catalysts, electrical components, hydrogen storage materials and medical molds. However, the content of natural palladium in the earth's crust is extremely low, making it difficult to meet the growing demand of various industries. For this reason, the active development of economical, green and efficient separation technology or the search for new palladium resources have become the focus of scientific research workers. [0003] In recent years, with the aggravation of energy shortage and environmental pollution, nuclear energy has developed rapidly as a clean and low-carbon new energy. However, a large amount of radi...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B11/046Y02P10/20
Inventor吴奉承杨楚汀韩军胡胜罗阳明刘易
OwnerINST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF