Recovery method for uranium

A recovery method and technology of aqueous acid solution, applied in the field of uranium recovery, can solve the problems of low recovery rate of uranium and many extraction stages, and achieve the effect of high recovery rate and high impurity metal ion decontamination coefficient

Active Publication Date: 2017-04-05
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a uranium recovery method in order to overcome the defects of relatively low uranium recovery rate and many extraction stages in the existing method for recovering uranium from thorium-based spent fuel

Method used

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  • Recovery method for uranium
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Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1) Using kerosene as an organic solvent, prepare an organic solution with a volume concentration of 1% methylphosphonate bis(1-methyl)heptyl ester as an extractant to prepare an organic solution containing Th 4+ , UO 2 2+ , Zr 4+ , Nb 5+ , Ru(RuNO 3+ ), Rh 3+ , Sr 2+ , Cs + , Ce 3+ , Ce 4+ , Gd 3+ , Dy 3+ 的2M nitric acid aqueous solution, where Th 4+ , UO 2 2+ The concentration is 50g / L, 0.5g / L, and the concentration of other metal ions is 5ppm. As the feed liquid, prepare 0.5M nitric acid aqueous solution as the washing liquid. The extractant, the feed liquid and the washing liquid are fractionated and extracted in the mixed clarification tank , The number of extraction stages is 8, the number of washing stages is 6, and the ratio of material liquid, extractant, and washing liquid is 1:2:1. Uranium will be extracted into the organic equivalent, while thorium and impurity metal ions remain in the water phase;

[0028] 2) Using pure water as the stripping liquid, the organic...

Embodiment 2

[0031] 1) Use kerosene as the organic solvent to prepare an organic solution with a volume concentration of 2% methylphosphonate bis(1-methyl)heptyl ester as an extractant to prepare an organic solution containing Th 4+ , UO 2 2+ , Zr 4+ , Nb 5+ , Ru(RuNO 3+ ), Rh 3+ , Sr 2+ , Cs + , Ce 3+ , Ce 4+ , Gd 3+ , Dy 3+ 的1M nitric acid aqueous solution, where Th 4+ , UO 2 2+ The concentration is 50g / L, 0.5g / L, and the concentration of other metal ions is 5ppm. As the feed liquid, a 1.5M nitric acid aqueous solution is prepared as the washing liquid. The extractant, the feed liquid and the washing liquid are fractionated and extracted in the mixed clarification tank The number of extraction stages is 9 and the number of washing stages is 7. The ratio of material liquid, extractant, and washing liquid is 1:2:1. Uranium will be extracted into the organic equivalent, while thorium and impurity metal ions remain in the water The concentration distribution of thorium and uranium in the organi...

Embodiment 3

[0036] 1) Using kerosene as an organic solvent, prepare an organic solution with a volume concentration of 3% bis(1-methyl)heptyl methylphosphonate as an extractant to prepare an organic solution containing Th 4+ , UO 2 2+ , Zr 4+ , Nb 5+ , Ru(RuNO 3+ ), Rh 3+ , Sr 2+ , Cs + , Ce 3+ , Ce 4+ , Gd 3+ , Dy 3+ 的1M nitric acid aqueous solution, where Th 4+ , UO 2 2+ The concentration is 50g / L, 0.5g / L, and the concentration of other metal ions is 5ppm. As the feed liquid, a 0.2M nitric acid aqueous solution is prepared as the washing liquid. The extractant, the feed liquid and the washing liquid are fractionated and extracted in the mixed clarification tank , The extraction stage is 6 stages, the washing stage is 6 stages, and the ratio of feed liquid, extractant, and washing liquid is 1:1:2. Uranium will be extracted into the organic equivalent, while thorium and impurity metal ions remain in the water phase;

[0037] 2) With 0.01M nitric acid aqueous solution as the back extraction li...

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Abstract

The invention discloses a recovery method for uranium. The recovery method disclosed by the invention comprises the following steps of: 1) performing fractional extraction to obtain an organic phase containing uranium by taking an acidic aqueous solution containing thorium and uranium, an organic solvent containing methyl diheptyl (1-methyl) phosphonate as an extraction agent and an acidic aqueous solution as a washing liquid, wherein the volume concentration of the methyl diheptyl (1-methyl) phosphonate in the extraction agent is 1-6%; and 2) counter-extracting the organic phase containing uranium obtained in the step 1) by way of multistage countercurrent. According to the recovery method disclosed by the invention, the recovery rate of uranium is relatively high, the extraction stages are few, and the efficiency is relatively high.

Description

Technical field [0001] The invention relates to a method for recovering uranium. Background technique [0002] Thorium is one of the important elements in nuclear energy research and development. It can absorb neutrons and transform into fissionable nuclide U-233 for nuclear fission reaction. Therefore, thorium is a very promising nuclear fuel. For the post-processing of thorium-based nuclear fuel, it is necessary to recover and separate the unburned thorium and uranium for recycling in order to achieve full utilization of resources. [0003] For the post-processing of thorium-based spent fuel, the purpose of the treatment can be to separate and recover thorium and uranium from the spent fuel at the same time to obtain thorium and uranium products, or to separately recover the fissile material U-233 from the spent fuel, and finally obtain only Uranium products, thorium and fission products are disposed of as waste. Regarding the thorium-based spent fuel treatment process that sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B7/00
CPCC22B7/006C22B60/026C22B60/0291Y02P10/20
Inventor 张岚李峥李瑞芬刘春霞何淑华赵皓贵李晴暖于婷
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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