Application and method for extracting and separating uranium with amino-containing neutral phosphine extracting agent

An extraction agent, neutral phosphine technology, applied in the field of amino-containing neutral phosphine extraction agent, extraction and separation of uranium, can solve problems such as poor separation performance

Active Publication Date: 2017-03-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extractant used in this patent only has good separation ability of uranium and thorium in nitric acid medium, and has poor separation performance in other acidic medium

Method used

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  • Application and method for extracting and separating uranium with amino-containing neutral phosphine extracting agent
  • Application and method for extracting and separating uranium with amino-containing neutral phosphine extracting agent
  • Application and method for extracting and separating uranium with amino-containing neutral phosphine extracting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Preparation of the organic phase: Mix 3L of 1-(2-ethylhexylamino)methyl bis(2-ethylhexyl)phosphonate with 7L of aviation kerosene to prepare the organic phase.

[0085] The feed liquid is a sulfuric acid solution of 0.05mol / L uranium, and its acidity is 1.5mol / L.

[0086] The washing solution is 0.5mol / L sulfuric acid solution.

[0087] The stripping agent is 0.3mol / L ammonia solution.

[0088] A 250ml mixed-clarified extraction tank was used for extraction and separation experiments. First, 6-stage countercurrent extraction is carried out, and the flow ratio of the organic phase to the feed liquid is 10mL / min: 20mL / min to obtain the uranium-containing extract and uranium-extracted tail liquid. Then carry out 2-stage countercurrent washing, the flow ratio of uranium-containing extract and washing liquid is 10mL / min: 5mL / min. Then carry out 4-stage countercurrent stripping, the flow ratio of uranium-containing extract solution and stripping agent is 10mL / min: 3.5mL / mi...

Embodiment 2

[0090] Preparation of the organic phase: Mix 3L of 1-(2-ethylhexylamino)-ethylphosphonic acid bis(2-ethylhexyl) with 7L of aviation kerosene to prepare the organic phase.

[0091] The feed liquid is 0.5mol / L uranium hydrochloric acid solution, and its acidity is 1.0mol / L.

[0092] The washing solution is 0.5mol / L hydrochloric acid solution.

[0093] The stripping agent is 6mol / L hydrochloric acid solution.

[0094] A 250ml mixed-clarified extraction tank was used for extraction and separation experiments. First, 6-stage countercurrent extraction is carried out, and the flow ratio of the organic phase to the feed liquid is 10mL / min: 2mL / min to obtain the uranium-containing extraction liquid and the uranium extraction tail liquid. Then carry out 2-stage countercurrent washing, the flow ratio of the uranium-containing extraction solution and the washing solution is 10mL / min: 2mL / min. Then carry out 4-stage countercurrent back extraction, the flow ratio of the uranium-containin...

Embodiment 3

[0096] Preparation of the organic phase: Mix 2L of 1-(2-ethylhexylamino)1-ethylethylphosphonic acid bis(2-ethylhexyl), 1LCyanex 923 and 7L of aviation kerosene to prepare the organic phase.

[0097] The feed liquid is a nitric acid solution of 0.1mol / L uranium, and its acidity is 1.0mol / L.

[0098] The washing solution is 1.0mol / L nitric acid solution.

[0099] The stripping agent is 0.01mol / L nitric acid aqueous solution.

[0100] A 250ml mixed-clarified extraction tank was used for extraction and separation experiments. Firstly, 5-stage countercurrent extraction is carried out, and the flow ratio of the organic phase to the feed liquid is 10mL / min: 20mL / min to obtain the uranium-containing extraction liquid and the uranium extraction tail liquid. Then carry out 3-stage countercurrent washing, the flow ratio of the uranium-containing extraction solution and the washing solution is 10mL / min: 5mL / min. Then carry out 10 stages of countercurrent stripping, the flow ratio of th...

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Abstract

The invention relates to an application and method for extracting and separating uranium with an amino-containing neutral phosphine extracting agent. The formula is shown in the specification, wherein R1 and R2 are independently selected from C1-12 alkyl, R3 and R4 are independently selected from C1-5 alkyl and hydrogen, R5 and R6 are independently selected from C1-16 alkyl and hydrogen, and at most one of R5 and R6 is hydrogen. The amino-containing neutral phosphine extracting agent has good extracting and separating capacity to uranium in different acid media, the synthesis method is simple, chemical raw materials used for synthesis are simple and easy to obtain, cost is low, therefore, the extracting and separating cost of cerium can be effectively reduced, and high industrial application value is achieved. According to the method, liquid-liquid extraction and separation or solid-liquid extraction and separation is carried out on uranium in uranium-containing raw materials, the result shows that the purity of uranium obtained after extraction, washing and reextraction is 99% or above and the yield of uranium is 98% or above, and enrichment and purification of uranium are effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of uranium hydrometallurgy, and specifically relates to the use and method of an amino-containing neutral phosphine extractant for extracting and separating uranium. Background technique [0002] At present, the extraction of uranium in nitric acid medium mainly adopts TBP process. The TBP process is a method of extracting and separating uranium, thorium and rare earths in the solution by using tributyl phosphate as the extraction agent. Due to the high separation coefficient of TBP for impurities such as uranium and thorium and rare earth, this process is widely used in the field of hydrometallurgy technology. However, the extraction agent TBP has a large water solubility and is limited to a good separation ability of uranium and thorium in the nitric acid system, which limits its popularization and application. [0003] Monazite is a valuable resource rich in rare earth, thorium and uranium. The radioac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B60/02
CPCC22B60/026C22B3/382
Inventor 廖伍平张志峰李艳玲
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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