Use and method of amino-containing neutral phosphine extractant for extracting and separating uranium

An extractant and neutral phosphine technology, which is applied in the field of amino-containing neutral phosphine extractant, extraction and separation of uranium, and can solve the problems of poor separation performance

Active Publication Date: 2018-08-03
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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  • Use and method of amino-containing neutral phosphine extractant for extracting and separating uranium
  • Use and method of amino-containing neutral phosphine extractant for extracting and separating uranium
  • Use and method of amino-containing neutral phosphine extractant for extracting and separating uranium

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 present invention relates to the use and method of an amino-containing neutral phosphine extractant of the following general formula I for extracting and separating uranium, wherein R1 and R2 are each independently selected from C1-12 alkyl groups; R3 and R4 are each independently selected from C1 -5 alkyl and hydrogen, R5 and R6 are each independently selected from C1-16 alkyl and hydrogen, and at most one of R5 and R6 is hydrogen. The amino-containing neutral phosphine extractant used in the present invention not only has a good extraction and separation ability for uranium in different acid media, but also has a simple synthesis method, and the chemical raw materials used in the synthesis are simple and easy to obtain, and the cost is low, so that the uranium can be effectively reduced. The cost of extraction and separation has high industrial application value. According to the method of the present invention, liquid-liquid extraction separation or solid-liquid extraction is used to separate uranium in uranium-containing raw materials. The results show that the purity of uranium obtained after extraction, washing and stripping is more than 99%, and the yield of uranium is More than 98%, effectively realizing the enrichment and purification of uranium.

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 Patents(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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