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Rare earth extraction and separation method

A separation method and extraction technology, applied in the field of extraction and separation of rare earths, can solve problems such as limited extraction capacity of rare earth elements, and achieve the effects of significant synergistic extraction effect, high extraction efficiency, and obvious synergistic effect.

Active Publication Date: 2014-10-08
XIAMEN INST OF RARE EARTH MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, one of the above-mentioned ionic liquids is generally used as an extractant, which has a limited ability to extract rare earth elements.

Method used

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  • Rare earth extraction and separation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0042] Bifunctionalized ionic liquid tetraethylammonium di(2-ethylhexylphosphoric acid) [N 2222 ][P204] and tetraethylammonium 2-ethylhexylphosphonic acid 2-ethylhexyl ester [N 2222 ][P507] is the extractant, which is mixed with sulfonated kerosene and isooctyl alcohol to form an organic phase. The volume ratio of the mixed extractant, isooctyl alcohol and sulfonated kerosene in the organic phase is 0.10:0.10:0.80.

[0043] The concentration of rare earth ions is respectively prepared to be 0.01 mol / liter, the rare earth solution of pH=4.0, and the rare earth ions are respectively La 3+ 、Nd 3+ 、Eu 3+ 、Dy 3+ and Er 3+ .

[0044] The organic phase with a volume ratio of 1:1 is mixed with the rare earth solution, and extracted at room temperature, and the extraction stage is 1 stage.

[0045] After extraction, calculate its distribution ratio and co-extraction coefficient, the results show that tetraethylammonium bis (2-ethylhexyl phosphoric acid) [N 2222 ][P204] and tetra...

Embodiment 6～10

[0052] Tetra-n-butylammonium bis(2-ethylhexylphosphoric acid) [N 4444 ][P204] and tetra-n-butylammonium 2-ethylhexylphosphonic acid 2-ethylhexyl ester [N 4444 ][P507] is the extractant, which is mixed with sulfonated kerosene to form an organic phase. The volume ratio of the mixed extractant to sulfonated kerosene in the organic phase is 0.20:0.80.

[0053] The concentration of rare earth ions is 0.1 mol / liter, the rare earth solution of pH=3.0 is prepared respectively, and the rare earth ions are respectively La 3+ 、Nd 3+ 、Eu 3+ 、Dy 3+ and Er 3+ .

[0054] The organic phase with a volume ratio of 1:1 is mixed with the rare earth solution, and extracted at room temperature, and the extraction stage is 1 stage.

[0055] After the extraction, calculate its distribution ratio and co-extraction coefficient, the results show that tetra-n-butylammonium bis (2-ethylhexyl phosphoric acid) [N 4444 ][P204] and tetra-n-butylammonium 2-ethylhexylphosphonic acid 2-ethylhexyl ester [...

Embodiment 11～15

[0057] Bifunctional ionic liquid tetraethylammonium di(2-ethylhexylphosphoric acid) [N 2222 ][P204] and tetrabutylammonium 2-ethylhexylphosphonic acid 2-ethylhexyl ester [N 4444 ][P507] is the extractant, which is mixed with sulfonated kerosene and isooctyl alcohol to form an organic phase. The volume ratio of the mixed extractant, isooctyl alcohol and sulfonated kerosene in the organic phase is 0.10:0.10:0.80.

[0058] The concentration of rare earth ions is respectively prepared to be 0.01 mol / liter, the rare earth solution of pH=4.0, and the rare earth ions are respectively La 3+ 、Nd 3+ 、Eu3+ 、Dy 3+ and Er 3+ .

[0059] The organic phase with a volume ratio of 1:1 is mixed with the rare earth solution, and extracted at room temperature, and the extraction stage is 1 stage.

[0060] After extraction, calculate its distribution ratio and co-extraction coefficient, the results show that tetraethylammonium bis (2-ethylhexyl phosphoric acid) [N 2222 ][P204] and tetrabutyla...

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Abstract

The invention provides a rare earth extraction and separation method which comprises the following step of extracting a rare earth-containing solution through an organic phase containing an extraction agent and a diluent, wherein two extraction agents are selected from ionic liquid, positive ions in the ionic liquid are selected from quaternary ammonium positive ions or quaternary phosphonium positive ions, and negative ions in the ionic liquid are selected from negative ions obtained by performing deprotonation on an acidic phosphine extraction agent. When rare earth elements are extracted by taking two kinds of compounded different bifunctional ionic liquid as the extraction agents, the method has an obvious synergistic extraction effect and is high in rare earth extraction efficiency and good in separation effect. The experimental result proves that the synergistic extraction coefficients of La<3+>, Nd<3+>, Eu<3+>, Dy<3+> and Er<3+> can be 6, 100, 400, 300 and 450, the synergistic extraction coefficients of Ce<3+>, Pr<3+>, Sm<3+>, Ho<3+> and Lu<3+> are respectively 3, 9, 15, 25 and 30, and the method has an obvious synergistic effect.

Description

technical field [0001] The invention relates to the field of rare earth separation, in particular to a rare earth extraction and separation method. Background technique [0002] As an important strategic resource, rare earths are attracting more and more attention at home and abroad. Bis(2-ethylhexyl phosphoric acid) (P204) and 2-ethylhexyl 2-ethylhexylphosphonate (P507) are widely used in the rare earth industry and nuclear industry in the world, and are two important industrial rare earth separation and extraction agent. In my country's traditional rare earth separation process, acidic extractants such as P204 and P507 must first undergo a saponification step to remove hydrogen ions, break the dimer caused by hydrogen bonds between acidic extractants, and improve the extraction capacity of the extractant, such as China The methods disclosed in patent document CN103641150A and Chinese patent document CN103602812A, etc. But saponification will bring a large amount of waste...

Claims

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Application Information

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IPC IPC(8): C22B3/38C22B3/40C22B59/00
CPCY02P10/20
Inventor 孙晓琦王艳良郭向广
Owner XIAMEN INST OF RARE EARTH MATERIALS
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