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Method for extracting and separating light rare earth elements by using dual-functional ionic liquid

A technology of light rare earth elements and ionic liquids, which is applied in the field of extraction and separation of light rare earth elements using dual-functional ionic liquids, can solve the problems of stripping difficulties, secondary pollution, etc., and achieve broad application prospects, short equilibration time, and good separation effects Effect

Active Publication Date: 2019-03-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the difficulty of stripping with acidic phosphine extractant in the current rare earth extraction process and easily causing secondary pollution, the purpose of the present invention is to provide a method for extracting and separating light rare earth elements using dual-functional ionic liquids, using ionic liquids that do not volatilize , stable chemical properties and other characteristics, the traditional extraction agent P 507 Combined with ionic liquids, using dual-functional ionic liquids to extract rare earths, the extraction efficiency is high, and there is no ammonia nitrogen wastewater pollution problem

Method used

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  • Method for extracting and separating light rare earth elements by using dual-functional ionic liquid

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Embodiment 1

[0034] In this embodiment, the method for extracting and separating light rare earth elements using a bifunctional ionic liquid is carried out according to the following steps:

[0035] (1) The rare earth chloride solution containing lanthanum is used as the raw material solution, the concentration of lanthanum in the raw material solution is 0.04mol / L, and the pH is 5.5.

[0036] (2) Configure bifunctional ionic liquid as extractant, select n-amyl alcohol as diluent, N-octylpyridinium chloride salt and P 507 The molar ratio is 1:1, P 507 The concentration of 0.1mol / L, the concentration of N-octylpyridinium chloride salt is 0.1mol / L, P 507 The saponification rate is 100%.

[0037] (3) Mix and extract the raw material liquid and the bifunctional ionic liquid in an oscillator, the mixing ratio is O / A=1:1, the rotation speed during the extraction process is 50r / min, the extraction time is 30min, the extraction temperature is 25°C, and the extraction After completion, the mixed...

Embodiment 2

[0040] In this embodiment, the method for extracting and separating light rare earth elements using a bifunctional ionic liquid is carried out according to the following steps:

[0041] (1) A rare earth chloride solution containing cerium is used as a raw material solution, the concentration of cerium in the raw material solution is 0.02mol / L, and the pH is 1.

[0042] (2) Configure bifunctional ionic liquid as extractant, select n-amyl alcohol as diluent, N-octylpyridinium chloride salt and P 507 The molar ratio is 1:3, P 507 The concentration of 0.08mol / L, the concentration of N-octylpyridinium chloride salt is 0.08mol / L, P 507 The saponification rate is 100%.

[0043] (3) Mix and extract the raw material liquid and the bifunctional ionic liquid in an oscillator, the mixing ratio is O / A=1:1, the rotation speed during the extraction process is 75r / min, the extraction time is 25min, the extraction temperature is 35°C, and the extraction After completion, the mixed solution wa...

Embodiment 3

[0046] In this embodiment, the method for extracting and separating light rare earth elements using a bifunctional ionic liquid is carried out according to the following steps:

[0047] (1) The rare earth chloride solution containing praseodymium is used as the raw material solution, the concentration of praseodymium in the raw material solution is 0.01mol / L, and the pH is 2.5.

[0048] (2) Configure bifunctional ionic liquid as extractant, select n-amyl alcohol as diluent, N-octylpyridinium chloride salt and P 507 The molar ratio is 1:1, P 507 The concentration of 0.05mol / L, the concentration of N-octylpyridinium chloride salt is 0.05mol / L, P 507 The saponification rate is 100%.

[0049] (3) Mix and extract the raw material liquid and the bifunctional ionic liquid in an oscillator, the mixing ratio is O / A=1:1, the rotation speed during the extraction process is 100r / min, the extraction time is 20min, the extraction temperature is 15°C, and the extraction After completion, ...

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Abstract

The invention belongs to the technical field of rare earth separation and ionic liquid extraction and particularly relates to a method for extracting and separating light rare earth elements by usingdual-functional ionic liquid. The method comprises the following steps: taking an aqueous solution containing light rare earth elements as a raw material solution, combining 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester with N-octyl pyridine chloride salt, adding sodium hydroxide and adjusting, retaining negative ions of 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and positive ionsof N-octyl pyridine chloride salt, combining the negative ions of 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester with the positive ions of N-octyl pyridine chloride salt to synthesize dual-functional ionic liquid, mixing the dual-functional ionic liquid with acidic raw material liquid, mixing and extracting, centrifuging to obtain an organic phase loaded with rare earth and extraction raffinate, carrying out back extraction of the rare earth by using a back extractant, and centrifuging to obtain a pure rare earth solution and recyclable ionic liquid. The method is high in extraction efficiency, short in equilibration time, simple to operate and free of emulsification phenomena.

Description

technical field [0001] The invention belongs to the technical field of rare earth separation and ionic liquid extraction, and in particular relates to a method for extracting and separating light rare earth elements by using a dual-functional ionic liquid. Background technique [0002] Rare earth is an important non-renewable strategic resource. According to chemical properties and separation process requirements, it can be divided into light rare earth and heavy rare earth. They are widely used in new materials and new technology fields. my country's rare earth reserves rank first in the world. The content of light rare earth elements in adsorption rare earth ore and northern bastnaesite is very high. Light rare earth elements have a wide range of applications and play a pivotal role in rare earth applications. Therefore, the effective separation and purification of light rare earth elements is very important for expanding their application fields. has important meaning. [...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B59/00
CPCC22B59/00C22B3/409Y02P10/20
Inventor 李勇张冬恒姜鹏
Owner NORTHEASTERN UNIV
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