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An ionic liquid [omim]bf 4 Method for extracting light rare earth elements in acidic solution

A light rare earth element and ionic liquid technology, which is applied in the field of rare earth hydrometallurgy, can solve problems such as low recovery rate, secondary pollution, and high energy consumption of the technology, and achieve the effect of simple extraction system, reduced cost, and high extraction efficiency

Active Publication Date: 2018-01-19
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

[0005] Aiming at the problems of volatilization of organic solvents, low recovery rate, large technical energy consumption and easy to cause secondary pollution in the process of rare earth extraction by solvent extraction, the present invention provides a method using ionic liquid [OMIM]BF 4 The method for extracting light rare earth elements in acidic solution, the purpose is to use ionic liquid as extraction agent, transfer rare earth elements from acidic solution to ionic liquid through liquid-liquid extraction, and realize the extraction of rare earth from aqueous solution by centrifugation

Method used

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  • An ionic liquid [omim]bf <sub>4</sub> Method for extracting light rare earth elements in acidic solution
  • An ionic liquid [omim]bf <sub>4</sub> Method for extracting light rare earth elements in acidic solution
  • An ionic liquid [omim]bf <sub>4</sub> Method for extracting light rare earth elements in acidic solution

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Effect test

Embodiment 1

[0029] The present embodiment adopts ionic liquid [OMIM] BF 4 The method for extracting light rare earth elements in acidic solution is carried out according to the following steps:

[0030] (1) to contain La 3+ The rare earth chloride solution is the raw material solution, and the La in the raw material solution 3+ The concentration is 0.02mol / L, and the acidity is 0.2mol / L;

[0031] (2) Mix the raw material solution with the ionic liquid [OMIM]BF 4 Mixed extraction was carried out in an oscillator, the mixing ratio O / A was 2:1, the rotation speed during the extraction process was 200 r / min, the extraction time was 10 minutes, and the extraction temperature was 25°C. After the extraction was completed, the mixed solution was centrifuged to obtain the loaded rare earth The organic phase and raffinate of centrifugation were 1000 r / min, and the centrifugation time was 5min, and the La in the raffinate was determined 3+ Concentration, after calculation, the extraction rate is...

Embodiment 2

[0034] The present embodiment adopts ionic liquid [OMIM] BF 4 The method for extracting light rare earth elements in acidic solution is carried out according to the following steps:

[0035] (1) to contain Ce 3+ The nitric acid solution is the raw material solution, and the Ce in the raw material solution 3+ The concentration is 0.1mol / L, and the acidity is 0.5mol / L;

[0036] (2) Mix the raw material solution with the ionic liquid [OMIM]BF 4 Mixed extraction was carried out in an oscillator, the mixing ratio O / A was 1:1, the rotation speed during the extraction process was 300 r / min, the extraction time was 20 minutes, and the extraction temperature was 35°C. After the extraction was completed, the mixed solution was centrifuged to obtain the loaded rare earth The organic phase and raffinate of centrifugation were separated by a centrifugal speed of 1500 r / min, and the centrifugation time was 8min. Ce in the raffinate was measured 3+ Concentration, after calculation, the e...

Embodiment 3

[0039] The present embodiment adopts ionic liquid [OMIM] BF 4 The method for extracting light rare earth elements in acidic solution is carried out according to the following steps:

[0040] (1) to contain Pr 3+ The sulfuric acid solution is the raw material solution, and the Pr in the raw material solution 3+ The concentration is 0.05mol / L, and the acidity is 1mol / L;

[0041] (2) Mix the raw material solution with the ionic liquid [OMIM]BF 4 Mixed extraction was carried out in an oscillator, the mixing ratio O / A was 1:5, the rotation speed during the extraction process was 400 r / min, the extraction time was 40 minutes, and the extraction temperature was 45°C. After the extraction was completed, the mixed solution was centrifuged to obtain the loaded rare earth The organic phase and raffinate, the centrifugation speed of centrifugation is 2000 r / min, the centrifugation time is 10min, and the determination of Pr in the raffinate 3+ Concentration, after calculation, the extrac...

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Abstract

The invention belongs to the field of rare earth hydrometallurgy and the technical field of ionic liquid extraction, in particular to a method using ionic liquid [OMIM]BF 4 A method for extracting light rare earth elements in acidic solution. In the present invention, the aqueous solution containing light rare earth elements is used as the raw material liquid, and the raw material liquid and the ionic liquid are mixed for extraction, and the mixed solution after the extraction is centrifuged to obtain the rare earth-loaded organic phase and raffinate, and the stripping agent is used to extract the rare earth-loaded The organic phase is back-extracted, and the mixed solution after the back-extraction is centrifuged to recover the rare earth, and the separated ionic liquid is recycled. The extraction system of the invention is simple, has high extraction efficiency, no emulsification phenomenon, rapid phase separation, is immiscible with water, and reduces organic phase loss.

Description

technical field [0001] The invention belongs to the field of rare earth hydrometallurgy and the technical field of ionic liquid extraction, in particular to a method using ionic liquid [OMIM]BF 4 A method for extracting light rare earth elements in acidic solution. Background technique [0002] Rare earth elements are the general term for 17 elements such as lanthanide elements with atomic numbers 57-71 and yttrium and scandium in the periodic table of elements. Rare earth is an important strategic resource, because of its unique physical and chemical properties, it is widely used in metallurgy, petrochemical, electronics, machinery, energy, light industry, environmental protection, agriculture and other fields. Among rare earth elements, light rare earth elements (LREE) including lanthanum (La), cerium (Ce), praseodymium (Pr) and neodymium (Nd) have high content, wide application range and large dosage, and are important components of rare earth elements . [0003] At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/36C22B59/00
CPCC22B59/00C22B3/37Y02P10/20
Inventor 李勇何金桂薛向欣杨合程研博
Owner NORTHEASTERN UNIV LIAONING
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