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Extraction seperation method of rare-earth element

A separation method and rare earth element technology, applied in the field of extraction, can solve problems such as changes in extractant components, affecting the extraction effect of the system, and difficult reaction control.

Active Publication Date: 2012-08-01
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

This system overcomes the shortcomings of P507, such as long extraction equilibrium time and difficult stripping, but the composition of the extractant changes continuously with the reaction, and the reaction is difficult to control. The acidity of the feed liquid during the extraction of this system is 0.1mol / L
[0004] In addition, the Chinese patent document CN100352954C reports a process for extracting and separating heavy rare earth elements by adding a modifier. This process uses a P507 alcohol system to separate a single rare earth. Due to the differences in the solubility of the components in the mixed system, long-term operation will lead to Changes in the composition of the extractant affect the extraction effect of the system

Method used

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  • Extraction seperation method of rare-earth element
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 112.36 grams of quaternary ammonium chloride 336 and dissolve it in 500 mL of distilled isopropanol to make it completely dissolved; add 6.39 grams of metal sodium to a plastic bottle, add 125 mL of distilled isopropanol, and react at room temperature Prepare sodium alkoxide in 3 hours; mix the above solutions and stir at 50°C for 4 hours to prepare [A336][OR]; centrifuge the resulting solution at 8000 rpm for 10 minutes to remove the sodium chloride precipitate; add to the filtrate 500 ml of deionized water, shaken for 30 minutes, and hydrolyzed to prepare [A336][OH];

[0045] Take 172mL of [A336][OH] solution with a concentration of 0.121mol / L, add 6.2455g of P507 (the molar ratio of [A336][OH] to 507 is 1.1:1), and stir the solution under reflux at 50°C for 12 Hours, after standing the resulting solution for phase separation, the lower phase was discarded, and the upper phase was rotated at 80° C. and 20 mbar to spin out the contained isopropanol and water to o...

Embodiment 2

[0047] Weigh 112.36 grams of quaternary ammonium chloride 336 and dissolve it in 500 mL of distilled isopropanol to make it completely dissolved; add 6.39 grams of metal sodium to a plastic bottle, then add 125 mL of distilled isopropanol, and React for 3 hours to prepare sodium alkoxide; mix the above solutions and stir at 50°C for 4 hours to prepare [A336][OR]; centrifuge the resulting solution at 8000 rpm for 10 minutes to remove the sodium chloride precipitate; add to the filtrate 500 ml of deionized water, shaken for 30 minutes, and hydrolyzed to prepare [A336][OH];

[0048] Take 192 mL of [A336][OH] solution with a concentration of 0.111mol / L, add 8.0057g of P204 (the molar ratio of [A336][OH] to P204 is 1.1:1), and stir the solution under reflux at 50°C for 12 Hours, after standing the resulting solution for phase separation, the lower phase was discarded, and the upper phase was 80° C. and 20 mbar to spin out the contained isopropanol and water to obtain [A336][P204]. ...

Embodiment 3

[0049] Example 3[A336][P507] Extraction and separation of a single rare earth ion

[0050] Mix 1.0mL of 0.05mol / L [A336][P507]n-heptane solution with 5.0mL containing NaNO 3 Mix with an aqueous solution of Ho(III), where NaNO in the aqueous solution 3 Concentration is 1.0mol / L, Ho(III) concentration is 7.5×10 -4 mol / L, after shaking at a constant temperature of 25°C for 1 h, measure the concentration of Ho(III) in the water phase, and then calculate the extraction rate and distribution ratio of Ho(III).

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Abstract

The invention discloses an extraction seperation method of a rare-earth element. According to extraction seperation method, positive ions and negative ions in a quaternary ammonium salt ionic liquid extracting agent, i.e. 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester trialkyl methyl ammonium and phosphonic acid binary (2-ethylhexyl) ester trialkyl methyl ammonium react with rare earth ions to form neutral complex molecules, and the positive ions and negative ions in the quaternary ammonium salt ionic liquid extracting agent have inner synergistic effect and competitive effect in the process of extracting the rare-earth element, thereby the seperation factor of the rare-earth element is increased. Therefore, the extraction seperation method provided by the invention has the advantages that an interfacial phenomenon is good in the extraction process, no emulsification is generated, and an extracting solvent does not need to be saponified, the extraction seperation method has higher seperation factor of the rare-earth element and particularly high extraction seperation effect on heavy rare earth. In addition, the extraction seperation method of the rare-earth element, which is provided by the invention, has low extraction acidity and back extraction acidity and consumes little acid.

Description

technical field [0001] The invention relates to the technical field of extraction, in particular to an extraction and separation method of rare earth elements. Background technique [0002] Rare earth elements include lanthanide elements with atomic number 57-71 and yttrium with atomic number 39. Due to their unique physical and chemical properties, one or more of rare earth elements are often used as additives in metallurgy, glass, and chemical industry. , nuclear industry, electronics industry, agriculture and medicine, and various functional materials. Solvent extraction separation method is the main method for separating and purifying rare earth elements in domestic and foreign rare earth industrial production, and is also the main method for separating and preparing high-purity rare earth compounds. It has the advantages of large processing capacity, fast reaction speed and good separation effect. In recent years, the efficient and clean separation of rare earths has b...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/38
CPCC22B3/0079C22B3/0005C22B59/00Y02P10/20C22B3/408C22B3/26C22B3/04C22B3/14
Inventor 陈继郭琳邓岳锋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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