Extraction separation 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, influence on system extraction effect, difficulty in back-extraction at equilibrium time, etc.

Active Publication Date: 2013-09-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • 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 separation method of rare-earth element
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  • Extraction separation method of rare-earth element

Examples

Experimental program
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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

A method for extracting and separating a rare-earth element. Cations and anions in a quaternary ammonium ionic liquid extractant, that is, 2-ethylhexyl phosphate mono-2-ethylhexyl acrylate trialkyl-ammonium and phosphate di(2-ethylhexyl) phthalate trialkyl-ammonium, are reacted with rare-earth ions to form neutral complex molecules, also, a collaborative effect and a competitive effect are present between the cations and the anions in the quaternary ammonium ionic liquid extractant in a rare-earth element extraction process, the separation factor for the rare-earth element is thus increased. The method for extracting and separating the rare-earth element provides great interfacial phenomena in the extraction process, generates no emulsification, obviates the need for extractant saponification, and provides increased separation factor for rare-earth elements, and particularly increased separation factor for heavy rare-earth elements. In addition, the rare-earth element extraction and separation method is of reduced extraction acidity, of reduced stripping acidity, and of reduced acid consumption.

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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Patent Type & Authority Patents(China)
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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