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Method and device for extracting and separating praseodymium and neodymium

An extraction and organic extraction agent technology, applied in the field of solvent extraction and separation of rare earth elements, can solve the problem of low single-stage extraction rate of praseodymium and neodymium

Inactive Publication Date: 2013-05-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still needs about 80 stages of cascaded extractions before the praseodymium and neodymium can be separated and purified better.
In addition, the single-stage extraction rate of praseodymium and neodymium is not high

Method used

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  • Method and device for extracting and separating praseodymium and neodymium

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Experimental program
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Effect test

Embodiment 1

[0044] Dissolve the oxides of praseodymium and neodymium with 100mL of hydrochloric acid aqueous solution with a concentration of 0.1mol / L, and prepare a mixed solution containing praseodymium and neodymium ions (the initial concentration of praseodymium ions is 50mg / L, and the initial concentration of neodymium ions is 80mg / L) . At room temperature, add DTPA, the ratio of the added molar amount to the molar amount of praseodymium ions in the initial aqueous solution is 1:1, and adjust the pH value of the mixed solution to 5. Then air bubbles are blown into the mixed solution, and 80% by volume of di(2,4,4-trimethylpentyl)phosphinic acid in kerosene is slowly added at a rate of 0.5mL / min Solution 5ml. After all the 5ml of organic solvent was added, the organic phase at the top of the container was collected, and the neodymium in it was recovered by stripping. Ammonium oxalate was added to the stripping solution to precipitate, and the precipitate was washed, filtered, and bur...

Embodiment 2

[0046] Dissolve the oxides of praseodymium and neodymium with 100mL of hydrochloric acid aqueous solution with a concentration of 0.1mol / L, and prepare a mixed solution containing praseodymium and neodymium ions (the initial concentration of praseodymium ions is 50mg / L, and the initial concentration of neodymium ions is 20mg / L) . At room temperature, DOTA was added, and the ratio of the molar amount added to the molar amount of neodymium ions in the initial aqueous solution was 5:1, and the pH value of the mixed solution was adjusted to 4. Then add 20 grams of ammonium sulfate to this mixed solution, blow in air bubbles, and slowly add the weight of modified 2-ethylhexyl phosphate mono-2-ethylhexyl ester organic functional group at a speed of 5mL / min under the state of blowing air. 50ml of PEG aqueous solution (pH=4) with an average molecular weight of 2000, of which PEG2000 content is 10g. After all the 50ml PEG2000 aqueous solution has been added, collect the polymer phase ...

Embodiment 3

[0048] Dissolve the oxides of praseodymium and neodymium with 300mL of hydrochloric acid aqueous solution with a concentration of 0.1mol / L, and prepare a mixed solution containing praseodymium and neodymium ions (the initial concentration of praseodymium ions is 100mg / L, and the initial concentration of neodymium ions is 85mg / L) . At room temperature, DOTA was added, and the ratio of the added molar amount to the molar amount of neodymium ions in the initial aqueous solution was 2:1, and the pH value of the mixed solution was adjusted to 4. Then add 60 grams of sodium sulfate in this mixed solution, blow into air bubbles, under the state of blowing air, slowly add the weight-average molecular weight that has modified two (2-ethylhexyl) phosphate organic functional groups at a speed of 1mL / min. 2500 EOPO20ml. When all 20ml of EOPO was added, the polymer phase at the top of the container was collected, and the praseodymium contained therein was recovered by stripping. Ammonium ...

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Abstract

The invention relates to a method and device for dynamically extracting and separating praseodymium and neodymium in a nonequilibrium state. The method comprises the following steps of: adding a water-soluble complexing agent to a water solution containing praseodymium and neodymium ions at room temperature; regulating the pH value of the solution; slowly adding an organic extractant in an aeration state, or adding inorganic electrolyte salt and then adding a water-soluble high-molecular polymer with an organic extractant functional group modified; and then collecting organic phases or polymer phases which are positioned on the top of a container, and carrying out reverse extraction and recovery on the praseodymium or the neodymium which is contained in the organic phases or the polymer phases. The method and device disclosed by the invention can be used for realizing the dynamic separation of the praseodymium and the neodymium and have the advantages of fast praseodymium and neodymium separation, high separation coefficient and high single-stage extraction stage efficiency.

Description

technical field [0001] The invention relates to the technical field of solvent extraction and separation of rare earth elements, in particular to a method and device for extracting and separating praseodymium and neodymium in a dynamic non-equilibrium state. Background technique [0002] Praseodymium and neodymium are the most difficult pair of adjacent rare earth elements in the light rare earth group. Due to the extremely similar chemical properties of the two, it is very difficult to obtain a single high-purity NdPr product in the actual production process. In order to obtain high-purity praseodymium and neodymium, most of the existing published reports use the ion exchange method. However, the ion exchange method has a small amount of feed liquid, low production capacity, slow speed and high cost. [0003] Compared with the ion exchange method, the solvent extraction method has many obvious advantages. For example, the process is simple, the processing capacity is lar...

Claims

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Application Information

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IPC IPC(8): C22B3/02C22B3/26C22B3/40C22B59/00
CPCY02P10/234Y02P10/20
Inventor 黄焜刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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