Technology for separating rare earth element by extraction system added with modifier

A technology of heavy rare earth elements and modifiers, applied in the direction of improving process efficiency, can solve the problems of high acidity and incompleteness of heavy rare earth ion stripping, and achieve the effect of high selectivity and easy stripping

Inactive Publication Date: 2007-12-05
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

For P507, the main disadvantages are: (1) the heavy rare earth ion stripping has high acidity and is incomplete; (2) the separation coefficient β value of Nd / Pr, Gd / Eu, Er / Y, Lu / Yb, etc. is small , between 1.4-1.7

Method used

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  • Technology for separating rare earth element by extraction system added with modifier
  • Technology for separating rare earth element by extraction system added with modifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The experimental temperature is 10-35°C. Compared with the condition of 1:1, the acidity of the water phase is fixed, and the chlorinated or nitrated rare earth is used as the feed liquid, and the pH of the feed liquid is <6.0; P507 is used as the extraction agent, and the ratio of ROH is changed according to the physical phenomenon. Good, high extraction efficiency, high selectivity requirements, determine the addition ratio of ROH, that is, the ratio of adding alcohol is 1%-50% (volume percentage), and the optimal ratio is 10%-30%.

Embodiment 2

[0013] The experimental temperature is 10-35°C, and under the condition of 1:1, the extraction agent is saturated with chlorinated or nitrated rare earth feed solution several times to determine the saturation capacity of the P507+ROH extraction system;

[0014] Additives

[0015] 30％

Embodiment 3

[0017] The extraction temperature is 25+-1°C, the acidity of the water phase is fixed, and the rare earth chloride YbCl is selected 3 , compared to the condition of 1:1, with P507 as the extractant, C P507 = 1.5M, add different proportions of methylheptanol as the extraction system, after the extraction is saturated, use 1-6 HCl to compare the 2:1 back-extraction extract, and determine the acidity of the back-extraction;

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Abstract

The invention relates to a technology for separating rare earth element by extraction system added with modifier, which comprises using potassium dihydrogen phosphate and its sulfo-derivative as the extractant, wherein the potassium dihydrogen phosphate or its sulfo-derivative is bis-(2-ethylhexyl)phosphate (P204), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507), bis(2, 4, 4-trimethylpentyl)phosphinic acid (Cyanex272), bis(2, 4, 4-trimethylpentyl) dithiophosphinic acid (cyanex301), bis(2, 4, 4-trimethylpentyl) monothiophosphinic acid (Cyanex302), using ROH as addition agent, R is C4-C10 alkyl, using alkane or aromatic hydrocarbon as thinning agent, forming 1.0-1.5M potassium dihydrogen phosphate - 5-30% ROH - alkane or aromatic hydrocarbon extraction architecture, using chlorinated or nitrated rare earth solution as feed liquid, using hydrochloric acid or nitric acid as inverse acid, determining single rare earth in raffinate or strip liquor through EDTA titration, and determining mixed rare earth through plasma atom emission spectrometric method.

Description

technical field [0001] The invention belongs to a process for separating rare earth elements with an extraction system adding a modifier, in particular to a process for separating and purifying rare earth elements with a phosphorus (phosphine) extraction system adding a modifier. Background technique [0002] At present, the hydrometallurgical separation process of single rare earth mainly uses liquid-liquid extraction technology, and the extraction systems used are different. As the main separation technology of rare earth - P507 separation and purification of rare earth elements has been widely used in industrial production. After a long period of practice, it has been proved that the P507 extraction process is better than the P204 (HDEHP) process first applied to rare earths in the 1960s, but there are still certain problems. For P507, the main disadvantages are: (1) heavy rare earth ion stripping has high acidity and is incomplete; (2) the separation coefficient β value...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B59/00
CPCY02P10/20
Inventor 李德谦王香兰孟淑兰李薇
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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