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Extraction separation method of rare earth element

A separation method and rare earth element technology, which are applied in the field of rare earth element separation, can solve the problems of unsolved problems such as the decrease of the extraction capacity of the composite extractant recycling extractant, affecting the application of green extraction technology, etc., so as to reduce the cost of rare earth separation, improve the extraction capacity and Separation capacity, effect of reducing acid and water consumption

Active Publication Date: 2019-04-02
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these disclosed methods do not solve the problems of composite extractant, recycling of water and acid, and the decline of extraction capacity of the extractant, which will seriously affect the application of this green extraction technology

Method used

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  • Extraction separation method of rare earth element
  • Extraction separation method of rare earth element
  • Extraction separation method of rare earth element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] refer to Figure 1-3 , (1) Send the rare earth raw material solution containing La, Ce, Pr, and Nd (the rare earth concentration is 1.3mol / L, the hydrogen ion concentration is 0.7mol / L) into the first stage from the bottom of the extraction section in the extraction and separation process one, The basic extractant (composed of 15% trioctylamine, 30% 2-octanol and 55% n-hexane) is sent to the first stage of the extraction section, and the organic phase after the 4th stage extraction flows into the first stage of the stripping section, The water is sent to the penultimate first stage of the stripping section, and the organic phase is returned to the first stage of the extraction section after 6-stage stripping for reuse; the water phase discharged from the first stage of the extraction section is sent to the second extraction and separation process;

[0042] (2) Send the acidic-alkaline compound extractant (composed of 20% 2-ethylhexylphosphonic acid mono-2-ethylhexyl est...

Embodiment 2

[0050] refer to Figure 1-3 , (1) Send the rare earth raw material solution containing La and Ce (the concentration of rare earth is 1.1mol / L, the concentration of hydrogen ion is 1.0mol / L) into the reciprocal first stage of the extraction section in the extraction and separation process 1, and the alkaline extraction The agent (composed of 30% primary amine, 30% tributyl phosphate and 40% sulfonated kerosene) is sent to the first stage of the extraction section, and the organic phase after five-stage extraction flows into the first stage of the stripping section, and the water It is sent to the penultimate first stage of the stripping section, and the organic phase is returned to the first stage of the extraction section for reuse after 7-stage stripping; the aqueous phase discharged from the first stage of the extraction section is sent to the second extraction and separation process;

[0051] (2) Send the acidic-alkaline compound extractant (composed of 45% 2-ethylhexylphos...

Embodiment 3

[0059] refer to Figure 2-3 , (1) Acidic-alkaline composite extractant (composed of 15% bis(2,4,4-trimethylpentyl)phosphonic acid, 30% trioctylamine, 30% n-heptanol and 25% sulfonated kerosene ) into the first stage of the extraction section in the second extraction and separation process, which will contain 15 kinds of rare earths such as La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, etc. The elemental hydrochloric acid solution (the rare earth concentration is 1.6mol / L, the hydrogen ion concentration is 0.001mol / L) is sent to the reciprocal first stage of the extraction section in the second extraction and separation process;

[0060] In the process of extraction, the water phase of the penultimate 4th stage of the extraction section in the extraction and separation process 2 is drawn out, sent to the penultimate 1st stage of the extraction section 3 in the extraction and separation process, and flows through the extraction section in the extraction and separati...

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Abstract

The invention discloses an extraction separation method of a rare earth element. The method comprises the steps of adopting an acid-alkaline composite extraction agent for separating the rare earth element, during the extraction process, extracting a water phase of an intermediate stage of an extraction section, after extracting and separating through an alkaline extraction agent, returning to theextraction section, and continuously extracting; and introducing a water phase discharged from a washing section into the intermediate stage of the extraction section, extracting, and returning waterwashing liquid discharged by a water washing section to the water washing section, the washing section and the extraction section so as to be used or used for preparing acid for dissolving rare earthore. According to the extraction separation method of the rare earth element provided by the invention, the cyclic utilization of the acid-alkaline composite extraction agent is realized, water and acid are recycled, the extraction capacity of the acid-alkaline composite extraction agent is improved, and the rare earth extraction separation cost is remarkably reduced.

Description

technical field [0001] The invention relates to a rare earth element separation method, in particular to a method for extracting and separating rare earth elements by using an acidic-alkaline composite extractant. Background technique [0002] Rare earth elements have unique electronic structures and optical, electrical, and magnetic properties. The development and utilization of rare earth resources is of great significance for promoting the development of my country's economy. Rare earth ore is the main rare earth resource. During the smelting process of rare earth ore, the separation of rare earth elements from the leachate of rare earth ore is an important step. The commonly used separation method of rare earth elements is solvent extraction. The rare earth industry in my country mostly uses acidic phosphorus-type extractant P507 or P204 as the main extractant to separate rare earth elements. [0003] The traditional rare earth separation method using di(2-ethylhexyl)p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/40
CPCC22B59/00C22B3/402C22B3/409Y02P10/20
Inventor 刘葵王岩张鹏蒋卷涛魏兴婷
Owner GUANGXI NORMAL UNIV
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