Method for separating rare earth elements

A rare earth element and separation column technology, which is applied in the direction of improving process efficiency, can solve the problems of reduced effective utilization rate of extractant and low amount of rare earth adsorbed by resin, and achieves the effect of convenient operation and simple process

Active Publication Date: 2015-05-06
宁夏同乐新材料科技有限责任公司
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AI Technical Summary

Problems solved by technology

However, when the pure phosphorus extractant ion exchange resin adsorbs rare earth ions, a large amount of H will be exchanged. + , to resolve the rare earth ions with low extraction equilibrium acidity, resulting in a low amount of rare earth adsorbed by the resin and a decrease in the effective utilization rate of the extractant in the resin

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  • Method for separating rare earth elements
  • Method for separating rare earth elements

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Experimental program
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preparation example Construction

[0034] (1) Preparation of mixed resin:

[0035] A mixed resin prepared by mechanically mixing a single phosphorus extractant resin and a single amine extractant resin at a mass ratio of 1:0.1~5; or a composition of a phosphorus extractant and an amine extractant at a mass ratio of 1:0.1~5 The mixed resin prepared by the mixed extractant;

[0036] (2) Column packing:

[0037] The activated carbon adsorption material obtained in step (1) is loaded into an ion exchange column with a column diameter of 1 to 300 cm and a height-to-diameter ratio of 1 to 80:1 by a wet column packing method;

[0038] (3) Column separation:

[0039] The ion-exchange column that step (2) packs obtains carries out multi-column series connection to obtain separation column, and the series connection method is as follows figure 2 , the separation column is divided into extraction column F, washing column W, and stripping column H according to the column connection section, and the direction of the colu...

Embodiment 1

[0046] Weigh dry 2-ethylhexyl phosphate mono-2-ethylhexyl ester (P507) resin and trialkyl tertiary amine (N235) resin in a mass ratio of 1:1 and mix evenly to form a mixed resin, add distilled water to fully soak the resin , and then packed into an ion-exchange column with a column diameter of 20 mm and a column height of 1000 mm by the wet column packing method, and the column packing height was 850 mm.

[0047] The separation process includes 15 separation columns, including 6 extraction columns, 6 washing columns and 3 stripping columns. The concentration of the rare earth material solution used in the experiment is 0.3mol / L, and the rare earth element is divided into Pr 3+ : 51.30%, Nd 3+ : 48.60%, other elements are -1 The flow rate from F 1 Flow through the separation column at 2.5cm·min with hydrochloric acid with a concentration of 5.0mol / L -1 The flow rate from H 1 Flow through the separation column, from H 3 The part of stripping acid flowing out at 1.40cm·min ...

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Abstract

The invention discloses a method for separating rare earth elements. The method comprises the following steps: (1) preparation of mixed resin, (2) column packing, (3) column separation, (4) column washing and (5) column cycling. The method has the advantages that the rare earth elements are separated by adopting an ion-exchange resin method, thus solving the problem of environmental pollution caused by saponification; the problem of low rare earth adsorption quantity caused by low extraction equilibrium acidity of rare earth ions is solved by applying the H<+1> adsorption capacity of N235 resin; the exchange acidity of an adsorption zone can be controlled by utilizing the acid absorption capacity of N235, so that resin has better light rare earth separating capacity; separation of the rare earth elements by adopting a fractional extraction-elution process is achieved by utilizing a mode of connecting a plurality of columns in series and a new method is provided for separation of the rare earth elements.

Description

technical field [0001] The invention relates to the technical field of separation of rare earth elements, in particular to a method for separating rare earth elements. Background technique [0002] Due to the similar electron layer structure and rare earth "lanthanide contraction" phenomenon of rare earth elements, the ionic radii of rare earth elements are similar, which determines the similarity of physical and chemical properties of rare earth elements, making the separation of rare earth elements difficult. There are many separation methods for rare earth elements, and the separation principle is to separate the rare earth elements by repeating the separation steps many times with the help of a certain extractant or precipitant, relying on the slight difference between the rare earth compounds. At present, the solvent extraction method is often used to separate rare earth elements, but the solvent extraction method uses ammonia soap or sodium soap, calcium soap, magnesiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B3/40C22B3/42C22B59/00
CPCY02P10/20
Inventor 杨幼明蓝桥发张胜其张剑管新地聂华平叶信宇
Owner 宁夏同乐新材料科技有限责任公司
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