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Method for enriching rare earth from rare earth leaching mother liquor

A rare earth and leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of low amount of rare earth adsorbed by resin and low effective utilization rate of extractant, etc., and achieve the effect of convenient operation and simple process

Inactive Publication Date: 2015-05-06
JIANGXI UNIV OF SCI & TECH +1
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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

Method used

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  • Method for enriching rare earth from rare earth leaching mother liquor
  • Method for enriching rare earth from rare earth leaching mother liquor

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preparation example Construction

[0033] (1) Preparation of mixed resin:

[0034] 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;

[0035] (2) Column packing:

[0036] 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;

[0037] (3) Column enrichment:

[0038] 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 and back extraction column H according to the column connection section, and the direction of the column is along t...

Embodiment 1

[0044] 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 completely soak the resin , and then packed into an ion-exchange column with a column diameter of 20mm and a column height of 1000mm by the wet column packing method, and the column packing height was 850mm.

[0045] Enrichment process route such as figure 1 , multi-column series such as figure 2 . The process includes 10 separation columns, including 5 extraction columns and 5 stripping columns. Leach the mother liquor with a rare earth pH value of 4.0 at 1.5cm·min -1 The flow rate from F 1 Flow through the separation column at 0.5cm·min with hydrochloric acid with a concentration of 5.5mol / L -1 The flow rate from H 1 Flow through the separation column at F 1 After column adsorption saturation, F 1 The column moves into the stripping section. in H 4 The rare earth en...

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Abstract

The invention discloses a method for enriching rare earth from rare earth leaching mother liquor. The method comprises the following steps: (1) preparation of mixed resin, (2) column packing, (3) column enrichment, (4) column washing and (5) column cycling. The method has the positive effects that the rare earth leaching mother liquor is enriched by adopting an ion-exchange resin method, thus solving the problem of environmental pollution caused by precipitation; 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 problem of phase separation difficulty caused by traditional solvent extraction is solved by enriching the rare earth leaching mother liquor by an ion exchange method; a new method is provided for enrichment of the rare earth leaching mother liquor.

Description

technical field [0001] The invention relates to the technical field of recovery of rare earth elements, in particular to a method for enriching rare earths from a rare earth leaching mother liquor. Background technique [0002] The rare earths in the ionic rare earth ore exist in the form of "ions" in the granite weathering crust, and the rare earth leaching solution is obtained through ammonium sulfate or magnesium sulfate in-situ leaching technology, but the concentration of rare earths in the obtained leaching solution is low, the chemical composition is complex, and the content of impurity ions is large. . At present, the rare earth process methods used for enrichment and leaching of mother liquor mainly include ammonium bicarbonate precipitation method, oxalic acid precipitation method, magnesium bicarbonate precipitation method and solvent extraction method. Ammonium bicarbonate precipitation method has poor selectivity and is easy to form co-precipitation with other i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B59/00
CPCY02P10/20
Inventor 杨幼明蓝桥发张胜其张剑管新地聂华平叶信宇
Owner JIANGXI UNIV OF SCI & TECH
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