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Method for separating rare earth by using two-inlet three-outlet full-load fractionation and extraction

A rare earth and extraction technology, applied in the direction of improving process efficiency, to achieve the effects of eliminating side effects, improving greenness, and improving quality

Inactive Publication Date: 2015-04-29
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a two-in, three-out full-load fractionation extraction and separation method for rare earths in order to eliminate the side effects of hydrogen ion washing and reduce the separation of rare earths. The consumption of acid and alkali, improving the efficiency of two-in and three-out fractionation extraction stages, and reducing the cost of rare earth separation

Method used

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  • Method for separating rare earth by using two-inlet three-outlet full-load fractionation and extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Two-in and three-out full-load fractional distillation extraction ~ Nd / Sm ~ Dy / Ho ~ group separation of monazite rare earth ore and medium yttrium and europium-rich ore

[0027] 1) Rare earth liquid

[0028] The first rare earth feed solution is an aqueous chloride solution of monazite rare earth ore, the rare earth concentration is 1.5 M, the pH value is 4, the molar fraction of light rare earth La to Nd is 0.95, and the molar fraction of medium rare earth Sm to Dy is 0.01. The mole fraction of heavy rare earths Ho~Lu and Y is 0.04.

[0029] The second rare earth feed solution is a rare earth chloride aqueous solution of medium yttrium and europium-rich ore, the rare earth concentration is 1.0 M, the pH value is 4, the molar fraction of light rare earth La~Nd is 0.55, and the molar fraction of medium rare earth Sm~Dy is 0.10, the mole fraction of heavy rare earths Ho~Lu and Y is 0.35.

[0030] The molar ratio of feed amount of medium yttrium and europium-rich ore liq...

Embodiment 2

[0047] Two-in and three-out full-load fractional distillation extraction ~ Nd / Sm ~ Dy / Ho ~ group separation of bastnaesite and medium yttrium-europium-enriched ore

[0048] 1) Rare earth liquid

[0049] The first rare earth feed solution is an aqueous solution of bastnaesite chloride, the rare earth concentration is 1.0 M, the pH value is 3, the molar fraction of light rare earths La to Nd is 0.98, and the molar fraction of medium rare earths Sm to Dy is 0.01. The mole fraction of the heavy rare earths Ho˜Lu and Y is 0.01.

[0050] The second rare earth feed solution is an aqueous rare earth chloride solution of medium yttrium and europium-rich ore, its rare earth concentration is 1.5 M, the pH value is 2, the molar fraction of light rare earth La~Nd is 0.50, and the molar fraction of medium rare earth Sm~Dy is 0.10, and the mole fraction of heavy rare earth Ho~Lu and Y is 0.40.

[0051] The molar ratio of feed amount of middle yttrium and europium-rich ore liquid to bastnae...

Embodiment 3

[0068] Two-in and three-out full-load fractional distillation extraction~Nd / Sm~Dy / Ho~group separation of yttrium-rich europium ore and high-yttrium ore

[0069] 1) Rare earth liquid

[0070] The first rare earth feed solution is an aqueous solution of medium yttrium and europium-rich chloride, the concentration of rare earth is 1.0 M, the pH value is 3, the molar fraction of light rare earth La~Nd is 0.55, and the molar fraction of medium rare earth Sm~Dy is 0.10. The mole fraction of heavy rare earths Ho~Lu and Y is 0.35.

[0071] The second rare earth feed solution is a rare earth chloride aqueous solution of high yttrium ore, the rare earth concentration is 1.2 M, the pH value is 1, the molar fraction of light rare earth La~Nd is 0.05, and the molar fraction of medium rare earth Sm~Dy is 0.15. The mole fraction of the heavy rare earths Ho~Lu and Y is 0.80.

[0072] The molar ratio of the feed amount of the second rare earth feed liquid to the first rare earth feed liquid ...

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Abstract

The invention discloses a method for separating rare earth by using two-inlet three-outlet full-load fractionation and extraction. According to the method, P507 serves as a rare earth extraction agent, rare earth chloride serves as a raw material, a third outlet is formed in a scrubbing section of a two-inlet three-outlet fractionation and extraction system, and an acid extraction section which takes N235 as an acid extraction agent and takes TBP as a demulsifying agent is arranged between the scrubbing section and the stripping section. According to the acid extraction action of N235, side effects of hydrogen ions are eliminated, so that the rare earth separation coefficient is not reduced, and the extraction amount of rare earth is not lower than the rare earth saponification amount. Compared with the conventional two-inlet three-outlet fractionation and extraction process, the method disclosed by the invention has the advantages that the acid-base consumption in the rare earth separation process can be greatly reduced, the consumption of alkaline reagents is reduced by 54.6-58.8 percent, and the consumption of hydrochloric acid is reduced by 16.1-23.7 percent; the wastewater discharge amount in the rare earth extraction and separation process is greatly reduced, and the greening degree of rare earth separation is greatly improved; and moreover, the grade number of the extraction tank can be reduced by 9.5-24.6 percent, and the total investment of the rare earth extraction and separation process is reduced.

Description

technical field [0001] The present invention relates to a two-in, three-out fully-loaded fractional distillation extraction and separation method for rare earths, in particular to using phosphonate P507 as a rare earth extractant and tertiary amine N235 as a hydrochloric acid extractant, and one fractional distillation extraction system to treat two kinds of chlorinated mixed rare earth feed liquids, Three kinds of separation products are obtained, and the extraction amount of rare earths in the fractional distillation extraction system is not lower than the saponification amount of rare earths. The invention belongs to the field of solvent extraction in hydrometallurgy. Background technique [0002] Due to the extremely similar chemical properties between rare earth elements, the separation of rare earth elements is quite difficult. However, rare earth elements are known as the treasure house of modern new materials due to their superior physical and chemical properties. ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/38C22B3/40
CPCY02P10/20
Inventor 钟学明
Owner NANCHANG HANGKONG UNIVERSITY
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