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Two-in and three-out full-load fractional distillation extraction method for separating samarium europium gadolinium enrichment

A kind of enrichment and extraction technology, which is applied in the Gd sub-field, can solve the problems of reducing the amount of extraction and washing, the consumption of acid-base reagents, and the high cost of separation, so as to improve the degree of greening, reduce the consumption of acid-base, and reduce the total investment Effect

Inactive Publication Date: 2016-08-17
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a new Sm / Eu method for the existing Sm / Eu / Gd separation process of samarium-europium-gadolinium enrichment, which has the disadvantages of relatively large consumption of acid-base reagents, more extraction stages, and higher separation costs. / Gd separation of samarium, europium and gadolinium enrichment process, through the two-in and three-out fractional distillation extraction technology to reduce the amount of extraction and washing, through the acid extraction section to eliminate the side effects of hydrogen ion washing, to reduce the acid-base consumption of rare earth separation, improve samarium europium Gadolinium enrichment fractionation extraction stage efficiency, reduced cost of rare earth separation

Method used

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  • Two-in and three-out full-load fractional distillation extraction method for separating samarium europium gadolinium enrichment

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Experimental program
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Effect test

Embodiment 1

[0029] 1) Rare earth liquid

[0030] The first aqueous solution of samarium europium gadolinium enrichment rare earth chloride has a rare earth concentration of 1.2M and a pH value of 2; in terms of rare earth elements, the molar fraction of samarium Sm is 0.42, the molar fraction of europium Eu is 0.08, and the molar fraction of gadolinium Gd The mole fraction is 0.50.

[0031] The second aqueous solution of samarium, europium and gadolinium enrichment rare earth chloride has a rare earth concentration of 1.2M and a pH value of 1; in terms of rare earth elements, the molar fraction of samarium Sm is 0.42, the molar fraction of europium Eu is 0.08, and the molar fraction of gadolinium Gd The mole fraction is 0.50.

[0032] In terms of the molar ratio of rare earth ions, the feed ratio of the first rare earth feed liquid to the second rare earth feed liquid is 1:1.

[0033] 2) Rare earth extraction organic phase

[0034] The organic phase of the rare earth extraction is kero...

Embodiment 2

[0049] 1) Rare earth liquid

[0050] The first aqueous solution of samarium europium gadolinium enrichment rare earth chloride has a rare earth concentration of 1.5M and a pH value of 4; in terms of rare earth elements, the molar fraction of samarium Sm is 0.42, the molar fraction of europium Eu is 0.08, and the molar fraction of gadolinium Gd The mole fraction is 0.50.

[0051] The second samarium europium gadolinium enrichment rare earth chloride aqueous solution has a rare earth concentration of 1.0M and a pH value of 1; in terms of rare earth elements, the molar fraction of samarium Sm is 0.42, the molar fraction of europium Eu is 0.08, and the molar fraction of gadolinium Gd The mole fraction is 0.50.

[0052] In terms of the molar ratio of rare earth ions, the feed ratio of the first rare earth feed liquid to the second rare earth feed liquid is 2:1.

[0053] 2) Rare earth extraction organic phase

[0054] The organic phase of the rare earth extraction is kerosene sol...

Embodiment 3

[0069] 1) Rare earth liquid

[0070] The first aqueous solution of samarium europium gadolinium enrichment rare earth chloride has a rare earth concentration of 1.2M and a pH value of 3; in terms of rare earth elements, the molar fraction of samarium Sm is 0.42, the molar fraction of europium Eu is 0.08, and the molar fraction of gadolinium Gd The mole fraction is 0.50.

[0071] The second aqueous solution of samarium europium gadolinium enrichment rare earth chloride has a rare earth concentration of 1.0M and a pH value of 2; in terms of rare earth elements, the molar fraction of samarium Sm is 0.37, the molar fraction of europium Eu is 0.08, and the molar fraction of gadolinium Gd The mole fraction is 0.55.

[0072] In terms of the molar ratio of rare earth ions, the feed ratio of the first rare earth feed liquid to the second rare earth feed liquid is 1:1.

[0073] 2) Rare earth extraction organic phase

[0074] The organic phase of the rare earth extraction is sulfonate...

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Abstract

The method of separating samarium, europium and gadolinium concentrates by two-into three-out full-load fractional distillation is using P507 as the rare earth extractant, using samarium, europium and gadolinium concentrates as raw materials, and the third outlet is set in the extraction and washing of the two-into three-out fractional distillation extraction system Between the washing section and the stripping section, there is an acid extraction section with N235 as the acid extraction agent and TBP as the demulsifier; the side effects of hydrogen ions are eliminated through the acid extraction of N235. Compared with the existing Sm / Eu / Gd separation process of samarium europium gadolinium enrichment, it can greatly reduce the acid and alkali consumption of the rare earth separation process, among which the consumption of alkaline reagents is reduced by 52.8% to 54.1%, and the consumption of hydrochloric acid is reduced 12.6% to 15.1%; the wastewater discharge of rare earth extraction and separation process is greatly reduced, and the green degree of rare earth separation is greatly improved; the number of extraction tank stages can be reduced by 112.6% to 15.1%, and the total investment of rare earth extraction and separation process is reduced; The quality of gadolinium products has improved.

Description

technical field [0001] The method for extracting and separating samarium, europium and gadolinium enrichment by two-in and three-out full-load fractional distillation of the present invention relates to a method for separating samarium, europium and gadolinium enrichment by using acidic phosphine P507 as rare earth extractant and N235 as hydrochloric acid extractant, and two-in and three-out fractional distillation extraction system Sm / Eu / Gd separation process for rare earths in a fractionation extraction system whose rare earth extraction amount is not lower than the saponification amount of rare earths; the invention belongs to the technical field of solvent extraction in hydrometallurgy. Background technique [0002] Samarium-europium-gadolinium enrichment is one of the important intermediate products in the separation process of ion-adsorption type rare earth ores. The rare earth content of samarium Sm is about 48%, the content of europium Eu is about 8%, and the content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/28C22B59/00
CPCY02P10/20
Inventor 钟学明
Owner NANCHANG HANGKONG UNIVERSITY