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An extraction and separation process for the co-production of pure europium and pure erbium by fractional distillation and extraction

An extraction and process technology, applied in the field of extraction and separation process, to achieve the effect of reducing acid and alkali consumption

Inactive Publication Date: 2019-10-29
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the extraction and separation process of fractional extraction and co-production of pure europium and pure erbium in the present invention is: reduce the extraction and separation process of preparing pure europium with rich europium chloride as raw material and prepare pure erbium with rich erbium chloride as raw material The acid-base consumption of the extraction and separation process, and the improvement of the qualified rate of pure europium and pure erbium products

Method used

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  • An extraction and separation process for the co-production of pure europium and pure erbium by fractional distillation and extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The volume percentage of C272 in the kerosene solution in which the organic phase of the saponified C272 is the extraction agent C272 is 30%, and the saponification rate is 36%.

[0034] The pH of the europium chloride-rich solution is 3, and the rare earth element concentrations are: Pr 0.030g / L, Nd 0.30g / L, Sm40.0g / L, Eu 80.0g / L, Gd 30.0g / L, Tb 1.0g / L L, Dy 0.30g / L.

[0035] The pH of erbium-rich chloride is 3, and the rare earth element concentrations are: Gd 0.0030g / L, Tb 0.050g / L, Dy 0.30g / L, Ho 35.0g / L, Y 0.030g / L, Er 90.0g / L , Tm 25.0g / L, Yb 0.20g / L, Lu 0.10g / L.

[0036] Step 1, fractional distillation and extraction to separate PrNdSmEu / EuGdTbDy:

[0037] The saponified C272 organic phase was used as the extraction organic phase, the europium-rich chloride solution was used as the first feed solution, and 3.0 mol / L HCl was used as the washing acid. The organic phase of saponified C272 enters the PrNdSmEu / EuGdTbDy fractionation extraction system from the first...

Embodiment 2

[0052] The volume percentage of C272 in the kerosene solution in which the organic phase of the saponified C272 is the extraction agent C272 is 30%, and the saponification rate is 36%.

[0053] The pH of the europium chloride-rich solution is 2, and the rare earth element concentrations are: Pr 0.050g / L, Nd 0.50g / L, Sm60.0g / L, Eu 60.0g / L, Gd 50.0g / L, Tb 2.0g / L L, Dy 0.50g / L.

[0054] The pH of erbium chloride rich is 4, and the rare earth element concentrations are: Gd 0.0050g / L, Tb 0.10g / L, Dy 0.50g / L, Ho 50.0g / L, Y 0.050g / L, Er 70.0g / L , Tm 35.0g / L, Yb 0.50g / L, Lu 0.30g / L.

[0055] Step 1, fractional distillation and extraction to separate PrNdSmEu / EuGdTbDy:

[0056] The saponified C272 organic phase was used as the extraction organic phase, the europium-rich chloride solution was used as the first feed solution, and 3.0 mol / L HCl was used as the washing acid. The organic phase of saponified C272 enters the PrNdSmEu / EuGdTbDy fractionation extraction system from the first ...

Embodiment 3

[0071] The volume percentage of C272 in the kerosene solution in which the organic phase of the saponified C272 is the extraction agent C272 is 30%, and the saponification rate is 36%.

[0072] The pH of the europium chloride-rich solution is 4, and the rare earth element concentrations are: Pr 0.010g / L, Nd 0.10g / L, Sm20.0g / L, Eu 100.0g / L, Gd 10.0g / L, Tb 0.50g / L L, Dy 0.10g / L.

[0073] The pH of erbium-rich chloride is 2, and the rare earth element concentrations are: Gd 0.0010g / L, Tb 0.030g / L, Dy 0.10g / L, Ho 20.0g / L, Y 0.010g / L, Er 110.0g / L , Tm 15.0g / L, Yb 0.10g / L, Lu 0.050g / L.

[0074] Step 1, fractional distillation and extraction to separate PrNdSmEu / EuGdTbDy:

[0075] The saponified C272 organic phase was used as the extraction organic phase, the europium-rich chloride solution was used as the first feed solution, and 3.0 mol / L HCl was used as the washing acid. The organic phase of saponified C272 enters the PrNdSmEu / EuGdTbDy fractionation extraction system from the f...

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Abstract

The invention discloses an extraction and separation process for fractional extraction and co-production of pure europium and pure erbium. The extraction and separation process uses C272 as the extraction agent, the europium-rich chloride solution is the first feed solution, and the erbium-chloride rich solution is the second. Feed liquid: separation of PrNdSmEu / EuGdTbDy by fractional distillation, separation of GdTbDyHoYEr / ErTmYbLu by fractional distillation, separation of PrNdSm / Eu by full-load fractionation extraction, separation of Eu / GdTbDy by full-load fractionation extraction, separation of GdTbDyHoY / Er by full-load fractionation extraction and separation of Er / TmYbLu by fractionation extraction Step composition. Two high-purity products of 4N-grade europium chloride and 4N-grade erbium chloride are simultaneously obtained through an extraction and separation process of the invention. The invention can reduce the acid-base consumption for preparing 4N-grade europium chloride and 4N-grade erbium chloride, and can increase the qualified rate of products of 4N-grade europium chloride and 4N-grade erbium chloride.

Description

technical field [0001] The invention relates to an extraction and separation process for co-producing pure europium and pure erbium by fractional distillation and extraction. 4N grade Europium chloride aqueous solution and 4N grade erbium chloride aqueous solution are two high-purity products. The specific technical field to which the invention belongs is the preparation of 4N-grade europium chloride and 4N-grade erbium chloride by fractional distillation extraction. Background technique [0002] In the separation process of ion adsorption rare earth ores, a solution rich in europium chloride (ie, the hydrochloride of europium enrichment) and a solution rich in erbium chloride (also known as crude erbium chloride) are usually obtained. Europium chloride-rich is the main raw material for the preparation of pure europium, and erbium-rich chloride is the main raw material for the preparation of pure erbium. However, the existing extraction and separation process for preparing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B59/00
CPCC22B59/00C22B3/3842Y02P10/20
Inventor 钟学明李艳容徐玉娜
Owner NANCHANG HANGKONG UNIVERSITY
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