Extraction and separation technology for fractional extraction co-production of pure europium and pure erbium

An extraction and process technology, applied in the field of extraction and separation process, can solve the problems of high acid and alkali consumption, low product qualification rate, poor process stability, etc., and achieve the effect of reducing acid and alkali consumption, reducing alkali consumption and improving qualification rate

Inactive Publication Date: 2018-12-21
NANCHANG HANGKONG UNIVERSITY
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  • Description
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Problems solved by technology

[0004] The present invention aims at the shortcomings of the existing extraction and separation process for preparing pure europium by using rich europium chloride as raw material and the extraction and separation process for preparing pure erbium by using rich erbium chloride as raw material for large acid and alkali consumption, poor process stability and low product qualification rate , proposed an extraction and separation process for fractional extraction and co-production of pure europium and pure erbium

Method used

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  • Extraction and separation technology for fractional extraction co-production of pure europium and pure erbium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The saponified C272 organic phase is 30% by volume of C272 in the kerosene solution of the extractant C272, and the saponification rate is 36%.

[0032] The pH of the europium-rich chloride solution is 3, and the concentrations of rare earth elements 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.

[0033] The pH of erbium-rich chloride is 3, and the concentrations of rare earth elements are: Gd 0.0030g / L, Tb 0.050g / L, Dy 0.30g / L, Ho 35.0g / L, Y0.030g / L, Er 90.0g / L , Tm 25.0g / L, Yb 0.20g / L, Lu 0.10g / L.

[0034] Step 1, Fractional distillation and extraction to separate PrNdSmEu / EuGdTbDy:

[0035] The saponified C272 organic phase is used as the extraction organic phase, the europium-rich chloride solution is used as the first feed solution, and 3.0mol / L HCl is used as the washing acid. The saponified C272 organic phase enters the PrNdSmEu / EuGdTbDy fractional distillation extraction system from the first stage, the first feed l...

Embodiment 2

[0050] The saponified C272 organic phase is 30% by volume of C272 in the kerosene solution of the extractant C272, and the saponification rate is 36%.

[0051] The pH of the europium-rich chloride solution is 2, and the concentrations of rare earth elements 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.

[0052] The pH of erbium-rich chloride is 4, and the concentrations of rare earth elements are: Gd 0.0050g / L, Tb 0.10g / L, Dy 0.50g / L, Ho 50.0g / L, Y0.050g / L, Er 70.0g / L , Tm 35.0g / L, Yb 0.50g / L, Lu 0.30g / L.

[0053] Step 1, Fractional distillation and extraction to separate PrNdSmEu / EuGdTbDy:

[0054] The saponified C272 organic phase is used as the extraction organic phase, the europium-rich chloride solution is used as the first feed solution, and 3.0mol / L HCl is used as the washing acid. The saponified C272 organic phase enters the PrNdSmEu / EuGdTbDy fractional distillation extraction system from the first stage, the first feed li...

Embodiment 3

[0069] The saponified C272 organic phase is 30% by volume of C272 in the kerosene solution of the extractant C272, and the saponification rate is 36%.

[0070] The pH of the europium-rich chloride solution is 4, and the concentrations of rare earth elements 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.

[0071] The pH of erbium-rich chloride is 2, and the concentrations of rare earth elements are: Gd 0.0010g / L, Tb 0.030g / L, Dy 0.10g / L, Ho 20.0g / L, Y0.010g / L, Er 110.0g / L , Tm 15.0g / L, Yb 0.10g / L, Lu 0.050g / L.

[0072] Step 1, Fractional distillation and extraction to separate PrNdSmEu / EuGdTbDy:

[0073] The saponified C272 organic phase is used as the extraction organic phase, the europium-rich chloride solution is used as the first feed solution, and 3.0mol / L HCl is used as the washing acid. The saponified C272 organic phase enters the PrNdSmEu / EuGdTbDy fractional distillation extraction system from the first stage, the first fe...

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Abstract

The invention discloses an extraction and separation technology for fractional extraction co-production of pure europium and pure erbium. According to the extraction and separation technology, C272 serves as an extraction agent, an europium-rich chloride solution serves as a first feed liquid, and an erbium-rich chloride solution serves as a second feed liquid. The extraction and separation technology comprises the six steps of fractional extraction separation of PrNdSmEu and EuGdTbDy, fractional extraction separation of GdTbDyHoYEr/ErTmYbLu, full-loaded fractional extraction separation of PrNdSm/Eu, full-loaded fractional extraction separation of Eu/GdTbDy, full-loaded fractional extraction separation of GdTbDyHoY/Er and fractional extraction separation of Er/TmYbLu. Two high-purity products of 4N-grade europium chloride and 4N-grade erbium chloride are simultaneously obtained through one extraction and separation technology. Through the extraction and separation technology, the consumption of acid and alkali for preparing the 4N-grade europium chloride and the 4N-grade erbium chloride can be lowered, and the product percent of pass of the 4N-grade europium chloride and the 4N-grade erbium chloride can be improved.

Description

technical field [0001] The present invention is an extraction and separation process for fractional extraction and co-production of pure europium and pure erbium, which involves using C272 as the extraction agent, the europium-rich chloride solution as the first feed liquid, and the erbium-chloride rich solution as the second feed liquid. Two high-purity products, 4N-grade europium chloride aqueous solution and 4N-grade erbium chloride aqueous solution, were prepared. The specific technical field to which the invention belongs is the preparation of 4N-grade europium chloride and 4N-grade erbium chloride by a fractional distillation extraction method. Background technique [0002] In the separation process of ion-adsorption type rare earth ores, a solution rich in europium chloride (that is, the hydrochloride of europium concentrate) and an erbium-rich chloride solution (also known as crude erbium chloride) solution are usually obtained. Europium-enriched chloride is the mai...

Claims

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Application Information

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Patent Type & Authority Applications(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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