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A separation method for fractional distillation extraction co-production of pure samarium and pure terbium

A separation method and extraction technology, which is applied in the separation field of fractional extraction and co-production of pure samarium and pure terbium, can solve the problems of low pass rate of 4N grade products, poor process stability, large acid and alkali consumption, etc., and achieve saving of neutralization reagents, The effect of improving the qualified rate and reducing the consumption of acid and alkali

Inactive Publication Date: 2020-07-28
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] A separation method for fractional extraction and co-production of pure samarium and pure terbium according to the present invention aims at the existing fractional distillation extraction process for preparing 4N-grade samarium chloride and 4N-grade terbium chloride, which has large acid-base consumption, poor process stability, and 4N-grade product qualification rate Low disadvantages, providing a method for co-producing 4N-grade samarium chloride and 4N-grade terbium chloride with low acid-base consumption and high pass rate of 4N-grade products

Method used

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  • A separation method for fractional distillation extraction co-production of pure samarium and pure terbium

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The organic phase of saponified P229 is 30% by volume of P229 in the kerosene solution of extractant P229, and the saponification rate is 36%.

[0032] The pH of 2N-3N samarium chloride solution is 3, and the concentrations of rare earth elements are: Pr 0.030g / L, Nd 0.30g / L, Sm 150.0g / L, Eu 0.50g / L, Gd 0.050g / L.

[0033] The pH of 1N grade terbium chloride solution is 2~4, and the concentrations of rare earth elements are: Sm 0.50g / L, Eu 1.0g / L, Gd5.0g / L, Tb 150.0g / L, Dy 0.30g / L, Ho 0.050g / L, Y 0.030g / L.

[0034] Step 1: Separation of PrNdSm / SmEuGd by Fractional Distillation Extraction

[0035] The saponified P229 organic phase is used as the extracted organic phase, the 2N-3N grade samarium chloride solution is used as the first feed liquid, and 3.0mol / L HCl is used as the washing acid. The saponified P229 organic phase enters the PrNdSm / SmEuGdY fractional distillation extraction system from the first stage, the first feed liquid enters the PrNdSm / SmEuGd fractional ...

Embodiment 2

[0050] The organic phase of saponified P229 is 30% by volume of P229 in the kerosene solution of extractant P229, and the saponification rate is 36%.

[0051] The pH of 2N-3N samarium chloride solution is 4, and the concentrations of rare earth elements are: Pr 0.05g / L, Nd 0.5g / L, Sm145.0g / L, Eu 0.80g / L, Gd 0.10g / L.

[0052] The pH of 1N-grade terbium chloride solution is 4, and the concentrations of rare earth elements are: Sm 1.0g / L, Eu 2.0g / L, Gd 10.0g / L, Tb 140.0g / L, Dy 0.50g / L, Ho 0.10g / L, Y 0.050g / L.

[0053] Step 1: Separation of PrNdSm / SmEuGd by Fractional Distillation Extraction

[0054] The saponified P229 organic phase is used as the extracted organic phase, the 2N-3N grade samarium chloride solution is used as the first feed liquid, and 3.0mol / L HCl is used as the washing acid. The saponified P229 organic phase enters the PrNdSm / SmEuGd fractional extraction system from the first stage, the first material liquid enters the PrNdSm / SmEuGd fractional extraction syst...

Embodiment 3

[0069] The organic phase of saponified P229 is 30% by volume of P229 in the kerosene solution of extractant P229, and the saponification rate is 36%.

[0070] The pH of 2N~3N samarium chloride solution is 2, and the concentrations of rare earth elements are: Pr 0.01g / L, Nd 0.10g / L, Sm155.0g / L, Eu 0.10g / L, Gd 0.010g / L.

[0071] The pH of 1N-grade terbium chloride solution is 2, and the concentrations of rare earth elements are: Sm 0.10g / L, Eu 0.50g / L, Gd 1.0g / L, Tb 160.0g / L, Dy 0.10g / L, Ho 0.010g / L, Y 0.010g / L.

[0072] Step 1: Separation of PrNdSm / SmEuGd by Fractional Distillation Extraction

[0073] The saponified P229 organic phase is used as the extracted organic phase, the 2N-3N grade samarium chloride solution is used as the first feed liquid, and 3.0mol / L HCl is used as the washing acid. The saponified P229 organic phase enters the PrNdSm / SmEuGd fractional extraction system from the 1st stage, the first feed liquid enters the PrNdSm / SmEuGd fractional extraction system...

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Abstract

The present invention is a separation method for fractional extraction and co-production of pure samarium and pure terbium, which uses P229 as the extraction agent, 2N-3N grade samarium chloride solution as the first feed liquid, and 1N grade terbium chloride solution as the second feed liquid There are six steps: separation of PrNdSm / SmEuGd by fractional distillation extraction, separation of SmEuGdTb / TbDyHoY by fractional distillation extraction, separation of PrNd / Sm by fractional distillation extraction, quasi-fractionation extraction of Sm / EuGd, separation of Sm / EuGd / Tb by fractional distillation extraction and separation of Tb / DyHoY by fractional distillation extraction composition. An extraction and separation process of the present invention simultaneously obtains two pure products of 4N-grade samarium chloride aqueous solution and 4N-grade terbium chloride aqueous solution, which have the advantages of low acid-base consumption, good process stability, high product qualification rate, high degree of greening, and high production efficiency. Features such as low cost.

Description

technical field [0001] The invention relates to a separation method for fractional extraction and co-production of pure samarium and pure terbium. Specifically, P229 is used as the extraction agent, 2N-3N grade samarium chloride solution is the first feed liquid, and 1N grade terbium chloride solution is the second one. Feed liquid, simultaneously prepare 4N grade samarium chloride aqueous solution and 4N grade terbium chloride aqueous solution. The invention belongs to the technical field of preparing 4N grade samarium chloride and 4N grade terbium chloride by a fractional distillation extraction method. Background technique [0002] In the rare earth ore separation process, the samarium element is extracted by Sm / Eu / Gd three-outlet fractional distillation to obtain a 2N-3N grade samarium chloride solution, and the terbium element is extracted and separated by Tb / Dy to obtain a 1N grade terbium chloride solution. The 1N grade terbium chloride solution can be extracted and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/38
CPCC22B59/00C22B3/3846Y02P10/20
Inventor 钟学明李艳容徐玉娜
Owner NANCHANG HANGKONG UNIVERSITY
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