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Separation method for fractional extraction co-production of pure samarium and pure terbium

A separation method and extraction technology, which is applied in the separation field of fractional distillation 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: 2018-12-07
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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  • Separation method for fractional extraction co-production of pure samarium and pure terbium

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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 extraction 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 feed liquid enters the PrNdSm / SmEuGd fractional extraction sy...

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 extraction 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 feed liquid enters the PrNdSm / SmEuGd fractional extraction system ...

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 extraction 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 syste...

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Abstract

The invention discloses a separation method for fractional extraction co-production of pure samarium and pure terbium. P229 serves as an extraction agent, a 2N-3N samarium chloride solution serves asa first kind of feed liquid, a 1N-level terbium chloride solution is a second kind of feed liquid, and the method comprises six steps of fractional extraction separation of PrNdSm / SmEuGd, fractional extraction separation of SmEuGdTb / TbDyHoY, fractional extraction separation of PrNd / Sm, quasi fractionation extraction of Sm / EuGd, three-outlet fractional extraction separation of Sm / EuGd / Tb and fractional extraction separation of Tb / DyHoy. Through the extraction separation process flow, two pure products of a 4N-level samarium chloride water solution and a 4N-level terbium chloride water solutioncan be obtained at the same time, and the beneficial effects of being low in acid and alkali consumption, good in process stability, high in product yield, high in greenization degree, low in production cost and the like are achieved.

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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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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