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Separation method for co-producing pure neodymium and pure lutetium by fractional extraction

A separation method and extraction technology, which is applied in the field of preparation of 4N-grade neodymium chloride and 5N-grade lutetium chloride by the fractional distillation extraction method, can solve the problems of high product qualification rate, low product qualification rate, poor process stability, etc., and achieve the degree of greening High efficiency, reduced alkali consumption, and improved pass rate

Inactive Publication Date: 2018-12-07
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0005] A separation method for fractional extraction and co-production of pure neodymium and pure lutetium according to the present invention aims at the existing fractional distillation extraction process for preparing 4N-grade neodymium chloride and 5N-grade lutetium chloride, which has large acid-base consumption, poor process stability, and low product qualification rate Insufficient to provide a method for co-producing 4N-grade neodymium chloride and 5N-grade lutetium chloride with low acid-base consumption and high product qualification rate

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  • Separation method for co-producing pure neodymium and pure lutetium by fractional extraction

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Experimental program
Comparison scheme
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 the 2N-grade neodymium chloride solution is 3, and the concentrations of rare earth elements are: La 0.030g / L, Ce 0.10g / L, Pr0.50g / L, Nd 140.0g / L, Sm 0.050g / L, Eu 0.030g / L, Gd 0.010g / L.

[0033] The pH of the 2N grade lutetium chloride solution is 3, and the concentrations of rare earth elements are: Er 0.003g / L, Tm 0.20g / L, Yb0.50g / L, Lu 165.0g / L, Ti 0.060g / L, Th 0.060g / L.

[0034] Step 1: Fractional distillation and extraction to separate LaCePrNd / NdSmEuGd

[0035] The saponified P229 organic phase is used as the extraction organic phase, the 2N-grade neodymium chloride solution is used as the first feed solution, and 3.0mol / L HCl is used as the washing acid. The saponified P229 organic phase enters the LaCePrNd / NdSmEuGd fractional extraction system from the first stage, the first feed liquid enters the ...

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 the 2N-grade neodymium chloride solution is 4, and the concentrations of rare earth elements are: La 0.050g / L, Ce 0.020g / L, Pr1.0g / L, Nd 135.0g / L, Sm 0.10g / L, Eu 0.050g / L, Gd 0.030g / L.

[0052] The pH of 2N-grade lutetium chloride solution is 2, and the concentrations of rare earth elements are: Er 0.0050g / L, Tm 0.50g / L, Yb 1.0g / L, Lu 170.0g / L, Ti 0.10g / L, Th 0.10g / L.

[0053] Step 1: Fractional distillation and extraction to separate LaCePrNd / NdSmEuGd

[0054] The saponified P229 organic phase is used as the extraction organic phase, the 2N-grade neodymium chloride solution is used as the first feed solution, and 3.0mol / L HCl is used as the washing acid. The saponified P229 organic phase enters the LaCePrNd / NdSmEuGd fractional extraction system from the first stage, the first feed liquid enters the LaCePr...

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 the 2N-grade neodymium chloride solution is 2, and the concentrations of rare earth elements are: La 0.010g / L, Ce 0.050g / L, Pr0.20g / L, Nd 145.0g / L, Sm 0.020g / L, Eu 0.010g / L, Gd 0.005g / L.

[0071] The pH of the 2N-grade lutetium chloride solution is 4, and the concentrations of rare earth elements are: Er 0.001g / L, Tm 0.050g / L, Yb 0.10g / L, Lu 160.0g / L, Ti 0.030g / L, Th 0.030g / L.

[0072] Step 1: Fractional distillation and extraction to separate LaCePrNd / NdSmEuGd

[0073] The saponified P229 organic phase is used as the extraction organic phase, the 2N-grade neodymium chloride solution is used as the first feed solution, and 3.0mol / L HCl is used as the washing acid. The saponified P229 organic phase enters the LaCePrNd / NdSmEuGd fractional extraction system from the first stage, the first feed liquid enters t...

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Abstract

The invention provides a separation method for co-producing pure neodymium and pure lutetium by fractional extraction. The separation method is characterized in that P229 is used as an extraction agent, a 2N-grade neodymium chloride solution is used as the first kind of material solution, and a 2N-grade lutetium chloride solution is used as the second kind of material solution; and the separationmethod is composed of six steps of carrying out LaCePrNd / NdSmEuGd fractional extraction separation, carrying out ErTmYbLu / LuTiTh fractional extraction separation, carrying out LaCePr / Nd full-load fractional extraction separation, carrying out Nd / SmEuGd full-load fractional extraction separation, carrying out ErTmYb / Lu full-load fractional extraction separation and carrying out Lu / TiTh fractional extraction separation. According to the separation method, the pure product of the 4N-grade neodymium chloride water solution and the pure product of the 5N-grade lutetium chloride water solution are obtained at the same time through one fractional extraction separation technological process, and the characteristics that the acid-base consumption is low, the process stability is good, the product percent of pass is high, the degree of environmental friendliness is high, the separation process is short, the production cost is low and the like are achieved.

Description

technical field [0001] The invention relates to a separation method for fractional extraction and co-production of pure neodymium and pure lutetium. Specifically, P229 is used as the extraction agent, 2N-grade neodymium chloride solution is the first feed liquid, and 2N-grade lutetium chloride solution is the second feed liquid. , to prepare 4N grade neodymium chloride aqueous solution and 5N grade lutetium chloride aqueous solution. The invention belongs to the technical field of preparing 4N-grade neodymium chloride and 5N-grade lutetium chloride by a fractional distillation extraction method. Background technique [0002] During the rare earth separation process, 2N-grade neodymium chloride solution and 2N-grade lutetium chloride solution can be obtained. At present, the process of extracting and separating 2N-grade neodymium chloride solution to prepare 4N-grade neodymium chloride products is independent; the process of extracting and separating 2N-grade lutetium chlori...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/38
CPCC22B59/00C22B3/3846Y02P10/20
Inventor 钟学明徐玉娜
Owner NANCHANG HANGKONG UNIVERSITY
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