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Extraction separation method for co-production of 4N holmium and 5N ytterbium

A separation method and extraction technology are applied in the field of extraction and separation of co-production of 4N holmium and 5N ytterbium, and can solve the problems of large acid-base consumption, low qualification rate of 4N-grade holmium chloride products, and poor process stability of 4N-grade holmium chloride. , to achieve the effect of reducing acid-base consumption, improving qualification rate and improving stability

Inactive Publication Date: 2018-12-18
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

Since the existing fractional distillation, extraction and separation processes for preparing 4N-grade holmium chloride and 5N-grade ytterbium chloride are carried out independently, there are large acid and alkali consumption, poor process stability of 4N-grade holmium chloride, and 4N-grade holmium chloride products. Insufficient pass rate is low (the pass rate of 4N grade holmium chloride is about 65%)

Method used

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  • Extraction separation method for co-production of 4N holmium and 5N ytterbium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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%.

[0030] The pH of the 2N grade holmium chloride solution is 3, and the concentrations of rare earth elements are: Tb 0.050g / L, Dy 0.10g / L, Ho155.0g / L, Y 0.30g / L, Er 0.10g / L, Tm 0.030g / L.

[0031] The pH of 2N-grade ytterbium chloride is 3, and the concentrations of rare earth elements are: Y 0.020g / L, Er 0.050g / L, Tm 0.10g / L, Yb 160.0g / L, Lu 0.30g / L.

[0032] Step 1: Fractional distillation and extraction to separate TbDyHo / HoYErTm

[0033] The saponified P229 organic phase is used as the extraction organic phase, the 2N grade holmium 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 TbDyHo / HoYErTm fractional extraction system from the first stage, the first feed liquid enters the TbDyHo / HoYErTm fractional extraction system from the...

Embodiment 2

[0048] 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%.

[0049] The pH of the 2N-grade holmium chloride solution is 2, and the concentrations of rare earth elements are Tb0.10g / L, Dy 0.30g / L, Ho160.0g / L, Y 0.50g / L, Er 0.20g / L, Tm 0.050g / L L.

[0050] The pH of 2N-grade ytterbium chloride is 4, and the concentrations of rare earth elements are: Y 0.050g / L, Er 0.10g / L, Tm 0.30g / L, Yb 155.0g / L, Lu 0.70g / L.

[0051] Step 1: Fractional distillation and extraction to separate TbDyHo / HoYErTm

[0052]The saponified P229 organic phase is used as the extraction organic phase, the 2N grade holmium 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 TbDyHo / HoYErTm fractionation extraction system from the first stage, the first feed liquid enters the TbDyHo / HoYErTm fractionation extraction system from t...

Embodiment 3

[0067] 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%.

[0068] The pH of the 2N-grade holmium chloride solution is 4, and the concentrations of rare earth elements are: Tb 0.010g / L, Dy 0.050g / L, Ho150.0g / L, Y 0.10g / L, Er 0.050g / L, Tm 0.010g / L.

[0069] The pH of 2N-grade ytterbium chloride is 2, and the concentrations of rare earth elements are: Y 0.010g / L, Er 0.020g / L, Tm 0.050g / L, Yb 165.0g / L, Lu 0.10g / L.

[0070] Step 1: Fractional distillation and extraction to separate TbDyHo / HoYErTm

[0071] The saponified P229 organic phase is used as the extraction organic phase, the 2N grade holmium 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 TbDyHo / HoYErTm fractionation extraction system from the first stage, the first feed liquid enters the TbDyHo / HoYErTm fractionation extraction system...

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Abstract

The invention discloses an extraction separation method for co-production of 4N holmium and 5N ytterbium. The extraction separation method comprises the steps of adopting P229 as an extraction agent,adopting a 2N-grade holmium chloride solution as first feed liquid, and adopting 2N-grade ytterbium chloride as second feed liquid; carrying out fractional extraction for separating TbDyHo / HoYErTm, carrying out fractional extraction for separating YErTmYb / YbLu, carrying out full-load fractional extraction for separating TbDy / Ho, carrying out full-load fractional extraction for separating Ho / YErTm,carrying out full-load fractional extraction for separating YErTm / Yb, and carrying out fractional extraction for separating Yb / Lu. According to the extraction separation method for co-production of the 4N holmium and the 5N ytterbium provided by the invention, the acid and alkali consumption for preparing 4N-grade holmium chloride and 5N-grade ytterbium chloride can be reduced, and the product qualification rate of the 4N-grade holmium chloride can be improved.

Description

technical field [0001] The invention relates to an extraction and separation method for the co-production of 4N holmium and 5N ytterbium, specifically involving the use of P229 as the extraction agent, 2N grade holmium chloride solution as the first feed liquid, and 2N grade ytterbium chloride as the second feed liquid. Two high-purity products, 4N grade holmium chloride aqueous solution and 5N grade ytterbium chloride aqueous solution, were prepared. The specific technical field to which the invention belongs is the preparation of 4N-grade holmium chloride and 5N-grade ytterbium chloride by a fractional distillation extraction method. Background technique [0002] At present, the extraction and separation process for preparing 4N-grade holmium chloride products and the fractional distillation, extraction and separation process for preparing 5N-grade ytterbium chloride are not related to each other in terms of separation technology, and the two processes are independent of e...

Claims

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Application Information

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IPC IPC(8): C22B3/38C22B59/00
CPCC22B59/00C22B3/3844
Inventor 李艳容钟学明
Owner NANCHANG HANGKONG UNIVERSITY
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