Extraction and separation method for co-producing 4N dysprosium and 4N ytterbium

A separation method and extraction technology, which are applied in the field of preparing 4N-grade dysprosium chloride and 4N-grade ytterbium chloride by fractionation extraction method, can solve the problems of low qualification rate of 4N-grade products, poor process stability, low acid-base consumption, etc. The effect of increasing the rate, reducing the consumption of acid and alkali, and reducing the consumption of alkali

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

[0005] An extraction and separation method for the co-production of 4N dysprosium and 4N ytterbium in the present invention aims at the existence of large acid and alkali consumption, poor process stability, and relatively low pass rate of 4N grade products in the existing fractional dis

Method used

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  • Extraction and separation method for co-producing 4N dysprosium and 4N ytterbium

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 2N-grade dysprosium chloride solution is 3, and the concentrations of rare earth elements are: Gd 0.030g / L, Tb 0.20g / L, Dy160.0g / L, Ho 0.30g / L, Y 0.10g / L, Er 0.060g / L, Tm 0.030g / L.

[0033] The enrichment thulium ytterbium lutetium chloride solution has a pH of 3, and the concentrations of rare earth elements are: Ho 0.040g / L, Y 0.20g / L, Er 2.0g / L, Tm 16.0g / L, Yb 130.0g / L, Lu 18.0g / L.

[0034] Step 1: Fractional distillation and extraction to separate GdTbDy / DyHoYErTm

[0035] The saponified C272 organic phase is used as the extraction organic phase, the 2N grade dysprosium 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 GdTbDy / DyHoYErTm fractionation 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 2N-grade dysprosium chloride solution is 2, and the concentrations of rare earth elements are: Gd 0.050g / L, Tb 0.40g / L, Dy165.0g / L, Ho 0.70g / L, Y 0.20g / L, Er 0.10g / L, Tm 0.050g / L.

[0052] The enrichment thulium ytterbium lutetium chloride solution has a pH of 4, and the concentrations of rare earth elements are: Ho 0.0060g / L, Y 0.30g / L, Er 3.0g / L, Tm 18.0g / L, Yb 125.0g / L, Lu 20.0g / L.

[0053] Step 1: Fractional distillation and extraction to separate GdTbDy / DyHoYErTm

[0054] The saponified C272 organic phase is used as the extraction organic phase, the 2N grade dysprosium 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 GdTbDy / DyHoYErTm fractionation extraction system from the first stage, the first feed l...

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 2N grade dysprosium chloride solution is 4, and the concentrations of rare earth elements are: Gd 0.010g / L, Tb 0.050g / L, Dy155.0g / L, Ho 0.10g / L, Y 0.050g / L, Er 0.020g / L, Tm 0.010g / L.

[0071] The enrichment thulium ytterbium lutetium chloride solution has a pH of 2, and the concentrations of rare earth elements are: Ho 0.0020g / L, Y 0.10g / L, Er 1.0g / L, Tm 14.0g / L, Yb 135.0g / L, Lu 16.0g / L.

[0072] Step 1: Fractional distillation and extraction to separate GdTbDy / DyHoYErTm

[0073] The saponified C272 organic phase is used as the extraction organic phase, the 2N grade dysprosium 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 GdTbDy / DyHoYErTm fractionation extraction system from the first stage, the first fee...

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Abstract

The invention relates to an extraction and separation method for co-producing 4N dysprosium and 4N ytterbium. C272 is taken as an extracting agent, 2N-grade dysprosium chloride solution is taken as afirst material solution, and an enriched thulium-ytterbium-lutetium chloride solution is taken as a second material solution; the method comprises the following six steps that GdTbDy/Dy HoYErTm are separated through fractional extraction; HoYErTmYb/YbLu are separated through the fractional extraction; GdTb/Dy are separated through full-load fractional extraction, Dy/HoYErTm are separated through the full-load fractional extraction, HoYErTm/Tb are separated through the full-load fractional extraction, and Yb/Lu are separated through the full-load fractional extraction. According to the method,the 4N-grade dysprosium chloride water solution, an aqueous solution of the 4N-grade ytterbium chloride and a 2N-grade lutetium chloride product are obtained at the same time through one extraction and separation technological process; and the method has the characteristics that the acid-base consumption is low, the process stability is good, the product percent of pass is high, environmental friendliness degree is high, the separation process is short, production cost is low.

Description

technical field [0001] The invention relates to an extraction and separation method for the co-production of 4N dysprosium and 4N ytterbium. Specifically, C272 is used as the extraction agent, the 2N grade dysprosium chloride solution is the first feed liquid, and the enriched thulium, ytterbium and lutetium chloride solution is the second. Feed liquid, preparing 4N-grade dysprosium chloride aqueous solution and 4N-grade ytterbium chloride aqueous solution, and simultaneously obtaining 2N-grade lutetium products and thulium enriched products. The invention belongs to the technical field of preparing 4N grade dysprosium chloride and 4N grade ytterbium chloride by a fractional distillation extraction method. Background technique [0002] Medium yttrium and europium-rich rare earth ores are currently the main ion-adsorption rare earth minerals mined. In the extraction and separation process of medium yttrium and europium-rich rare earth ores, a 2N grade dysprosium chloride sol...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/38
CPCC22B59/00C22B3/3842Y02P10/20
Inventor 李艳容钟学明
Owner NANCHANG HANGKONG UNIVERSITY
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