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Technological method of full load fractional extracting and separating rare earths

A process method and rare earth technology, which are applied in the fields of fractional extraction and separation of rare earths, and full-load fractionation extraction and separation of rare earths, to achieve the effects of eliminating adverse side effects, reducing acid-base consumption and improving quality

Inactive Publication Date: 2015-04-22
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is aimed at the side effects produced during hydrogen ion washing in the existing rare earth fractionation extraction process, and proposes a process method for separating rare earths by fractional distillation extraction with full load, so as to eliminate the side effects of hydrogen ion washing, reduce the acid-base consumption of rare earth separation, improve Fractionation Extraction Stage Efficiency, Reduced Cost of Rare Earth Separation

Method used

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  • Technological method of full load fractional extracting and separating rare earths

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Effect test

Embodiment 1

[0026] Full-load fractional distillation extraction ~ Nd / Sm ~ group separation of yttrium-europium-rich ore

[0027] 1) Rare earth liquid

[0028] The rare earth chloride aqueous solution of medium yttrium and europium-rich ore is used as the feed solution, the rare earth concentration in the rare earth feed solution is 1.5 M, and the pH value is 3. In terms of rare earth elements, the molar fraction of light rare earth elements (La~Nd) is 0.55, and the molar fraction of medium and heavy rare earth elements (Sm~Lu and Y) is 0.45.

[0029] 2) Rare earth extraction organic phase

[0030] The rare earth extraction organic phase is a kerosene solution of P507, and the volume percentage concentration of P507 is 36%; it is added to the fractionation extraction system in the form of light rare earth saponification organic phase, and the saponification degree is 35%.

[0031] 3) Washing liquid

[0032] The washing solution is an aqueous solution of medium and heavy rare earth eleme...

Embodiment 2

[0045] Separation of lanthanum and cerium by fractional distillation under full load

[0046] 1) Rare earth liquid

[0047] The aqueous solution of lanthanum and cerium chloride was used as the feed solution, the rare earth concentration in the rare earth feed solution was 1.0 M, and the pH value was 5. In terms of rare earth elements, the mole fraction of lanthanum is 0.40, and the mole fraction of cerium is 0.60.

[0048] 2) Rare earth extraction organic phase

[0049] The organic phase of rare earth extraction is kerosene solution of P204, and the concentration of P204 is 30% by volume; it is added to the fractionation extraction system in the form of lanthanum saponified organic phase, and the degree of saponification is 40%.

[0050] 3) Washing liquid

[0051] The washing solution is an aqueous solution of cerium, which is obtained from the aqueous phase at the outlet of the acid extraction section; the rare earth concentration in the washing solution is 0.8696 M, and ...

Embodiment 3

[0064] Separation of Praseodymium and Neodymium by Fractional Distillation at Full Load

[0065] 1) Rare earth liquid

[0066] The aqueous solution of praseodymium and neodymium chloride was used as the feed solution, the rare earth concentration in the rare earth feed solution was 0.8 M, and the pH value was 2. In terms of rare earth elements, the mole fraction of praseodymium is 0.30, and the mole fraction of neodymium is 0.70.

[0067] 2) Rare earth extraction organic phase

[0068] The rare earth extraction organic phase is a sulfonated kerosene solution of P507, and the volume percentage concentration of P507 is 30%; it is added to the fractionation extraction system in the form of praseodymium saponification organic phase, and the saponification degree is 45%.

[0069] 3) Washing liquid

[0070] The washing solution is an aqueous solution of neodymium, which is obtained from the aqueous phase at the outlet of the acid extraction section; the rare earth concentration i...

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Abstract

The invention relates to a technological method of full load fractional extracting and separating rare earths. According to the technological method disclosed by the invention, P507 or P204 serves as a rare earth extractant; in a fractional extraction separation technology, N235 serves as an acid extraction agent, and a mixed alcohol serves as an acid extraction segment of an N235 organic phase regulator; an easily-extracted rare earth component solution with a pH value to be 1-4 serves as a washing solution; by virtue of the acid extraction action of the N235 in the acid extraction segment, the side effects of hydrogen ion washing are eliminated, so that the separation factor of the rare earths is ensured not to be lowered, and the extraction quantity of the extractant in a fractional extraction system is also ensured. Compared with the traditional fractional extraction separation technology, the acid and alkali consumption in the process of the rare earth separation technology can be greatly lowered, wherein the consumption of a basic reagent is lowered by 34-62 percent, and the consumption of hydrochloride is lowered by 16-29 percent; the waste water discharge in the process of the rare earth extraction separation technology is greatly reduced, the greening degree of rare earth separation is greatly increased; the grade amount of extraction tank is reduced by 22-46 percent, the total investment of the rare earth extraction separation technology is lowered; the separation cost is greatly lowered.

Description

technical field [0001] The invention relates to a process method for extracting and separating rare earths by fractional distillation with full load, in particular to a method using chlorinated mixed rare earth material liquid as a raw material, P507 or P204 as a rare earth extraction agent, tertiary amine N235 as an acid extraction agent, and the extraction amount of rare earths is not less than that of rare earths Saponification fractional extraction and separation of rare earth technology. The invention belongs to the field of solvent extraction in hydrometallurgy. Background technique [0002] Rare earth elements are extremely important high-tech strategic materials, so the separation of rare earth elements has attracted much attention. At present, the industrial separation of rare earth elements adopts the fractional distillation extraction method. Usually, 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (trade name P507) or bis(2-ethylhexyl) phosphoric acid (trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/40
CPCY02P10/20
Inventor 钟学明
Owner NANCHANG HANGKONG UNIVERSITY
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