A kind of p204 extraction and separation method for preparing 5n neodymium

A separation method and extraction technology, which is applied in the field of extraction and separation of P204 for the preparation of 5N neodymium, and in the field of extraction and separation technology for the preparation of neodymium products with a purity ≥ 99.999%, which can solve problems such as failure to achieve ideals, and achieve industrial production and high yields of neodymium products , The effect of less consumption of chemical reagents

Inactive Publication Date: 2018-04-06
NANCHANG HANGKONG UNIVERSITY
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  • Description
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Problems solved by technology

Although many scientific and technical personnel have made various efforts and attempts to improve the traditional process of fractionating and extracting neodymium, they have not achieved ideal results so far.

Method used

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  • A kind of p204 extraction and separation method for preparing 5n neodymium

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Experimental program
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Effect test

Embodiment 1

[0034] 1) PrNd / NdSm separation section

[0035] The first step is the PrNd / NdSm full-load fractionation extraction separation section to realize the separation of PrNd / NdSm. The P204 saponified organic phase with a saponification rate of 0.36 from the seventh step enters from the first stage of the PrNd / NdSm full-load fractionation extraction system, the rare earth concentration is 1.0 mol / L, the ratio of the molar concentration of neodymium to the molar concentration of rare earth is 0.999, and the pH value The neodymium chloride feed solution of 4 enters from the fifth stage of the PrNd / NdSm full-load fractionation extraction system, and the raffinate aqueous phase neodymium samarium chloride solution from the third step acid extraction section enters the PrNd / NdSm full-load from the 45th stage as a detergent Fractional distillation extraction system. The PrNd feed liquid is obtained from the first-stage raffinate aqueous phase of the PrNd / NdSm full-load fractionation extra...

Embodiment 2

[0054] 1) PrNd / NdSm separation section

[0055] The first step is the PrNd / NdSm full-load fractionation extraction separation section to realize the separation of PrNd / NdSm. The P204 saponified organic phase with a saponification rate of 0.36 from the seventh step enters from the first stage of the PrNd / NdSm full-load fractionation extraction system, the rare earth concentration is 1.2 mol / L, the ratio of the molar concentration of neodymium to the molar concentration of rare earth is 0.9995, and the pH value The neodymium chloride feed liquid of 3 enters from the fifth stage of the PrNd / NdSm full-load fractionation extraction system, and the raffinate aqueous phase neodymium samarium chloride solution from the third step acid extraction section enters the PrNd / NdSm full-load from the 47th stage as a detergent Fractional distillation extraction system. The PrNd feed liquid is obtained from the first-stage raffinate aqueous phase of the PrNd / NdSm full-load fractionation extrac...

Embodiment 3

[0074] 1) PrNd / NdSm separation section

[0075] The first step is the PrNd / NdSm full-load fractionation extraction separation section to realize the separation of PrNd / NdSm. The P204 saponified organic phase with a saponification rate of 0.36 from the seventh step enters from the first stage of the PrNd / NdSm full-load fractionation extraction system, the rare earth concentration is 0.8 mol / L, the ratio of the molar concentration of neodymium to the molar concentration of rare earth is 0.995, and the pH value The neodymium chloride feed liquid of 5 enters from the sixth stage of the PrNd / NdSm full-load fractionation extraction system, and the raffinate aqueous phase neodymium samarium chloride solution from the third step acid extraction section enters the PrNd / NdSm full-load from the 50th stage as a detergent Fractional distillation extraction system. The PrNd feed liquid is obtained from the first-stage raffinate aqueous phase of the PrNd / NdSm full-load fractionation extract...

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Abstract

A kind of P204 extraction and separation method for preparing 5N neodymium of the present invention, with P204 as extraction agent, neodymium chloride as feed liquid, comprises 7 steps, wherein 3 separation steps and 4 auxiliary steps; 3 separation steps are respectively PrNd / NdSm full-load fractionation extraction and separation section, Pr / Nd quasi-fractionation extraction and separation section, Nd / Sm fractionation extraction and separation section, and four auxiliary process steps are concentration section, acid extraction section, stripping section and rare earth saponification section. Finally, 5N neodymium products, praseodymium-rich products and samarium-rich products are obtained, among which the relative purity of the neodymium product phase is as high as 99.999%-99.9995%, and the yield is as high as 91.64%-94.40%. Compared with the preparation of high-purity neodymium products by non-solvent extraction methods such as resin column chromatography and ion exchange, the present invention has the advantages of high purity of neodymium products, high yield of neodymium products, large production scale, low consumption of chemical reagents, and easy automation , easy to operate, low production cost, conducive to industrial production and other advantages.

Description

technical field [0001] The invention relates to a P204 extraction and separation method for preparing 5N neodymium, in particular to an acidic phosphorus reagent P204 as a rare earth extractant, and a neodymium chloride solution with a relative purity of 99.5% to 99.95% as a feed solution to prepare a neodymium product with a purity ≥ 99.999% The extraction and separation process method. The invention belongs to the field of rare earth separation in solvent extraction. Background technique [0002] Neodymium is one of the rare earth elements with important uses, and is widely used in high-tech fields such as laser materials, permanent magnet materials, and ceramic materials. The purity of neodymium products is a key factor affecting the performance and function of neodymium materials, so it is of great significance to improve the purity of neodymium products. [0003] Neodymium products with a relative purity (also known as the relative purity of rare earths, often referre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B3/42C22B59/00
CPCC22B3/42C22B59/00C22B3/3846Y02P10/20
Inventor 钟学明程子彪陈璇
Owner NANCHANG HANGKONG UNIVERSITY
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