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Technical process for preparing 5N dysprosium through extraction and separation method

A technology of process flow and separation method, applied in the field of rare earth separation in solvent extraction, can solve problems such as the level of 5N not yet reached, and achieve the effects of large production scale, easy operation and high yield of dysprosium products

Inactive Publication Date: 2016-08-17
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not difficult to see that although those skilled in the art are working hard to improve the purity of the dysprosium product prepared by the extraction method, it has not yet reached the 5N level.
The method of preparing 5N dysprosium products by other methods is rarely reported

Method used

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  • Technical process for preparing 5N dysprosium through extraction and separation method
  • Technical process for preparing 5N dysprosium through extraction and separation method
  • Technical process for preparing 5N dysprosium through extraction and separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) TbDy / DyHoY separation section

[0038] The first step is the TbDy / DyHoY full-load fractionation extraction separation section to realize the separation of TbDy / DyHoY. The P229 rare earth saponified organic phase with a saponification rate of 0.36 from the fourth step enters from the first stage of the TbDy / DyHoY full-load fractionation extraction system, the rare earth concentration is 1.0mol / L, the ratio of the molar concentration of dysprosium to the molar concentration of rare earth is 0.999, and the pH The dysprosium chloride feed solution with a value of 3 enters from the 22nd stage of the TbDy / DyHoY full-load fractionation extraction system, and the raffinate aqueous dysprosium chloride, holmium, and yttrium solution from the third step acid extraction section enters the TbDy / DyHoY from the 36th stage as a detergent. DyHoY fully loaded fractional distillation extraction system. The TbDy feed liquid is obtained from the first-stage raffinate aqueous phase of th...

Embodiment 2

[0059] 1) TbDy / DyHoY separation section

[0060]The first step is the TbDy / DyHoY full-load fractionation extraction separation section to realize the separation of TbDy / DyHoY. The P229 rare earth saponification organic phase with a saponification rate of 0.36 from the fourth step enters from the first stage of the TbDy / DyHoY full-load fractionation extraction system, the rare earth concentration is 0.5mol / L, the ratio of the molar concentration of dysprosium to the molar concentration of rare earth is 0.9995, and the pH The dysprosium chloride feed solution with a value of 4 enters from the 22nd stage of the TbDy / DyHoY full-load fractionation extraction system, and the raffinate aqueous dysprosium chloride, holmium, and yttrium solution from the third step acid extraction section enters the TbDy / DyHoY from the 34th stage as a detergent. DyHoY fully loaded fractional distillation extraction system. The TbDy feed liquid is obtained from the first-stage raffinate aqueous phase o...

Embodiment 3

[0081] 1) TbDy / DyHoY separation section

[0082] The first step is the TbDy / DyHoY full-load fractionation extraction separation section to realize the separation of TbDy / DyHoY. The P229 rare earth saponified organic phase with a saponification rate of 0.36 from the fourth step enters from the first stage of the TbDy / DyHoY full-load fractionation extraction system, the rare earth concentration is 1.5mol / L, the ratio of the molar concentration of dysprosium to the molar concentration of rare earth is 0.995, and the pH The dysprosium chloride feed solution with a value of 2 enters from the 27th stage of the TbDy / DyHoY full-load fractionation extraction system, and the raffinate aqueous dysprosium chloride, holmium, and yttrium solution from the third step acid extraction section enters the TbDy / DyHoY from the 45th stage as a detergent. DyHoY fully loaded fractional distillation extraction system. The TbDy feed liquid is obtained from the first-stage raffinate aqueous phase of th...

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Abstract

The invention discloses a technical process for preparing 5N dysprosium through an extraction and separation method. P229 serves as an extraction agent, and 2 N5-3 N5 dysprosium chloride serves as feed fluid. The technical process includes eight steps including three separation steps and five assisting steps, wherein the three separation steps include the TbDy / DyHoY separation stage, the Tb / Dy separation stage and the Dy / HoY separation stage; and the five assisting steps include the concentration stage, the acid extraction stage, the first rare earth saponification stage, the reverse extraction stage and the second rare earth saponification stage. The Tb / Dy separation and the Dy / HoY separation are in a series connection mode. By means of the technical process, 5N-level dysprosium products with the relative purity being 99.9990%-99.9996% can be obtained, and the yield can be up to 97.03%-98.75%. The technical process has the advantages that the dysprosium products are high in purity and yield, the production scale is large, the chemical regent consumption is low, operation is easy and convenient, and the production cost is low.

Description

technical field [0001] The invention relates to a process flow for preparing 5N dysprosium by an extraction and separation method, in particular to an acidic phosphine reagent P229 as a rare earth extractant, and a dysprosium chloride solution with a relative purity of 99.5% to 99.95% as a feed solution, with a preparation purity of ≥99.999% The extraction and separation process of dysprosium products. The invention belongs to the technical field of rare earth separation in solvent extraction. Background technique [0002] Dysprosium is one of the rare earth elements with important uses, and is widely used in high-tech fields such as magnetic refrigeration materials, magnetostrictive materials, information storage materials, and rare earth battery materials. Dysprosium products with a relative purity (that is, the relative purity of rare earths, often referred to as purity) of 99.999% (abbreviated as 5N) are an important material basis for preparing high-performance dyspros...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/38C22B3/28
CPCC22B59/00C22B3/282C22B3/3842Y02P10/20
Inventor 钟学明吴少林
Owner NANCHANG HANGKONG UNIVERSITY
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