Technological process for preparing 5N ytterbium by using solvent extraction method

A technology of process flow and extraction method, applied in the field of rare earth separation in solvent extraction, to achieve the effects of high ytterbium product yield, low production cost and optimized separation section

Inactive Publication Date: 2016-09-21
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It is not difficult to see that there has been no report on the direct preparation of 5N grade high-purity ytterbium products by solvent extraction.

Method used

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  • Technological process for preparing 5N ytterbium by using solvent extraction method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) YErTmYb / YbLu separation section

[0040] The first step is the YErTmYb / YbLu full-load fractionation extraction separation section to realize the separation of YErTmYb / YbLu. The C272 rare earth saponified organic phase with a saponification rate of 0.30 from the fourth step enters from the first stage of the YErTmYb / YbLu full-load fractionation extraction system, with a pH value of 4, a rare earth concentration of 0.80mol / L, and a ratio between the molar concentration of ytterbium and the molar concentration of rare earth. The ytterbium chloride feed liquid with a ratio of 0.995 enters from the 38th stage of the YErTmYb / YbLu full-load fractionation extraction system, and the raffinate aqueous phase ytterbium lutetium chloride solution from the third step acid extraction section enters the YErTmYb / YbLu from the 47th stage as a detergent Fully loaded fractional distillation extraction system. The YErTmYb feed liquid is obtained from the first-stage raffinate aqueous ph...

Embodiment 2

[0061] 1) YErTmYb / YbLu separation section

[0062] The first step is the YErTmYb / YbLu full-load fractionation extraction separation section to realize the separation of YErTmYb / YbLu. The C272 rare earth saponified organic phase with a saponification rate of 0.30 from the fourth step enters from the first stage of the YErTmYb / YbLu full-load fractionation extraction system, with a pH value of 5, a rare earth concentration of 0.6mol / L, and a ratio between the molar concentration of ytterbium and the molar concentration of rare earth. The ytterbium chloride feed solution with a ratio of 0.999 enters from the 29th stage of the YErTmYb / YbLu full-load fractionation extraction system, and the raffinate aqueous phase ytterbium lutetium chloride solution from the third step acid extraction section enters the YErTmYb / YbLu from the 37th stage as a detergent Fully loaded fractional distillation extraction system. The YErTmYb feed liquid is obtained from the first-stage raffinate aqueous p...

Embodiment 3

[0083] 1) YErTmYb / YbLu separation section

[0084] The first step is the YErTmYb / YbLu full-load fractionation extraction separation section to realize the separation of YErTmYb / YbLu. The C272 rare earth saponified organic phase with a saponification rate of 0.30 from the fourth step enters from the first stage of the YErTmYb / YbLu full-load fractionation extraction system, with a pH value of 3, a rare earth concentration of 1.0mol / L, and a ratio between the molar concentration of ytterbium and the molar concentration of rare earth. The ytterbium chloride feed solution with a ratio of 0.99 enters from the 39th stage of the YErTmYb / YbLu full-load fractionation extraction system, and the raffinate aqueous phase ytterbium lutetium chloride solution from the third step acid extraction section enters the YErTmYb / YbLu from the 49th stage as a detergent Fully loaded fractional distillation extraction system. The YErTmYb feed liquid is obtained from the first-stage raffinate aqueous ph...

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Abstract

The invention discloses a technological process for preparing 5N ytterbium by using a solvent extraction method. 2N-3N-grade ytterbium chloride is used as a feed liquid, an acidic phosphonium reagent C272 is used as an extracting agent, and TBP is used as an extracted organic phase additive. The technological process comprises 12 steps including 3 separation steps and 5 auxiliary steps, wherein the 3 separation steps are respectively a YErTmYb / YbLu separation section, a YErTm / Yb separation section and a Yb / Lu separation section; and the 5 auxiliary steps are respectively a concentration section, an acid extraction section, a saponification section I, a reverse extraction section and a saponification section II. The YErTm / Yb separation section is connected in series with the Yb / Lu separation section. By using the technological process, 5N-grade high-purity ytterbium products with the relative purity of 99.9990%-99.9995% can be obtained, and the yield of the 5N-grade high-purity ytterbium products can reach up to 93.99%-98.17%. The technological process has the advantages of high ytterbium product purity, high ytterbium product yield, large production scale, low chemical reagent consumption, simplicity and convenience in operation, low production cost and the like.

Description

technical field [0001] The invention relates to a process flow for preparing 5N ytterbium by a solvent extraction method, in particular to di(2,4,4-trimethylpentyl)phosphonic acid (C272 or Cyanex272) as an extractant, an extraction and separation process for preparing ytterbium products with a purity of ≥99.999%. The invention belongs to the technical field of rare earth separation in solvent extraction. Background technique [0002] Ytterbium is widely used in high-tech fields such as fluorescent materials, magnetic bubble materials, laser materials, and optical glass materials. The purity of ytterbium products is one of the key factors affecting the performance and function of related ytterbium materials, so improving the purity of ytterbium products has important practical significance. Ytterbium 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 pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/38
CPCC22B59/00C22B3/3846Y02P10/20
Inventor 钟学明
Owner NANCHANG HANGKONG UNIVERSITY
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