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Separation method of dicyclohexanocucurbiturils-light and heavy rare earths

A dicyclohexyl six-membered melon, light and heavy rare earth technology, applied in the chemical industry, can solve the problems of difficult separation, high-purity single element, etc., and achieve the effect of simple operation and fast separation

Inactive Publication Date: 2016-09-07
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the similar electronic structure and chemical properties of rare earth elements, and they are always mixed in the form of symbiotic minerals, it is very difficult to separate them.
However, most rare earth functional materials require high-purity single elements, and separation becomes the bottleneck of their application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of separation method of symmetrical dicyclohexyl six-membered melon ring-light and heavy rare earth (to separate La 3+ and Tb 3+ as an example), including the following steps:

[0016] When 1,4-DiCyHQ[6], Ln(NO 3 ) 3 and ZnCl 2 When the molar ratio is 1:3:4, respectively weigh La(NO 3 ) 3 ·6H 2 O25.29mg (0.058 mmol), Tb(NO 3 ) 3 ·6H 2 O 26.46 mg (0.058 mmol), ZnCl 2 21.23 mg (0.156 mmol), 1,4-DiCyHQ[6] 50 mg (0.039 mmol) in the same culture flask, add 5 mL of 3M HCl, heat to 50~70°C, fully dissolve and evenly until clear. Standing at room temperature for 2-3 days, the light rare earth La precipitates out in the form of precipitation, while Tb remains in the solution. The resulting precipitate was filtered and dried, with a yield of 76-82%.

Embodiment 2

[0018] A kind of separation method of symmetrical dicyclohexyl six-membered melon ring-light and heavy rare earth (to separate La 3+ and Tb 3+ as an example), including the following steps:

[0019] When 1,4-DiCyHQ[6], Ln(NO 3 ) 3 and ZnCl 2 When the molar ratio is 1:4:3, weigh La(NO 3 ) 3 ·6H 2 O33.72 mg (0.078 mmol), Tb(NO 3 ) 3 ·6H 2 O 35.28 mg (0.078 mmol), ZnCl 2 15. Add 92 mg (0.117 mmol), 50 mg (0.039 mmol) of 1,4-DiCyHQ[6] to the same culture flask, add 5 mL of 3M HCl, and heat to 50~70°C to dissolve fully and evenly until clear. Standing at room temperature for 2-3 days, the light rare earth La precipitates out in the form of precipitation, while Tb remains in the solution. The resulting precipitate was filtered and dried, with a yield of 85-90%.

Embodiment 3

[0021] A kind of separation method of symmetrical dicyclohexyl six-membered melon ring-light and heavy rare earth (to separate La 3+ and Tb 3+ as an example), including the following steps:

[0022] When 1,4-DiCyHQ[6], Ln(NO 3 ) 3 and ZnCl 2 When the molar ratio is 1:5:2, respectively, weigh La(NO 3 ) 3 ·6H 2 O42.15 mg (0.097 mmol), Tb(NO 3 ) 3 ·6H 2 O 44.11 mg (0.097 mmol), ZnCl 2 10. Add 62 mg (0.078 mmol), 50 mg (0.039 mmol) of 1,4-DiCyHQ[6] to the same culture flask, add 5 mL of 3M HCl, and heat to 50~70°C to fully dissolve and become clear. Standing at room temperature for 2-3 days, the light rare earth La precipitates out in the form of precipitation, while Tb remains in the solution. The resulting precipitate was filtered and dried, with a yield of 75-80%.

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PUM

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Abstract

The invention discloses a separation method of dicyclohexanocucurbiturils-light and heavy rare earths. The separation method comprises the following steps: weighing dicyclohexanocucurbiturils (1,4-DiCyHQ[6]), a rare earth metal salt (Ln(NO3)3) and zinc chloride (ZnCl2) respectively according to a mole ratio of 1:(3-5):(2-4), and performing mixing in a same container; adding 3MHCl into the mixture, and performing heating and stirring under the condition that the temperature is 50-70 DEG C until the mixture is completely dissolved to obtain a settled solution; performing standing at normal temperature for 2-3 days to separate out light rare earths including La, Ce, Pr, Nd, and Sm in the form of deposits and leaving Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu in the solution; and performing filtration to separate La, Ce, Pr, Nd, and Sm from other rare earths. The separation method disclosed by the invention can be used for separating out the light rare earth Sm on the basis of separating out the light rare earths La, Ce, Pr, and Nd in the prior art, and is simple to operate and quick in separation.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a method for separating symmetrical dicyclohexyl six-membered melon rings-light and heavy rare earths. Background technique [0002] As a non-renewable resource with multiple important uses, rare earths have extremely important strategic significance and are widely used in various fields of national economy and national defense construction. Since the rare earth elements have a special electronic configuration in which the outer electron structure is basically the same, and the inner 4f electron energy level is similar, so they have unique properties in terms of optoelectronics and electromagnetics, and are known as a treasure house of new materials. Through the interaction between rare earth ions and ligands, these properties can be changed, modified and enhanced to a large extent, so the research on complex chemistry provides a broad field for the design of...

Claims

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Application Information

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IPC IPC(8): C07F5/00C22B59/00
CPCC07F5/00C07F5/003C22B59/00
Inventor 张超张云黔薛赛凤祝黔江陶朱
Owner GUIZHOU UNIV
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