Preparation method of rare earth metal

A technology of rare earth metals and rare earth salts, applied in the field of rare earths, can solve the problems of high price, high energy consumption, and high cost of rare earth metals, and achieve the effects of reducing outgassing, saving energy consumption, and reducing emissions

Active Publication Date: 2019-05-31
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of ionic liquid is expensive, and the deposition process must be carried out at 150 ° C
[0009] In summary, the existing methods for preparing rare earth metals by using ionic liquids have the disadvantages of high cost, high energy consumption, cumbersome operation due to the use of solid additives, and the need to operate in a glove box, which limits its industrial application

Method used

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  • Preparation method of rare earth metal
  • Preparation method of rare earth metal
  • Preparation method of rare earth metal

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preparation example Construction

[0030] It can be seen from the background technology that the existing methods for preparing rare earth metals using ionic liquids have disadvantages such as high cost, high energy consumption, cumbersome operation due to the use of solid additives, and the need to operate in a glove box, which limits its industrial application. The inventors of the present invention have conducted research on the above problems and provided a method for preparing rare earth metals. The preparation method includes the following steps: mixing rare earth salts, ionic liquids, and hydroxyl ether solvents to form an electrolyte, and placing the electrolyte in In the electrolytic cell; the electrolytic solution is electrolyzed to form rare earth metals; wherein, the structural formula of the hydroxy ether solvent is:

[0031]

[0032] Among them, R 1 is any of hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl; R 2 Any one of methyl, ethyl, n-propyl, isopropyl, n-but...

Embodiment 1

[0045] This embodiment provides a method for preparing rare earth metals, comprising the following steps:

[0046] First, the LaCl 3 , ionic liquid and 2-hydroxypropyl methyl ether are mixed to form an electrolyte, and the electrolyte is placed in an electrolytic cell, wherein the volume ratio of the ionic liquid to 2-hydroxypropyl methyl ether is 10:1, and the rare earth salt The content in the electrolyte is 5g / L, and the anion of the ionic liquid is BF 4 - , the cation of the ionic liquid is 1-ethyl-3-methylimidazolium cation;

[0047] Then, the serpentine tube feeds nitrogen gas into the electrolytic cell to aerodynamically stir the electrolyte, and pre-electrolyze the electrolyte, wherein the current density is preferably 10A / m 2 , the time of pre-electrolysis is preferably 10min.

[0048] Finally, with the inert electrode as the working electrode and the inert electrode as the counter electrode, the electrolyte is electrolyzed by constant current electrodeposition, a...

Embodiment 2

[0050] This embodiment provides a method for preparing rare earth metals, comprising the following steps:

[0051] First, the LaCl 3 , ionic liquid and 2-hydroxypropyl ethyl ether are mixed to form an electrolyte, and the electrolyte is placed in an electrolytic cell, wherein the volume ratio of the ionic liquid to 2-hydroxypropyl ethyl ether is 5:1, and the rare earth salt The content in the electrolyte is 15g / L, and the anion of the ionic liquid is BF 4 - , the cation of the ionic liquid is 1-ethyl-3-methylimidazolium cation;

[0052] Then, the serpentine tube feeds nitrogen gas into the electrolytic cell to aerodynamically stir the electrolyte, and pre-electrolyze the electrolyte, wherein the current density is preferably 10A / m 2 , the time of pre-electrolysis is preferably 20min.

[0053] Finally, with the inert electrode as the working electrode and the inert electrode as the counter electrode, the electrolyte is electrolyzed by constant current electrodeposition, and...

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Abstract

The invention provides a preparation method of rare earth metal. The preparation method comprises the following steps: rare earth salt, ion liquid and hydroxyl ether solvent are mixed to form electrolyte, and the electrolyte is put in an electrolytic bath; the electrolyte is electrolyzed to form the rare earth metal; and the formula of the hydroxyl ether solvent is FORMULA, wherein R1 is any one of hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tertiary butyl, R2 is any one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tertiary butyl, and n is 1-10. The method uses the hydroxyl ether solvent as additive, and uses hydroxyl hydrotropy rare earth salt, and the hydroxyl hydrotropy rare earth salt only contains one hydroxyl, so that the gas release quantity is largely reduced, the current is not quickly reduced, and the porosity in products is also largely reduced. The method uses a solid substance as additive to relieve the problems of difficult dissolving and complex steps.

Description

technical field [0001] The invention relates to the technical field of rare earths, in particular to a method for preparing rare earth metals. Background technique [0002] The traditional preparation methods of rare earth metals mainly include vacuum thermal reduction method and molten salt electrolysis method. These preparation methods have the characteristics of high energy consumption, serious pollution, strong corrosion and high requirements for equipment and related configurations, which limit their application in the field of preparation of rare earth metals. Applications. [0003] Ionic liquids are widely used as electrolytes in electrochemical processes due to their excellent properties such as low melting point, low volatility and stable electrochemical properties. At present, the method of depositing rare earth metals by ionic liquids has been extensively studied at home and abroad. Domestically, for example, the Chinese patent application number ZL201110435737....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/22
CPCY02P10/20
Inventor 苗睿瑛张小伟闫缓王志强陈德宏朱琼周林吴道高张虎颜世宏李宗安
Owner GRIREM ADVANCED MATERIALS CO LTD
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