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Electrochemical purification method for molten salt

An electrochemical and molten salt technology, applied in the field of electrochemical purification of molten salt, can solve problems such as difficult to achieve impurity removal effect, harsh equipment conditions, and inability to accurately control the reaction potential of cathode and anode, so as to achieve less consumption of materials and energy , Simple and convenient operation, short process flow

Inactive Publication Date: 2017-01-04
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the harsh requirements on equipment conditions in the purification method of molten salt in the prior art, and the inability to accurately control the potential of anodic and cathodic reactions, especially in the case of high quality requirements for molten salt, it is difficult to To achieve the ideal impurity removal effect and other defects, an electrochemical purification method for molten salt is provided. The electrochemical treatment method of the present invention avoids the introduction of chemical raw materials, has a short process flow, simple and convenient operation, less material and energy consumption, and the cathode and anode Impurities can be removed by electrolysis at the same time, the purification effect is good, and it is suitable for large-scale use

Method used

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  • Electrochemical purification method for molten salt

Examples

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Effect test

Embodiment 1

[0032] Example 1: The type of molten salt to be purified is LiF-NaF-KF eutectic molten salt (FLINAK, melting point 454° C., boiling point 1570° C.), and the ratio is 46.5:11.5:42 (mol%). The system purification treatment temperature is 550°C, the main cationic impurities in the molten salt to be purified are metal ions such as iron, nickel, chromium, aluminum, etc., and the total mass percentage of impurity cations is not more than 1%.

[0033] The molten salt electrochemical purification method mainly includes the following steps:

[0034] (1) Put the molten salt to be purified in a cylindrical graphite crucible. High-density graphite material is used, and the molten salt loading is about 2 cm in liquid height when molten.

[0035] (2) The crucible and molten salt are placed in a closed molten salt electrochemical experimental device (the device was developed by the Shanghai Institute of Applied Physics, Chinese Academy of Sciences, prepared according to the method reported ...

Embodiment 2

[0044] Example 2: The type of molten salt to be purified is LiF-NaF-KF eutectic molten salt (FLINAK, melting point 454° C., boiling point 1570° C.), and the ratio is 46.5:11.5:42 (mol%). The purification treatment temperature of the system is about 550°C. The main cationic impurities in the molten salt to be purified are iron, nickel, chromium, aluminum and other metal ions, and the main anionic impurities are oxygen ions. Wherein, the total mass percentage of cationic impurities is not more than 2%, and the total mass percentage of anionic impurities is not more than 1%.

[0045] The molten salt electrochemical purification method mainly includes the following steps:

[0046] (1) Put the molten salt to be purified in a cylindrical graphite crucible. High-density graphite material is used, and the molten salt loading is about 2 cm in liquid height when molten.

[0047] (2) The crucible and molten salt are placed in a closed molten salt electrochemical experimental device (th...

Embodiment 3

[0059] Example 3: The type of molten salt to be purified is LiCl-KCl eutectic molten salt (melting point 355° C.), and the proportion is 59:41 (mol%). The purification treatment temperature of the system is about 450°C. The main cation impurities in the molten salt to be purified are metal ions such as iron, nickel, chromium, aluminum, etc., and the total mass percentage of impurity cations does not exceed 3%.

[0060] The molten salt electrochemical purification method mainly includes the following steps:

[0061] (1) Put the molten salt in a cylindrical corundum crucible. The loading amount of molten salt is about 2 cm of liquid height when molten.

[0062] (2) The crucible and molten salt are placed in a closed molten salt electrochemical experimental device (the device was developed by the Shanghai Institute of Applied Physics, Chinese Academy of Sciences, prepared according to the method reported in the Chinese patent application number: 201320023881.X), and the external...

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Abstract

The invention discloses an electrochemical purification method for molten salt. The electrochemical purification method for the molten salt comprises the steps that (1), three electrodes of a cathode, an anode and a reference electrode are used, and an electrochemical window of the molten salts to be purified and an electrochemical reduction spike potential of impurities in the electrochemical window of the molten salts to be purified are confirmed; graphite serves as an anode material, inert metal serves as a cathode material, and the inert metal is the metal which does not react with the molten salt to be purified; and (2), electrolysis is conducted under the voltage which is negative than the electrolytic reduction peak potential of the impurities determined in the step (1) and larger than or equal to the electrochemical window of the molten salt to be purified. The method is not only suitable for a chloride molten salt system but also suitable for a fluoride salt dissolving salt system, metal cationic impurities and oxygen-containing anion impurities in the molten salt are purified and removed at the same time through single experiment operation, it is not necessary to add other chemical reagents to the molten salt system, and secondary pollution to the molten salt in the purification process is avoided.

Description

technical field [0001] The invention relates to an electrochemical purification method of molten salt. Background technique [0002] In industrial production and scientific research, the production of many rare earth metals, the refining of high-melting point metals, as well as permeation and electroplating all require the use of various molten salts as dielectrics. Molten salts are also commonly used as conductive media or solvents in high-temperature fuel cells and atomic energy industries. [0003] During the use of molten salt medium, it is generally a high temperature and corrosive environment. The existence of trace impurities in molten salt may also affect the experimental results or production process, so the molten salt must be purified before use. The required degree of purification of the molten salt depends on the electrolyte itself and its use. A high degree of solvent purification is particularly important in the application of highly hygroscopic salts and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/00
Inventor 黄卫蒋锋田丽芳佘长锋郑海洋龙德武李晴暖
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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