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Molten salt, electrochemical purification method of molten salt and electrochemical device

An electrochemical and molten salt technology, applied in chemical instruments and methods, fluoride preparation, chloride preparation, etc., can solve the problems of low efficiency of molten salt removal and purification, and achieve environmental protection reduction, emission reduction, and high deoxidation level. Effect

Active Publication Date: 2021-11-05
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

[0008] The technical problem to be solved by the present invention is to overcome the defects of low purification efficiency of molten salt removal (such as oxygen, sulfur, iron, nickel and other impurities) by electrochemical methods in the prior art, and provide a molten salt and an electrochemical method for molten salt Chemical purification method, electrochemical device

Method used

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  • Molten salt, electrochemical purification method of molten salt and electrochemical device
  • Molten salt, electrochemical purification method of molten salt and electrochemical device
  • Molten salt, electrochemical purification method of molten salt and electrochemical device

Examples

Experimental program
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Effect test

Embodiment 1

[0121] High purity MgCl 2 - Preparation and purification of NaCl-KCl.

[0122] Weigh 275g MgCl respectively 2 , 123g NaCl, and 102g KCl were mixed evenly, placed in a nickel crucible with an inner diameter of 80mm and a height of 120mm, and heated to 600°C under an argon atmosphere to melt for later use. use image 3 The experimental setup shown was used for electrochemical tests and electrolytic purification experiments. Among them, the Ni-MH electrode is welded with a nickel tube with an outer diameter of 6mm and an inner diameter of 3.5mm and a nickel mesh with a mesh size of 1mm×2mm (such as figure 1 shown), the total surface area of ​​the nickel tube and the nickel mesh immersed in the molten salt is about 12.5cm 2 . The purity of all nickel materials (including nickel crucible, nickel tube, nickel mesh) is ≥99.5%. Hydrogen purity ≥99.99%. In the electrochemical test, the working electrode (WE) is a nickel hydrogen electrode, the counter electrode (CE) is a nickel ...

Embodiment 2

[0141] Preparation and purification of high-purity LiF-NaF-KF.

[0142] Weigh 146.5g LiF, 58.5g NaF, and 295.0g KF, mix them evenly, place them in a nickel crucible with an inner diameter of 80mm and a height of 120mm, and heat up to 650°C under an argon atmosphere to melt for later use. use figure 2 The experimental setup shown is for electrolytic purification experiments. Among them, the Ni-MH electrode is welded by a nickel tube with an outer diameter of 6mm and an inner diameter of 3.5mm and a nickel mesh with a mesh size of 1mm×2mm. The total surface area of ​​the nickel tube and nickel mesh immersed in molten salt is about 16.2cm 2 . The purity of all nickel materials (including nickel crucible, nickel tube, nickel mesh) is ≥99.5%. Hydrogen purity ≥99.99%. The Ni-MH electrode flow is constant at 200mL / min, and the electrolysis mode is a constant current of 15mA. Purify by electrolysis of 2 hours, the oxygen content in the molten salt before and after sampling analy...

Embodiment 3

[0161] High-purity LiF-BeF 2 -ZrF 4 preparation and purification.

[0162] High-purity LiF-BeF 2 -ZrF 4 preparation and purification. Weigh 214.7g LiF and 179.1g BeF respectively 2 , 106.2gZrF 4 After mixing evenly, place it in a nickel crucible with an inner diameter of 80mm and a height of 120mm, and heat it up to 600°C under an argon atmosphere to melt it for later use. use figure 2 The experimental setup shown is for electrolytic purification experiments. Among them, the Ni-MH electrode is welded by a nickel tube with an outer diameter of 6mm and an inner diameter of 3.5mm and a nickel mesh with a mesh size of 1mm×2mm. The total surface area of ​​the nickel tube and nickel mesh immersed in molten salt is about 18.5cm 2 . The purity of all nickel materials (including nickel crucible, nickel tube, nickel mesh) is ≥99.9%. Hydrogen purity ≥ 99.995%. The Ni-MH electrode flow rate is constant at 200mL / min, and the electrolysis mode is constant voltage 1.1V. Purify b...

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Abstract

The invention discloses molten salt, an electrochemical purification method of the molten salt and an electrochemical device. The electrochemical purification method of the molten salt comprises the step that: in the molten salt in a molten state, with a hydrogen electrode taken as an anode, and H2 is electrolyzed into H < + > on the surface of the hydrogen electrode, in the anode, an electrode reaction described in the specifications is carried out, in the molten salt, the oxygen content is less than or equal to 230ppm, the sulfur content is less than or equal to 5ppm, and the transition metal element content is less than or equal to 8ppm, and the oxygen content can be less than or equal to 80ppm. According to the method, the molten salt is purified by adopting a process based on a hydrogen electrode electrolysis method, the purification purposes of deoxidation, desulfurization, removal of transition metal ions (such as iron and nickel) and the like can be achieved by only adopting H2 instead of using highly toxic HF or highly corrosive HCl, and the deoxidation purification efficiency and the deoxidation purification level of the method are comprehensively superior to those of a traditional HF / HCl-H2 method and an electrochemical method.

Description

technical field [0001] The invention relates to a molten salt, a purification method and an electrochemical device for the molten salt. Background technique [0002] Molten salt composed of alkali metal, alkaline earth metal fluoride or chloride is the heat transfer or heat storage working fluid of new energy systems such as molten salt reactor (MSR) and concentrated solar energy storage system (CSP). This kind of molten salt working medium has the advantages of wide liquid working temperature range, low vapor pressure, high thermal conductivity and specific heat capacity, etc. The main disadvantages are that it is easy to absorb moisture and difficult to deoxidize. For example, in the molten salt stack fluoride salt coolant system, the HF generated by the hydrolysis of trace water has a corrosive effect on structural metals, while O 2- then it is possible to make liquid UF 4 Nuclear fuel forms UO 2 Precipitation, which in turn affects the safe operation of molten salt re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B9/08C01B9/02C09K5/12
CPCC01B9/08C01B9/02C09K5/12C01P2006/80
Inventor 左勇宋昱龙汤睿钱渊王建强
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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