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A kind of preparation method of inert anode suitable for high temperature molten salt system

A technology of inert anode and high-temperature molten salt, which is applied in the field of electrochemistry, can solve the problems of high price, and achieve the effect of low price, strong oxidation resistance and good corrosion resistance

Active Publication Date: 2021-07-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the reported inert anodes that can be used in molten oxide systems are noble metals such as Ir, but they are expensive
Therefore, it is extremely urgent to develop an inert anode suitable for extremely high temperature molten oxide systems, but it is also a great challenge

Method used

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  • A kind of preparation method of inert anode suitable for high temperature molten salt system
  • A kind of preparation method of inert anode suitable for high temperature molten salt system
  • A kind of preparation method of inert anode suitable for high temperature molten salt system

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Experimental program
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Effect test

Embodiment 1

[0023] The sintered titanium diboride is processed into the required size by wire cutting, cleaned and connected to the conductive rod as an inert anode, and the quartz plate is used as the cathode. 2 - In CaO (2wt%) molten salt electrolyte, 3.0V constant voltage electrolysis was implemented. After 10 hours of electrolysis, the anode released oxygen during the electrolysis process and showed good and stable electrical conductivity, and the cathode was prepared to obtain silicon. After the electrolysis, there is no change in the appearance size of the anode.

Embodiment 2

[0025] The sintered titanium diboride is processed into the required size by wire cutting, cleaned and connected to the conductive rod as an inert anode, and the quartz plate is used as the cathode. 2 - In CaO (5wt%) molten salt electrolyte, 2.6V constant voltage electrolysis was implemented. After 30 hours of electrolysis, the anode released oxygen during the electrolysis process and showed good and stable electrical conductivity, and the cathode was prepared to obtain silicon. After electrolysis, the appearance size of the anode hardly changes, and the thickness of the surface oxide film is about 20um.

Embodiment 3

[0027] The sintered titanium diboride is processed into the required size by wire cutting, cleaned and connected to the conductive rod as an inert anode, and the quartz plate is used as the cathode. 2 - In CaO (3wt%) molten salt electrolyte, 2.8V constant voltage electrolysis was implemented. After up to 100 hours of electrolysis, the anode released oxygen during the electrolysis process and showed good and stable electrical conductivity, and the cathode was prepared to obtain silicon. After the electrolysis, the appearance size of the anode hardly changes, the thickness of the oxide layer is about 200um, and the corrosion rate is calculated to be 1.38×10 -3 g cm -2 h -1 , showing excellent corrosion resistance.

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Abstract

The invention relates to a method for preparing an inert anode suitable for a high-temperature molten salt system, belonging to the molten salt electrolysis industry. The details are as follows: The inert anode is composed of a substrate and an oxide layer. The substrate material is titanium diboride. The oxide layer can be formed by the in-situ reaction of the surface of the titanium diboride substrate with oxygen and electrolyte during the electrolytic process, or it can be formed at 800-1200°C Temperature, calcination in air atmosphere for 0.5-2 hours pre-oxidation, this stable oxide layer can prevent the chemical-electrochemical corrosion of titanium diboride base materials, while always having good electrical conductivity; the inert anode is suitable for 400-1000 Alkali / alkaline earth metal chloride molten salt system at ℃ and CaO‑Al at 1200‑1600 °C 2 o 3 ‑SiO2 2 based molten oxide systems. The inert anode has low chemical and electrochemical dissolution, strong oxidation resistance, good corrosion resistance, excellent conductivity, and can avoid the consumption of carbon anode and CO 2 Gas emission, continuous production, energy saving and other advantages.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an inert anode suitable for a high-temperature molten salt system and suitable for the molten salt electrolysis industry. Background technique [0002] The preparation of metals and alloys by molten salt electrolysis is a metallurgical method with short process and low energy consumption. At the beginning of the 19th century, Davy in the UK was the first to use molten salt electrolysis to prepare alkali / alkaline earth metals from various alkali / alkaline earth metal hydroxide molten salts, thus opening up the era of molten salt electrochemical technology. With the rapid development of molten salt electrochemistry, by the end of the 19th century, molten salt electrolysis of aluminum, magnesium and other light metals had been industrialized. Later, the molten salt electrolysis technology was applied to the research and application of rare earths and refractory ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02C25C3/02
CPCC25C3/02C25C7/025
Inventor 焦树强杜洋王明涌涂继国寇明银
Owner UNIV OF SCI & TECH BEIJING