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Application of Atmospheric Pressure Hollow Plasma Electrode in Molten Salt Electrolysis

A plasma electrode, molten salt electrolysis technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of high purity of carbon rods, bad environment, high price, etc., and achieve high electrolysis current efficiency, good economic effect, and environmental protection Good results

Active Publication Date: 2019-10-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precious metal electrodes are usually expensive and have poor corrosion resistance, so the economic benefits are poor; carbon rods as anodes usually undergo oxidation reactions to generate greenhouse gas carbon dioxide, causing adverse environmental impacts, and carbon rods as inert anodes require Very high purity, expensive
On the cathode side, the electrolysis product is deposited on the metal cathode. With the gradual accumulation of the product and the existence of dendrites and other phenomena, the electrolysis efficiency will be reduced. Therefore, the electrode needs to be cleaned regularly, which is not conducive to the continuous operation of the electrolysis process.

Method used

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  • Application of Atmospheric Pressure Hollow Plasma Electrode in Molten Salt Electrolysis
  • Application of Atmospheric Pressure Hollow Plasma Electrode in Molten Salt Electrolysis
  • Application of Atmospheric Pressure Hollow Plasma Electrode in Molten Salt Electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 It is the equipment diagram of the normal pressure hollow plasma electrode of the present invention used as the cathode in the molten salt electrolysis. Such as figure 1 As shown, the device of the present invention includes a power supply part (including a DC high-voltage power supply 1 and a resistor 2), an atmospheric pressure hollow plasma gas discharge system (including a cathode 3, an anode 4, argon 8 and a platinum wire 9), and a molten salt part (including Molten salt 5, heating furnace 6 and hearth 7) and electric wire line Figure Four Parts. Among them, the anode 4 is composed of platinum wire 9, the cathode 3 is composed of a hollow metal tube, and argon gas is passed into it to form a hollow plasma gas electrode. The cathode 3 is connected to the negative electrode of the DC high voltage power supply, and the molten salt 5 is in the hollow metal tube. Immediately below, the bottom of the hollow metal tube is kept at a distance of 1-20mm from the mo...

Embodiment 2-5

[0044] The same experimental device as in Example 1 was used, in which the anode was replaced with Ag wire with a diameter of 1-10 mm, and the composition of the molten salt 5 was 0.2 mol KCl and 0.2 mol LiCl. Keep the electrolysis current 10mA unchanged, change the electrolysis time, weigh the mass reduction value of the anode Ag wire before and after electrolysis, and obtain the theoretical reduction value according to Faraday's law. The ratio of the actual value to the theoretical value is the current efficiency of electrolysis. Other conditions remain the same, and the anode mass reduction value is shown in Table 1.

Embodiment 6-9

[0046] The same experimental device as in Example 1 was used, in which the anode was replaced with Ag wire with a diameter of 1-10 mm, and the composition of the molten salt 5 was 0.2 mol KCl and 0.2 mol LiCl. Keep the electrolysis time unchanged for 1 hour, change the size of the electrolysis current, weigh the mass reduction value of the anode Ag wire before and after electrolysis, and obtain the theoretical reduction value according to Faraday's law. The ratio of the actual value to the theoretical value is the current efficiency of electrolysis. Other conditions remain the same, and the anode mass reduction value is shown in Table 1.

[0047] Table 1 Results of anode mass reduction in Examples 1-9

[0048]

[0049]

[0050] The implementation of Examples 2-9 proves that the method of the present invention can quickly form plasma between the cathode hollow metal tube and the molten salt interface after the high voltage is turned on. After the electrolysis is maintained for a pe...

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Abstract

The invention provides an application of atmospheric pressure hollow plasma electrode in molten salt electrolysis. In molten salt electrolysis, the atmospheric hollow plasma electrode can be used as anode and / or cathode. By applying the atmospheric pressure hollow plasma electrode in a molten salt electrolysis process, the metal corresponding to the molten salt can be prepared by electrolysis. Themethod has the advantages of simplicity, convenience and corrosion resistance, and high electrolysis current efficiency.

Description

Technical field [0001] The present invention relates to the technical field of molten salt electrolysis, and more specifically, to the application of a normal pressure hollow plasma electrode in molten salt electrolysis. Background technique [0002] Molten salt electrolysis is an important industrial application process for preparing metals, alloys or semiconductor materials. The traditional molten salt electrolysis process generally uses solid electrodes as the cathode or anode respectively. However, there are still certain problems in the use of solid electrodes. [0003] When preparing metal by electrolysis, the anode needs to use an inert anode to ensure its good corrosion resistance, and the cathode generally uses a metal electrode to deposit electrolytic products. Currently, inert anodes generally use precious metals or carbon rods. Precious metal electrodes are usually expensive and have poor corrosion resistance and poor economic benefits; carbon rods are used as anodes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02
Inventor 陆跃翔魏国玉刘学刚陈靖王哲
Owner TSINGHUA UNIV