Method for reducing carbon pollution in molten salt electrolysis process

A molten salt electrolysis and carbon pollution technology, applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of shortening the life of the anode, increasing the content of carbon impurities, and reducing the current efficiency, so as to improve the pollution of molten salt and reduce the product Carbon content, the effect of avoiding the risk of short circuit

Pending Publication Date: 2021-06-18
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the parasitic reaction of carbon seriously increases the extra power consumption and reduces the current efficiency
(2) shortened anode life
Due to the cyclical nature of carbon parasitic reactions, graphite anodes are more severely eroded by ions and air bubbles, which increases anode loss and shortens anode life.
(3) Molten salt pollution and short circuit risk
In addition, because the carbon powder is relatively light, a large amount of carbon powder floats on the surface of the molten salt. As the electrolysis process progresses, more and more carbon powder accumulates on the surface of the molten salt. In severe cases, the cathode and anode will be connec

Method used

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  • Method for reducing carbon pollution in molten salt electrolysis process
  • Method for reducing carbon pollution in molten salt electrolysis process
  • Method for reducing carbon pollution in molten salt electrolysis process

Examples

Experimental program
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Embodiment 1

[0031] This embodiment selects CaCl 2 -30wt% KCl is molten salt, and a graphite rod with a diameter of 10mm is used as the anode, indicating that the molten salt modification has an inhibitory effect on carbon pollution. The steps are as follows:

[0032] 1) Weigh 1.5g TiO 2 The powder was wrapped with a 300-mesh stainless steel mesh as the cathode.

[0033] 2) Add CaCl 2 Mix with KCl molten salt at a mass ratio of 7:3 and dry at 150°C for 12 hours;

[0034] 3) TiO wrapped with stainless steel mesh 2 The powder is suspended on a steel electrode rod with a metal wire as the cathode, and a graphite rod with a diameter of 10 mm as the anode, CaCl 2 -30 wt.% KCl mixed molten salt as molten salt;

[0035] 4) The electrolysis is carried out in the tubular electrolysis furnace, and the air in the furnace is exhausted by repeated vacuuming and argon gas before electrolysis. After cleaning the furnace, argon gas is continuously fed into the furnace to ensure an inert atmosphere. ...

Embodiment 2

[0041] This embodiment selects CaCl 2 -50wt% KCl is molten salt, and a graphite rod with a diameter of 10mm is used as the anode, indicating that the molten salt modification has an inhibitory effect on carbon pollution. The steps are as follows:

[0042] 1) Weigh 1.5g TiO 2 The powder was wrapped with a 300-mesh stainless steel mesh as the cathode.

[0043] 2) Add CaCl 2 Mix with KCl molten salt at a mass ratio of 1:1 and dry at 150°C for 12 hours;

[0044] 3) TiO wrapped with stainless steel mesh 2 The powder is suspended on a steel electrode rod with a metal wire as the cathode, and a graphite rod with a diameter of 10 mm as the anode, CaCl2 -30 wt.% KCl mixed molten salt as molten salt;

[0045] 4) The electrolysis is carried out in the tubular electrolysis furnace, and the air in the furnace is exhausted by repeated vacuuming and argon gas before electrolysis. After cleaning the furnace, argon gas is continuously fed into the furnace to ensure an inert atmosphere. T...

Embodiment 3

[0051] This embodiment selects CaCl 2 For the molten salt, a graphite rod with a diameter of 10mm is used as the anode, and the depth of immersion in the molten salt is 0.5mm (the area of ​​the anode is 2.36cm 2 ). To demonstrate the inhibitory effect of reducing the anode area on carbon contamination in the cathode product, the steps are as follows:

[0052] 1) Weigh 1.5g TiO 2 The powder was wrapped with a 300-mesh stainless steel mesh as the cathode.

[0053] 2) Add CaCl 2 Dry the molten salt at a temperature of 150°C for 12 hours;

[0054] 3) TiO wrapped with stainless steel mesh 2 The powder is suspended on a steel electrode rod with a metal wire as the cathode, and a graphite rod with a diameter of 10 mm as the anode, CaCl 2 as molten salt;

[0055] 4) The electrolysis is carried out in the tubular electrolysis furnace, and the air in the furnace is exhausted by repeated vacuuming and argon gas before electrolysis. After cleaning the furnace, argon gas is continu...

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Abstract

The invention discloses a method for reducing carbon pollution in a molten salt electrolysis process, and belongs to the technical field of molten salt electrolysis. According to the method, carbon pollution in the electrolysis process is reduced by adjusting molten salt components and the anode area. In the electrolysis process, oxygen ions removed by a cathode are discharged at an anode to generate CO2, CO2 is captured by O2- in molten salt to form CO3<2->, CO3<2->is discharged at the cathode to generate carbon, and carbon pollution of a cathode product and the molten salt is caused. According to the method, a certain amount of KCl is added into CaCl2 to improve the wettability between the molten salt and a graphite anode and reduce the anode area, nucleation, growth and separation rates of anode CO2 bubbles are promoted, the residence time of CO2 in the molten salt is shortened, generation of CO3<2-> ions near the anode is inhibited, and therefore the carbon pollution is weakened.

Description

technical field [0001] The invention relates to the technical field of molten salt electrochemistry, in particular to a method for reducing carbon pollution during molten salt electrolysis. Background technique [0002] The FFC Cambridge method usually uses metal oxides or mixed metal oxides as cathodes to prepare metals and their alloys, which has the advantages of simple operation, low energy consumption, and environmental friendliness. However, there is a general risk of carbon contamination in molten salts and products during electrolysis. When electrolysis is carried out in a molten salt rich in oxygen ions with carbonaceous materials as the anode, carbon pollution is unavoidable. On the one hand, the corrosion and electrochemical reaction of the carbonaceous anode in the high-temperature molten salt lead to the stripping of carbon powder, and on the other hand, the oxygen ions removed by the cathode discharge at the anode to generate CO 2 , CO 2 O in the molten salt...

Claims

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Application Information

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IPC IPC(8): C25C7/06C25C3/28C25C7/02
CPCC25C3/28C25C7/025C25C7/06
Inventor 扈玫珑张苗刘涌涛李若琰马通祥
Owner CHONGQING UNIV
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