Gas blowing protection device, method and rare earth fluorine salt electrolysis device

Abstract

The invention discloses a gas blowing protection device and method and a rare earth fluoride electrolysis device. The gas blowing protection device comprises a first gas cylinder, a second gas cylinder and a storage mechanism, wherein the first gas cylinder is used for storing first inert gas; a first gas blowing pipe communicates with the first gas cylinder to deliver the first inert gas; the second gas cylinder is used for storing second inert gas; the storage mechanism is used for storing rare earth fluoride; a second gas blowing pipe communicates with the second gas cylinder and the storage mechanism to deliver a mixture of the second inert gas and the rare earth fluoride; a preset included angle is formed between the gas blowing direction of the first gas blowing pipe and the gas blowing direction of the second gas blowing pipe. According to the gas blowing protection device and method for graphite anodes during rare earth fluoride electrolysis and a rare earth fluoride electrolysis device, an electrolytic solution and the rare earth fluoride are blown to the graphite anodes to form continuous and stable protective layers in the electrolytic process to achieve whole process protection during the use cycle so as to prolong the service life of the graphite anodes. With the absence of pretreatment on the graphite anodes, little cost is increased.

Description

technical field [0001] The invention relates to rare earth preparation technology, in particular to a gas blowing protection device, a method and a rare earth fluorine salt electrolysis device. Background technique [0002] At present, more than 95% of rare earth metals and alloys are prepared by molten salt electrolysis, and fluoride salt electrolysis is the mainstream preparation method of molten salt electrolysis. In the electrolysis of rare earth fluoride salts, graphite has become the necessary material for fluoride salt electrolysis anodes and electrolytic cells because of its excellent high temperature resistance, corrosion resistance, high electrical conductivity and good processing performance. However, graphite has the characteristics of easy oxidation and consumption, especially under high temperature conditions, the oxidation consumption rate is fast, and the service life is short, only 2 to 3 days, resulting in a significant increase in the cost of electrolytic ...

AI Technical Summary

Problems solved by technology

However, in the fluorine salt system, since the electrolysis temperature is as high as 1000°C, for the graphite anode, the heat generated by the contact voltage between the anode plate clamp and the graphite anode has a small proportion, which cannot effectively slow down the oxidation consumption of the graphite anode.

[0007] In summary, at present, in the fluorine salt system, the only feasible method to prolong the service life of graphite anode is the impregnation treatment method for graphite anode proposed by Chinese patent [CN102677100B], Chinese patent [CN103132104B] and [CN102230195A], but none of the above methods can The graphite anode is fully protected during the entire service life, and the processing procedure and manufacturing cost of the graphite anode are additionally increased, which deviates from the original intention of reducing the production cost to some extent

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