4000A-electrolytic furnace for producing oxide molten salt through electrolysis

Abstract

The invention relates to a 4000A-electrolytic furnace for producing an oxide molten salt through electrolysis, which comprises a negative electrode, a positive electrode, a molten salt, a crucible, a graphite cuvette, a steel jacket and the like. A packing layer is filled between the graphite cuvette and the steel jacket, a throat opening on a furnace panel is quadrate, and a heat radiator is arranged above the furnace panel to play a role in balancing and stabilizing the furnace temperature. The electrolytic furnace has simple and convenient furnace building process steps and a simple furnace building method, the furnace building materials are few in variety, and part of the materials is low in price and is practical. When the furnace life becomes due, only an inner liner of the graphitecuvette is required to be replaced, and the other parts of the furnace body can be used in a long term. The electrolysis temperature is easy to control, the product quality is high, the electrolysis current can reach 4000A, the product yield is high, and the production operations are easy. The product carbon contents are very easy to control, and produced rare earth products have different electrolysis temperatures due to different varieties so that the carbon contents can be different, but the same point is that all the carbon contents can reach less than 0.03, and the carbon contents of theproducts of most varieties can reach about 0.01.

Description

Technical field [0001] The invention relates to an electrolytic furnace for producing rare earth metals and their alloys, in particular to a 4000A electrolytic furnace for the electrolytic production of oxide molten salts. Background technique [0002] At present, electrolytic furnaces for producing rare earth metals and their alloys by oxide molten salt electrolysis method have electrolytic furnaces with 4000A, 6000A, 10000A, 25000A and 30000A currents in terms of scale. Regardless of the size of the electrolytic furnace, there are no more than two methods for its furnace structure. One is graphite crucible made of graphite electrode, and the outside is wrapped with graphite powder layer, steel sleeve and insulation layer layer by layer. Most 4000A furnaces adopt this method. The second is to build with graphite plates, and the lower part of the furnace body is knotted with carbonaceous or carbonaceous mixture to prevent leakage. The upper part of the furnace body is knot...

AI Technical Summary

Problems solved by technology

[0003] The first furnace building method is relatively simple and low in cost, but the furnace life is too short, generally only three or four months, resulting in high production costs

The more important disadvantage is that the furnace temperature is too high, the product quality fluctuates with the level of workers' production and operation, and the carbon content is high

On the other hand, due to the high temperature of the furnace, the electrolytic current cannot be turned on. The current of the 4000A electrolytic furnace can only reach about 3000A, so the output is low

Compared with the first furnace construction method, the second furnace construction method has greatly improved the furnace service life, but the method is complicated and the furnace construction materials used are expensive and expensive. At the same time, the furnace body heat balance is not good, the furnace temperature is too high, carbon and The high content of other non-rare earth impurities affects the further improvement of product quality. In order to maintain the electrolysis temperature in the optimal range, the electrolysis current often cannot reach the rated current of the electrolysis furnace itself.

The electrolytic furnaces manufactured by these two furnace building methods have a common deficiency, that is, the heat balance of the furnace body is not good, and it is difficult to control the furnace temperature during production, so it is difficult to greatly increase the carbon content of the product.

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