Graphite anode and replacing method thereof

Abstract

The invention discloses a graphite anode. The whole graphite anode is in a hollow cylinder structure, and comprises multiple anode pieces, wherein the multiple anode pieces are connected in parallel; the top surface of each anode piece is provided with at least two thread holes; an anode guide plate is connected between two adjacent anode pieces; each anode guide plate is arranged above a graphite electrolytic cell and bridges over two adjacent anode pieces; each anode guide plate is a metal guide plate with the same inner diameter and outer diameter as the graphite anode piece, and the metal guide plate is connected with a power supply positive pole; the metal guide plate is also provided with at least two inner thread holes which are aligned with the inner thread holes on the two adjacent graphite anode pieces in a one-to-one mode; and the inner thread holes on the metal guide plate are connected with the inner thread holes on the corresponding anode piece through bolts. The graphite anode disclosed by the invention is easy to replace, has slight influences on fused salt surface fluctuation in an electrolytic furnace, furnace temperature fluctuation and temperature difference change, prevents shutdown of the furnace, and improves the service life of the electrolytic furnace.

Description

Technical field [0001] The invention relates to a graphite anode and a replacement method thereof. In particular, the graphite anode is used in the production of rare earth metals and alloys by the rare earth oxide-fluoride molten salt electrolysis method, especially in a circular electrolytic cell. Background technique [0002] Since the graphite anode used in the rare earth oxide-fluoride molten salt electrolysis system is a consumable anode, it needs to be replaced regularly during the production process. [0003] Production practice has found that the hollow cylindrical graphite anode has the following defects: inconvenient operation, because the graphite anode is a whole, it is bulky and difficult to lift during replacement; before and after the anode is replaced, the molten salt level in the electrolytic furnace fluctuates greatly; anode replacement Before and after, the furnace temperature fluctuates greatly. [0004] Because the new graphite anode cylinder is cold, it is eas...

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Problems solved by technology

[0003] Production practice has found that the use of hollow cylindrical graphite anode has the following defects: inconvenient operation, because the graphite anode is a whole, heavy, difficult to lift when replacing; before and after the anode replacement, the molten salt liquid level in the electrolytic furnace fluctuates greatly; Before and after, the furnace temperature fluctuates greatly

[0004] Since the replaced new graphite anode cylinder is in a cold state, it is prone to dead furnace phenomenon caused by the sudden drop of furnace temperature after the new anode is put down, which not only seriously affects the electrolysis production, but also easily causes molten salt to condense on the inner wall of the furnace, causing becomes smaller, which affects the service life of the electrolytic furnace

Secondly, when replacing a new anode cylinder, the power must be cut off, and the temperature of the furnace will drop too quickly. After the replacement, the temperature must be raised again. Only when the furnace temperature rises to the normal temperature can the electrolysis start, which will affect the output and affect the product quality.

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