Novel lower heating graphite crucible

Abstract

The invention provides a novel lower heating graphite crucible which comprises a graphite crucible body, and the graphite crucible body is divided into a cylindrical area, a graphite thickening area, a temperature sensing heating area and a circular-truncated-cone-shaped groove area from top to bottom. An anode strip is arranged in the cylindrical area; a metal receiver is arranged at the bottom of the inner side of the circular-truncated-cone-shaped groove area, and an annular heating coil is nested in the temperature sensing heating area; two ports of the annular heating coil protrude out of the graphite crucible; an insulating component is nested between two ports of the annular heating coil, an extension groove is formed in the center of the insulating component, and a temperature sensing piece is arranged in the extension groove; according to the scheme, the temperature sensing piece is mounted at the position corresponding to the low-temperature area at the lower part of the graphite crucible, so that the temperature of molten salt at the bottom of the crucible can be monitored in real time and fed back, and accurate data reference is provided for production operation; when the temperature of the low-temperature area is too low or slagging and lifting are conducted, the low-temperature area at the bottom of the crucible can be heated through the heating coil, and therefore the purposes of eliminating slagging and lifting, protecting the crucible and improving the metal purity are achieved.

Description

technical field [0001] The invention relates to the technical field of rare earth molten salt electrolysis equipment, in particular to a novel lower heating graphite crucible. Background technique [0002] Rare earth molten salt electrolysis is the main production process for producing rare earth metals and their alloys. The crucible (furnace) of the electrolytic cell is made of graphite material. As the key equipment of this process, its structure directly affects the quality, work efficiency and production of rare earth metals. cost. The production of rare earth metals by molten salt electrolysis mostly adopts fluoride electrolysis system. The electrolytic cell used is an open type. During electrolysis, a cathode rod is inserted in the middle of the crucible, and a graphite anode sheet is hung around the crucible, thereby forming the electrode to generate an electric field. The melting temperature is above 1000℃. After the rare earth oxide is added to the graphite crucib...

AI Technical Summary

Problems solved by technology

[0006] In summary, the current graphite electrolyzer and its components have the following problems in the process of use: (1) The temperature in the low temperature zone of the graphite crucible is difficult to grasp and control, which directly affects the operation stability; Metal droplets at the bottom, impurity slagging, and platforming are generally eliminated by manual agitation and high pressure in production, which will destroy the molten salt reaction system and cause deep damage to the crucible

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