Large combined rare earth molten salt electrolyzer system

Abstract

The invention relates to a large combined rare earth fused salt electrolytic bath system which comprises a large combined graphite cell, graphite anodes, tungsten cathodes, a steel protective shell, a metal receiver, a cover plate of a water-cooling furnace and an electrolytic power supplies. The system is characterized in that the large combined graphite cell is the cell which is connected by blocks in tenon-and-mortise connection and combination, wherein two ends of the cell are arc surfaces. The metal receiver is arranged at the bottom of the large combined graphite cell. The metal receiver inclines at 5-10 degrees with the horizontal direction. Each tungsten cathode is connected with the cathode of an independent electrolytic power supply, the anode of each electrolytic power supply is connected with the cover plate of the water-cooling furnace, and each graphite anode is connected with the cover plate of the water-cooling furnace. The system has the advantages that the cell is compact in structure, reasonable in arrangement of cathodes and graphite anodes, low electric energy consumption, high current efficiency, good environmental benefit, reasonable wiring structure, low production cost and convenience in maintenance.

Description

technical field [0001] The invention relates to a large-scale combined rare earth molten salt electrolytic cell system for producing rare earth metals and alloys by molten salt electrolysis, and belongs to the technical field of molten salt electrolysis. Background technique [0002] my country's rare earth molten salt electrolysis industry originated in the 1980s. With the continuous development of science and technology, 4000-6000A rare earth electrolytic cells often have the problems of unstable electrolysis process parameters, low production capacity, poor product uniformity and stability, and it is difficult to achieve large-scale production. Require. With the innovation of the rare earth industry, high efficiency, energy saving, and large-scale molds are the development direction of rare earth molten salt electrolytic cells. Patents such as CN98104785.8, CN02240881.9, CN200820138112.3, CN200952043Y, and CN10184541A have all carried out large-scale rare earth electrolyti...

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Problems solved by technology

[0003]1. Patent CN85100748A, an integral graphite crucible made of graphite electrodes. Limited by the size of the graphite material, the tank body is small, generally 3000-6000A, and the product quality and stability are poor

[0004] 2. Patent CN2372329Y, the graphite tank is lined with graphite block masonry, and there is a carbon knot layer and a refractory insulation layer on the outside. This structure is not affected by the size of the graphite material. The single tank capacity can reach 10KA and the anode is changed to a split flake graphite tank and placed around the cathode, the carbon content in the product is reduced, but this kind of graphite tank masonry is more cumbersome, and molten salt leakage is prone to occur , it is not easy to realize industrial production application

[0005]3. Patent CN2464744Y, a multi-cathode and multi-anode electrolytic cell, the inner wall of the masonry cell is continuously surrounded by multiple anode plates, and multiple cathodes are arranged at intervals in the longitudinal direction of the graphite tank On the axis, the capacity of a single tank is up to 10KA, but also the patented graphite tank masonry is relatively cumbersome, and molten salt leakage is very easy to occur, and it is difficult to realize industrial production and application

[0006] 4. Patent CN232099Y, a circular Wanan electrolytic cell. The patented electrolytic cell increases the effective volume, but multiple sets of cathodes and anodes are placed at the furnace mouth at the same time. Small operating space

However, the anode of this type of electrolytic cell is cylindrical and immersed in the electrolytic solution, making it difficult to replace

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