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Molten salt non-electrolytic infiltration local treatment method for prolonging service life of tungsten cathode and molybdenum cathode of rare earth molten salt electrode

A treatment method, non-electrolytic technology, applied in electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of increased cost, difficult protection methods, consumption of inert cathode materials, etc., so as to prolong the service life, reduce the production cost, and the connection is not easy to fall off. Effect

Active Publication Date: 2021-10-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in practical applications, protection methods such as water cooling and iron wire winding are difficult to implement conveniently. Even if the tungsten cathode is used upside down, due to the local rapid size reduction of the tungsten cathode, its total service life will still not exceed one year, resulting in rapid consumption of the inert cathode material, resulting in Increased costs

Method used

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  • Molten salt non-electrolytic infiltration local treatment method for prolonging service life of tungsten cathode and molybdenum cathode of rare earth molten salt electrode
  • Molten salt non-electrolytic infiltration local treatment method for prolonging service life of tungsten cathode and molybdenum cathode of rare earth molten salt electrode
  • Molten salt non-electrolytic infiltration local treatment method for prolonging service life of tungsten cathode and molybdenum cathode of rare earth molten salt electrode

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Effect test

Embodiment 1

[0027] (1) Cut the sintered tungsten rod into 2×2×0.5(cm 3 ) samples, the surface was polished on both sides by 240#, 400#, 600#, 800#, 1000# metallographic water sandpaper in sequence, then ultrasonically cleaned with acetone for 15min, dehydrated with absolute ethanol, dried at 60°C, and dried The time is 6 hours, so that the surface of the sample is smooth and flat, with metallic luster, no oil stains, no rust adhesion, and no obvious oxide layer exists.

[0028] (2) Mole fractions are 33% NaCl, 33% KCl, 14% NaF, 5% Na 2 SiF 6 and 15% Si were weighed and placed in an oven, dried at 105°C for 2 hours, ground into molten salt fine powder and mixed evenly. Pour the molten salt into a 50mL alumina crucible, and then immerse the tungsten sample treated in step (1) in the mixed molten salt contained in the crucible to ensure that the surface of the sample is in full contact with the molten salt, and place the quartz The rods were placed vertically in the molten salt to stabili...

Embodiment 2

[0036] (1) With the help of electric spark cutting method in The sintered molybdenum rod was cut into a 5mm thick disc sample, and the surface was polished on both sides by 240#, 400#, 600#, 800#, 1000# metallographic water sandpaper, and then ultrasonically cleaned with acetone for 15 minutes, and then cleaned with absolute ethanol After dehydration, dry at 60°C for 6 hours, so that the surface of the sample is smooth and flat, with a metallic luster, no oil, no rust and no obvious oxide layer.

[0037] (2) Mole fractions are 33% NaCl, 33% KCl, 14% NaF, 5% Na 2 SiF 6 and 15% Si were weighed and placed in an oven, dried at 105°C for 2 hours, ground into molten salt fine powder and mixed evenly. Pour the molten salt into a 50mL alumina crucible, then immerse the molybdenum sample treated in step (1) in the mixed molten salt contained in the crucible to ensure that the surface of the sample is in full contact with the molten salt, and place the quartz The rods were placed ve...

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Abstract

The invention discloses a molten salt non-electrolytic infiltration local treatment method for prolonging the service life of a tungsten cathode and a molybdenum cathode of a rare earth molten salt electrode. A non-infiltration area is protected through a titanium anti-infiltration clamp, and then a tungsten cathode material and a molybdenum cathode material for rare earth metal electrolysis are subjected to high-temperature diffusion infiltration in-situ reaction in neutral molten salt to prepare a metal silicide infiltration layer. The infiltration layer has the characteristics of molten salt thermal corrosion resistance and high-temperature oxidation resistance, so that the tungsten cathode and the molybdenum cathode are effectively inhibited from being rapidly subjected to thermal corrosion damage on the upper portion of the molten salt liquid level, and the service life of the cathodes is prolonged. The molten salt siliconizing protection technology has the advantages of being easy and convenient to operate, controllable in process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of tungsten and molybdenum cathode materials in the production of rare earth metals, and in particular relates to a partial treatment method of molten salt non-electrolytic infiltration for realizing the life extension of tungsten and molybdenum cathodes of rare earth molten salt electrodes, and performing molten salt siliconization on tungsten and molybdenum cathodes Prepared to improve hot corrosion resistance. Background technique [0002] Molten salt electrolysis is currently the most widely used method for producing a large amount of mixed rare earth metals, single light rare earth metals (except samarium) and rare earth alloys. This method is to heat and melt rare earth compounds such as rare earth oxides, rare earth chlorides, and rare earth fluorides as raw materials for electrolysis, use tungsten rods or molybdenum rods as cathodes, and graphite as anodes. process of rare earth metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/34C25C7/02
CPCC25C3/34C25C7/025Y02P10/20
Inventor 唐长斌俞永奇刘子龙崔段段陈红霞许妮君薛娟琴
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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