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TiB2-C composite cathode for aluminum electrolysis and preparation method thereof

A composite cathode and aluminum electrolysis technology, applied in the field of cathode materials for aluminum electrolysis, can solve the problems of uneven coating thickness, poor corrosion resistance to cryolite molten salt and aluminum liquid, shortened cathode life, etc., and achieve uniform and good material properties. Application effect, effect of avoiding oxidation phenomenon

Active Publication Date: 2014-03-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

However, the above-mentioned cathode materials more or less have the following deficiencies in the production and application process: such as poor wettability with molten aluminum, poor corrosion resistance to cryolite molten salt and molten aluminum, insufficient bonding with the matrix, Poor thermal shock resistance or uneven thermal expansion coefficient, especially TiB 2 Cathode coating technology is the most wettable cathode material technology applied and researched at present, but the bonding performance between the coating and the substrate material has not reached the ideal state during the production and application process, thus restricting the widespread promotion of this technology application
The roasting method also uses the traditional aluminum electrolytic cell roasting start-up mode to roast the coating material, which cannot achieve a good TiB 2 Carbonization and sintering effect of / C composite material
And the technology described in it is only applied to the aluminum electrolytic cell with a single conductive surface of the traditional upper and lower structure, and cannot be applied to the new high-efficiency green aluminum electrolytic cell
In conclusion, coating TiB by brush method 2 There are certain deficiencies in the technical construction of / C composite materials, such as: (1) low productivity and high labor intensity; (2) the uniformity of coating thickness is not suitable for control, and the surface is rough and uneven; (3) the bonding between the coating and the substrate Low strength, easy to fall off; (4) The thickness of the coating is uneven, the thickness is too thin to shorten the life of the cathode, and the coating is too thick, which will lead to cracking after sintering, and it will be greatly affected by thermal shock when the electrolytic cell is fired and started. Uneven stress, which eventually leads to early peeling off of the coating

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  • TiB2-C composite cathode for aluminum electrolysis and preparation method thereof

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Experimental program
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Embodiment 1

[0045] A) First, 50wt% of titanium boride powder with a particle size of 3-10μm, 20wt% of artificial graphite with a particle size of 60-150μm, 1.1wt% of graphitized mesocarbon microspheres with a particle size of 10-15μm, and a particle size of 50-100μm carbon fiber powder 1wt%, 3-5mm graphitized carbon fiber 2wt%, furan resin with a viscosity-average molecular weight of 4000-6000 3wt%; E-44 epoxy resin 3wt%, particle size 75-150μm modification 2.5wt% asphalt, 18wt% mixed solvent, 0.25wt% p-toluenesulfonic acid, and 0.15wt% liquid curing agent are weighed in proportion, added to a mixer and kneaded. The kneading temperature is 15°C, and the relative humidity in the air is 30%. The time is 6h, and the desired slurry is obtained. The mixed solvent is prepared from butyl acetate, absolute ethanol and butanone in a volume ratio of 4:3:20; the liquid curing agent is prepared from sulfuric acid, phosphoric acid and ethanol in a volume ratio of 10:3:25 . Such as figure 1 As shown...

Embodiment 2

[0055] First, 40wt% of titanium boride powder with a particle size of 3-10μm, 18wt% of artificial graphite with a particle size of 60-150μm, 3wt% of graphitized mesocarbon microspheres with a particle size of 10-15μm, and a particle size of 50-100μm 3wt% of carbon fiber powder, 3wt% of graphitized carbon fiber of 3-5mm, 3.5wt% of furan resin with a viscosity average molecular weight of 4000-6000; 3.5wt% of E-44 epoxy resin, modified pitch with a particle size of 75-150μm 3wt%, mixed solvent 22wt%, p-toluenesulfonic acid 0.4wt%, and liquid curing agent 0.6wt% were weighed in proportion, added to the mixer and kneaded and stirred. The kneading temperature was 28 ° C, the relative humidity in the air was 50%, and the kneading time was 3h, obtain required slurry;

[0056] Use a drilling tool to drill a through hole on the two opposite conductive surfaces of the carbon block of the all-graphite matrix, the hole diameter is 8mm, and the center distance of the hole is 12mm; inject th...

Embodiment 3

[0063] First, 44wt% of titanium boride powder with a particle size of 3-10μm, 13wt% of artificial graphite with a particle size of 60-150μm, 2wt% of graphitized mesocarbon microspheres with a particle size of 10-15μm, and a particle size of 50-100μm 2wt% of carbon fiber powder, 4wt% of graphitized carbon fiber of 3-5mm, 6wt% of furan resin with a viscosity average molecular weight of 4000-6000; 3wt% of E-44 epoxy resin, 4wt% of modified pitch with a particle size of 75-150μm , mixed solvent 20wt%, p-toluenesulfonic acid 1wt%, and liquid curing agent 1wt% were weighed in proportion, added to a mixer and kneaded and stirred. The kneading temperature was 35 ° C, the relative humidity in the air was 70%, and the kneading time was 6 hours. need slurry;

[0064] Use a drilling tool to drill a through hole on the two opposite conductive surfaces of the carbon block of the all-graphite matrix, the hole diameter is 6mm, and the distance between the holes is 10mm; inject the above slurr...

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Abstract

The invention provides a TiB2-C composite cathode for aluminum electrolysis and a preparation method thereof. The TiB2-C composite cathode comprises a full-graphite carbon block or a graphitized cathode carbon block for aluminum electrolysis, wherein holes are formed in a conductive face of the carbon block, and TiB2-C composite cathode materials are arranged in the holes. A plurality of TiB2-C composite materials penetrating through the interior of a base body have good wetting properties with aluminum liquid, then, during electrolysis, aluminum liquid films are firstly formed at conductive poles of the wettable TiB2-C composite material, then, a continuous aluminum liquid film face is formed by a plurality of points, a whole cathode conductive face is covered, and then, a layer of uniform and firm aluminum liquid film is formed on a whole cathode surface, so that the problem of the wetting of the aluminum liquid and a cathode material is solved thoroughly, the condition that an inert wettable cathode can have a stable cathodic reaction interface in various novel aluminum electrolysis tanks is ensured, the real wetting of the aluminum liquid and the cathode is realized, conditions for realizing the low-polar-distance production of aluminum electrolysis are provided, and meanwhile, the problems that a TiB2 composite coating cathode is short in technical service life and easy in falling off are solved.

Description

technical field [0001] The invention relates to cathode materials for aluminum electrolysis, in particular to TiB with a new structure for aluminum electrolysis 2 -C composite cathode and its preparation method. Background technique [0002] The current aluminum electrolysis technology has always used carbon material as the cathode material of the aluminum electrolytic cell. Due to the extremely poor wettability between the metal aluminum liquid and the surface of the carbon cathode material, a certain thickness of aluminum liquid must be kept in the current electrolytic cell to avoid the carbon cathode. Electrode reactions caused by exposure of the surface to the electrolyte are unstable. The thickness of the aluminum liquid in the current aluminum electrolytic cell is usually about 20cm. Such a thick aluminum liquid will fluctuate under the action of electromagnetic force, which will deform the interface between the aluminum liquid and the electrolyte. Aluminum fluct...

Claims

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Application Information

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IPC IPC(8): C25C3/08B22F1/00B22F7/08B22F3/22
Inventor 张艳伟杨建红李庆余张刚赵欣郑达张朝晖
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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