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Titanium boride cathode material for aluminium electrolysis and preparation method thereof

A cathode material, titanium boride technology, which is applied in the field of titanium boride cathode materials for aluminum electrolysis and its preparation, can solve the problems of limited pressure, expensive production and processing costs, large-scale, and design defects of special-shaped structures, and achieve conductivity High, good wetting performance

Active Publication Date: 2010-11-03
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiB obtained by coating coating technology 2 -C cathodes often require an electric oven to cure the coating, and brush or brush TiB with a soft bristle roller 2 coating, on TiB 2 Coating exerts limited pressure, resulting in TiB 2 The wettability of the paint to the cathode carbon lining of the aluminum electrolytic cell is not ideal, and the effect of complete wetting cannot be achieved, so that the TiB 2 The coating is not firmly bonded to the carbon cathode
TiB obtained by vibration forming technology 2 -C surface composite cathode is a heterogeneous material and can only achieve TiB 2 The mechanical combination of the functional layer and the carbon matrix layer, and the TiB 2 There are different degrees of problems in the bonding strength, corrosion resistance, wear resistance, and wettability of the aluminum liquid, and because of this type of vibration forming TiB 2 -C composite cathode is a heterogeneous material, and only one side of the cathode is rich in TiB 2 layer, unable to meet the needs of the aluminum electrolysis process
TiB prepared by hot pressing 2 Although the / C composite cathode material can basically meet the technical requirements of the high-efficiency green new aluminum electrolysis process, due to its extremely expensive production and processing costs, and the technology has obvious defects in the realization of large-scale materials and special-shaped structure design, it cannot be used. Realize large-scale production

Method used

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  • Titanium boride cathode material for aluminium electrolysis and preparation method thereof
  • Titanium boride cathode material for aluminium electrolysis and preparation method thereof

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Effect test

Embodiment 1

[0029] 60wt.% of commercially pure TiB with an average particle size of 1 μm 2 Powder, 6wt.% TiC particles with an average particle size of 1-2 mm, 20wt.% artificial graphite powder with an average particle size of 1 μm, 5wt.% modified pitch, 2wt.% E-44 epoxy resin, 2wt.% Carbon fiber powder with an average particle size of 50 μm and 5wt.% furan resin were placed in a kneading pot, kneaded and stirred at 55°C for 2h in acetone medium containing 3wt.%, then dried at 60°C for 24h, and used under a pressure of 100MPa Bidirectional compression molding to obtain TiB 2-C composite material green body, the green body is placed in an electric furnace, and the carbon powder is used to degrease in an inert protective atmosphere (Ar). The degreasing temperature is 1000 ° C, the degreasing time is 100 h, and the oxygen content in the atmosphere is 50ppm; then under the protection of high-purity Ar, the temperature was raised to 1400℃ at a rate of 50℃ / h for sintering, the holding time was...

Embodiment 2

[0031] 55wt.% of commercially pure TiB with an average particle size of 1 μm 2 Powder, 5wt.% of industrial pure TiB with an average particle size of 10mm 2 Particles, 10wt.% natural flake graphite powder with an average particle size of 100 μm, 20wt.% modified pitch, 2wt.% carbon fiber with an average particle size of 1-2 mm, 0.8wt.% carbon fiber powder with an average particle size of 150 μm, 5wt.% furan resin and 2.2wt.% phenolic resin were placed in a kneading pot, kneaded and stirred in a medium containing 3.5wt.% alcohol at 60°C for 4h, then dried at 80°C for 24h, and formed by vibration at 80MPa get TiB 2 -C composite material green body, the green body is placed in an electric furnace, and the carbon powder is used to degrease in an inert protective atmosphere (Ar). The degreasing temperature is 800 ° C, the degreasing time is 40 h, and the oxygen content in the atmosphere is 10ppm; then under the protection of high-purity Ar, the temperature was raised to 1200℃ at a ...

Embodiment 3

[0033] 70wt.% of commercially pure TiB with an average particle size of 1 μm 2 Powder, 5wt.% of industrial pure TiB with an average particle size of 5mm 2 Particles, 2wt.% TiC particles with an average particle size of 1-2mm, 6.4wt.% natural flake graphite powder with an average particle size of 10μm, 5wt.% modified pitch, 10wt.% petroleum coke, 1.6wt.% average particle size Carbon fiber powder with a diameter of 50 μm is placed in a kneading pot, kneaded at 50°C for 2 hours in a medium containing 3wt.% acetone, and then heated to 150°C and kneaded for 2 hours. Dry for 24 hours, and use vibration molding under 200MPa pressure to obtain TiB 2 -C composite material green body, the green body is placed in an electric furnace, and the carbon powder is used to degrease in an inert protective atmosphere (Ar). The degreasing temperature is 1000 ° C, the degreasing time is 80 h, and the oxygen content in the atmosphere is 10ppm; then under the protection of high-purity Ar, the tempe...

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Abstract

The invention discloses a titanium boride cathode material for aluminium electrolysis and a preparation method thereof and relates to a formula of an inert wettable cathode material for the aluminium electrolysis and the preparation method of the material. The titanium boride cathode material for aluminium electrolysis and the preparation method thereof are characterized in that: the cathode material comprises titanium diboride (TiB2), graphite, a high-temperature binding agent M and a reinforcing agent X. The preparation process comprises the following steps of: (1) mixing materials, namely, mixing, kneading and stirring the TiB2, graphite powder C, the high-temperature binding agent M and the reinforcing agent X according to theoretical ingredient volume and drying the mixture; (2) forming and degreasing, namely, performing pressure forming on the mixed raw materials to obtain green bodies and degreasing the green bodies under inert atmosphere; and (3) sintering, namely, sintering the degreased green bodies under the protective inert atmosphere or vacuum. A TiB2-C composite material for the aluminium electrolysis cell has the advantages of high wettability with aluminium liquid, high conductivity and high wear resistance, the realization of the sintering densification of the material and the homogeneous forming of the TiB2-C cathode material under the condition of normal pressure and low temperature, and the manufacturing cost which is far lower than that of a hot-pressing process.

Description

technical field [0001] A titanium boride cathode material for aluminum electrolysis and a preparation method thereof, relating to a formula of an inert wettable cathode material for aluminum electrolysis and a preparation method thereof. Background technique [0002] In the current aluminum electrolysis industry, the cathode must not only conduct electricity, but also withstand the physical and chemical corrosion of high-temperature molten salt. Therefore, the quality of the cathode material directly affects the service life of the electrolytic cell. The cathode of the current aluminum electrolytic cell generally adopts ordinary carbon block, semi-graphitic or graphitized products, but its main disadvantage is that it has poor wettability to aluminum liquid and is easily eroded by electrolyte melt, especially sodium salt, which promotes carbon The volume expansion and cracking of the cathode lead to early damage to the electrolytic cell. At the same time, the precipitate for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
Inventor 张刚杨建红李旺兴李庆余黄有国
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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