Titanium boride cathode coating paste for aluminum electrolysis, preparation method and coating method thereof

A cathode coating and titanium boride technology, which is applied in the field of cathode coating slurry for aluminum electrolysis, can solve the problems of uneven coating thickness, large thermal shock influence, uneven thermal stress, etc., and achieve smooth surface and high coating thickness. Thin, to avoid the effect of early shedding

Inactive Publication Date: 2010-12-15
GUANGXI NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain deficiencies in the construction of the brush coating method, such as: (1) low productivity and high labor intensity; (2) uneven coating thickness, rough and uneven surface; (3) thick brush coating, which makes When the electrolytic cell is energized and fired, it is greatly affected by thermal shock, and the thermal stress is uneven, which eventually leads to early peeling off of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Formula of titanium boride cathode coating slurry for aluminum electrolysis

[0051] The cathode coating slurry is composed of the following components by mass percentage:

[0052] Titanium boride powder with a particle size of 3-5 μm, 30%;

[0053] Artificial graphite with a particle size of 10-50 μm, 1%;

[0054]Graphitized mesocarbon microspheres with a particle size of 10-15 μm, 3.5%;

[0055] Cathode chips for electrolytic aluminum with a particle size of 45-100 μm, 1.5%;

[0056] Carbon fiber powder with a particle size of 50-100 μm, 0.8%;

[0057] Furan resin with a viscosity average molecular weight of 4000-5000, 4.5%;

[0058] Epoxy resin E-44, 2.5%;

[0059] Coal tar, 0.5%;

[0060] High-temperature asphalt with a particle size of 75-100 μm, 2.5%;

[0061] Mixed solvent, 51.3% (prepared from butyl acetate, absolute ethanol and acetone by volume ratio = 44:30:20);

[0062] p-toluenesulfonic acid, 1%;

[0063] Liquid curing agent, 0.15%;

[0064] D...

Embodiment 2

[0077] (1) Formula of titanium boride cathode coating slurry for aluminum electrolysis

[0078] The cathode coating slurry is composed of the following components by mass percentage:

[0079] Titanium boride powder with a particle size of 5-10 μm, 25.65%;

[0080] Artificial graphite with a particle size of 100-150 μm, 3.5%;

[0081] Graphitized mesocarbon microspheres 10-13μm 1.0%;

[0082] Cathode chips for electrolytic aluminum with a particle size of 100-150 μm, 2%;

[0083] Carbon fiber powder with a particle size of 100-150 μm, 0.5%;

[0084] Furan resin with a viscosity average molecular weight of 5000-6000, 4.0%;

[0085] Epoxy resin E-44, 3%;

[0086] Coal tar, 1.25%;

[0087] High-temperature asphalt with a particle size of 100-150 μm, 4%;

[0088] Mixed solvent, 54% (prepared from butyl acetate, absolute ethanol and acetone by volume ratio=44:30:20);

[0089] p-toluenesulfonic acid, 0.4%;

[0090] Liquid curing agent, 0.3% (prepared from sulfuric acid, phos...

Embodiment 3

[0103] (1) Formula of titanium boride cathode coating slurry for aluminum electrolysis

[0104] The cathode coating slurry is composed of the following components by mass percentage:

[0105] Titanium boride powder with a particle size of 4-10 μm, 15%;

[0106] Artificial graphite with a particle size of 10-70 μm, 4.5%;

[0107] Graphitized mesophase carbon microspheres 12~15μm, 7%

[0108] Cathode chips for electrolytic aluminum with a particle size of 80-150 μm, 2.25%;

[0109] Carbon fiber powder with a particle size of 70-90 μm, 0.5%;

[0110] Furan resin with a viscosity average molecular weight of 4000-6000, 7%;

[0111] Epoxy resin E-44, 2.5%;

[0112] Coal tar, 1%;

[0113] High-temperature asphalt with a particle size of 75-120 μm, 3%;

[0114] Mixed solvent, 55.1% (prepared from butyl acetate, absolute ethanol and acetone by volume ratio = 44:30:20);

[0115] p-toluenesulfonic acid, 0.25%;

[0116] Liquid curing agent, 0.9% (prepared from sulfuric acid, phos...

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Abstract

The invention provides a titanium boride cathode coating paste for aluminum electrolysis, a preparation method and a coating method thereof. A coating paste with uniform and stable solid-liquid dispersion, which is suitable for air spraying and has viscosity of between 16 and 35s, is finally formed by optimizing a formula of the titanium boride cathode coating paste for the aluminum electrolysis and adjusting the composition structure. The cathode coating paste prepared by the preparation method can be sprayed by using an air spraying construction process; the process has the advantages of simple operation, uniform thickness and smooth surface of the coating prepared by the spraying, low labor intensity for the construction and high efficiency; the curing, roasting and heating of the coating conform to the roasting and heating conditions of an aluminum electrolysis cell and special roasting equipment and roasting process are not needed in the actual production and application, so the cost can be saved; in addition, the coating obtained by spraying has thickness of between 0.2 and 0.6mm, so the coating has high thermal shock resistance, prevents early falling of the coating, has high resistance against the corrosion of the aluminum liquid and electrolyte and has high wettability with the aluminum liquid.

Description

technical field [0001] The invention relates to a cathode coating slurry for aluminum electrolysis, in particular to a titanium boride cathode coating slurry for aluminum electrolysis; the invention also relates to a preparation method of the cathode coating slurry and a coating method thereof. Background technique [0002] TiB 2 (Titanium boride, the same below) has become the first choice material for the manufacture of wettable and inert cathodes for aluminum electrolysis because it can be completely wetted with aluminum liquid and has excellent electrical conductivity. At present, the wettable cathodes used in aluminum electrolysis production are mainly resin TiB 2 Coated cathode. Known Resin TiB 2 The cathodic coating paste formulation mainly includes powdered TiB 2 , thermosetting resins, curing agents and solvents, etc. For example, the Chinese invention patent with the publication number CN1443875 discloses a titanium boride coating formula for the cathode of an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
Inventor 李庆余王红强李旺兴张刚张艳伟杨建红乔佳方明
Owner GUANGXI NORMAL UNIV
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